The duration (i.e time) of the impact, given that the head impact was 1770 N is 0.005 s
How do I determine the duration (i.e time)?Impulse is defined as the change in momentum of an object. It is expressed as:
Impulse = change in momentum
Impulse = final momentum – Initial momentum
Impule = m(v - u)
Impulse = force × time
Impulse = Ft
Thus,
Ft = m(v - u)
Where
F is the force t is the timem is the massu is the initial velocityv is the final velocityNow, we can obtain the duration (i.e time) of the impact. Details below:
Force (F) = 1770 NInitial velocity = 2.09 m/sMass (m) = 4.12 KgFinal velocity = 0 m/sDuration (t) =?Ft = m(v + u) since the collision came to a stop
1770 × t = 4.12 × (0 + 2.09)
1770 × t = 4.12 × 2.09
Divide both sides by 1770
t = (4.12 × 2.09) / 1770
t = 0.005 s
Thus, the duration is 0.005 s
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QUESTION 3
Explain how a solution is a special type of mixture.
Answer:
A solution is a homogeneous mixture in which the components are dissolved uniformly. The components of a solution are solute and solvent.
Explanation:
Brainliest, Please!The coefficient of kinetic friction between an object and the surface upon which it is sliding is 0.40 the weight of the object is 4.2
The frictional force of an object is the product of the normal force and coefficient of kinetic friction. Here the frictional force acting on the object is 16.4 N.
What is frictional force?
Frictional force is a kind of force acting on a body to resist it from motion. Thus, the direction of the force will be in negative with the magnitude. Frictional force is the product of coefficient of friction and the normal force.
The normal force acting on the object of mass 4.2 Kg is N = mg
N = 4.2 Kg × 9.8 m/s² = 41.16 N
Frictional force = ц N
= 0.40 × 41.16 N
= 16.4 N.
Therefore, the frictional force acting between the surface of the object and the floor is 16.4 N
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Your question is incomplete. But your complete question probably was:
The coefficient of kinetic friction between an object and the surface upon which it is sliding is 0.40 the weight of the object is 4.2 kg. What is the frictional force of the object?
Baseballs aren’t especially bouncy. A baseball fired at 20 m/s
at a solid wall rebounds at 11 m/s. What fraction of the initial kinetic energy is transformed into thermal energy?
The fraction of the initial kinetic energy is transformed into thermal energy is 3/4.
What fraction of the initial kinetic energy is transformed into thermal energy?The fraction of the initial kinetic energy is transformed into thermal energy is calculated by applying the principle of conservation of energy as shown below.
Mathematically, this is given as;
ΔK.E = E
where;
ΔK.E is the change in kinetic energyE is the thermal energyE = K.Ef - K.Ei
where;
K.Ef is the final kinetic energyK.Ei is the initial kinetic energyE = (¹/₂mu² - ¹/₂mv²) / (¹/₂mu²)
where;
m is the mass of the baseballv is the final velocity of the baseballu is the initial velocity of the baseballE = (u² - v²) / (u²)
E = (20² - 10²) / (20²)
E = 0.75 = 3/4
Thus, the fraction of the initial kinetic energy is transformed into thermal energy is a function of the change in speed of the baseball.
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If you are running at 6m/s and decide at 2m/s². How long will take you to stop and how far will You go respectively while declaration
It will take 3 sec to stop at the distance of 9 m while declaration.
What is declaration?Deceleration was actually inversely related to acceleration. We know that acceleration means the speed at which the object is accelerating, and deceleration means the speed at which the object is decelerating. For example, when you brake while driving, deceleration is used to slow the vehicle. This is represented by -a. where a is the acceleration.
Time taken to stop:
-a = (v-u)/t
-2 = (0-6)/t
t = -6/2
t = 3 sec.
Distance travelled during this process:
v² = u² + 2as
Since, v =0
s = u²/2a
= (6×6)/(2×2)
= 9 m
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Place a fluid inside a sealed cylindrical container, then allow it to roll down an inclined plane under the influence of gravity five times. What do you think will happen to the speed of the container as you increase the temperature of the fluid by 10 degrees Fahrenheit each time?
The speed of the cylindrical container will increase as you increase the temperature of the fluid.
What is the speed of an object down inclined plane?
The speed of an object moving down an inclined plane is determined by applying Newton's second law of motion.
F(net) = ma
where;
F(net) is the net force on the objectm is the mass of the objecta is the acceleration of the objectThe net force on the object is determined by subtracting force of friction from the applied force and it is given as;
F(net) = F - Ff
F(net) = F - μmg
where;
μ is the coefficient of frictionm is the mass of the sealed cylindrical containerg is the acceleration due to gravityWhen the temperature of the fluid inside the sealed cylindrical container increases, the container becomes more light because the fluid will acquire more kinetic energy and kinetic frictional force resisting the motion of the container reduces and consequently the speed of the cylindrical container will increase.
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A 21 kg chair initially at rest on a horizontal floor requires a 71 N horizontal force to set it in motion.
Calculate the magnitude of the weight of the chair.
The magnitude of the weight of the 12 kg chair is 117.6 N
What is the weight of an object?The weight of an object is the magnitude of the force of gravity acting on an object.
The unit of the weight of an object is Newton, N.
The weight of an object is given mathematically as follows:
weight = m * g
where;
m is the mass of the object
g is the acceleration due to gravity = 9.8 m/s²
From the data provided, the weight of the chaur is calculated below.
The weight of the 12 kg chair will be:
weight= 12 * 9.8
Weight = 117.6 N
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please someone help its due soon
Answer:
it would be 80 would it not
Explanation:
The 40 is just the angle to the normal ray. just multiply it by two giving you 80
Please explain its answer = 0.79(17) or 79(.17)%
The efficiency of the electric kettle is 79.17%.
What is the efficiency of the electric kettle?
The efficiency of the electric kettle is the measure of how well the electric kettle converts the input energy into useful output energy.
Generally, efficiency of any device is the measure of the device ability to covert input energy into useful out energy or the percentage of the input energy being converted into useful out put energy.
Mathematically, the formula for efficiency of any device is given as;
E = (output energy / input energy) x 100%
Input energy of the electric kettle = 120,000 J
Out put energy of the electric kettle = 95,000 J
Efficiency of the electric kettle = (output energy / input energy) x 100%
Efficiency of the electric kettle = (95,000 / 120,000) x 100%
Efficiency of the electric kettle = 79.17 %
Thus, the efficiency of the electric kettle is a function of output energy and input energy.
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If you are running at 6m/s and decide at 2m/s². How long will take you to stop and how far will You go respectively while declaration
You will take 3 second to stop and you will go 9 meters far.
What is velocity?
The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
Given that:
Initial velocity: u = 6 m/s.
deceleration: a = 2 m/s^2.
Final velocity = 0 m/s.
We have to find: time: t = ? and distance travelled: s = ?
So, time taken to stop = v/a = 6/2 second = 3 second.
Distance travelled in this process: s = v^2/2a = (6×6)/(2×2) meter = 9 meter.
Hence, you will take 3 second to stop and you will go 9 meters far.
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A student drops a rock from a bridge to the water 12 m below. How many seconds does it take the rock to hit the water? How fast is the rock moving when it hits the water
Answer: 15.49m/s
If you could give me brainliest that would be a great help! Thanks!
-Dante
The rock takes 1.22 seconds to hit the water.
The rock is moving at 15 m/s when it hits the water.
We can use the following equations to solve for the time it takes the rock to hit the water (t) and the final velocity of the rock (v):
v = v₀ + at
where v₀ is the initial velocity of the rock (0 m/s), g is the acceleration due to gravity (9.8 m/s²), and h is the height of the bridge (12 m).
First, let's solve for the time it takes the rock to hit the water:
t = v - v₀ / g
t = 15 m/s - 0 m/s / 9.8 m/s²
t = 1.22 seconds
Now, let's solve for the final velocity of the rock:
v = v₀ + at
v = 0 m/s + 9.8 m/s² * 1.22 seconds
v = 15 m/s
Therefore, the rock takes 1.22 seconds to hit the water and is moving at 15 m/s when it hits the water.
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Suppose the charges attracting each other in the above situation have an equal magnitude. Find the charge.
The situation- Two-point charges are separated by 6 cm. The attractive force between them is 27 N. Find the force between them when they are separated by 18 cm. (Why can you solve this problem without knowing the magnitudes of the charges?) i got 6.75 if the answer is needed
The force between the two point charge when they are separated by 18 cm is 3 N
How do I determine the force when they are 18 cm apart?Coulomb's law states as follow:
F = Kq₁q₂ / r²
Cross multiply
Fr² = Kq₁q₂
Kq₁q₂ => constant
F₁r₁² = F₂r₂²
Where
F₁ and F₂ are the initial and new forcer₁ and r₂ are the initial and new distance apartWith the above formula, we can obtain the force between the two point charge when they are 18 cm apart. Details below:
Initial distance apart (r₁) = 6 cmInitial force of attraction (F₁) = 27 NNew distance apart (r₂) = 18 cmNew force of attraction (F₂) =?F₁r₁² = F₂r₂²
27 × 6² = F₂ × 18²
972 = F₂ × 324
Divide both side by 324
F₂ = 927 / 324
F₂ = 3 N
Thus, the force when they are 18 cm apart is 3 N
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Part A
Find the water pressure at the bottom of the 54-m-high water tower in the following figure.
Express your answer to two significant figures and include the appropriate units.
Incorrect; Try Again; 5 attempts remaining
Enter your answer with a different unit type. Review a list of acceptable units.
The water pressure at the bottom of the 54-m-high water tower is
0.53 M Pa0.53 M N/m²How to calculate the pressure of waterpressure of water at a certain depth is calculated using the formula
Pressure, P = height * density * acceleration due to gravity
density of water is given by = 1000 kg/m³
acceleration due to gravity is given by = 9.82 m/s²
the given height, at the bottom of the 54-m-high water tower = 54 m
Pressure = 1000 kg/m³ * 9.82 m/s² * 54 m
Pressure = 530280 N/m²
Pressure = 0.53 M N/m²
Pressure = 0.53 M Pa
The pressure at the bottom of the 54-m-high water tower is 0.53 MPa
The unit of pressure used here is Pa which is equal to N/m² other unit include pound - force foot
1 N/m² = 0.73756 pound-force foot
530280 N/m² = 530280 * 0.73756 = 391113.32 pound-force foot
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HALP I NEED THE ANSWER!!!! Move on to electric force. Blow up the two balloons and knot them. Then tie a thread onto each balloon. Suspend the two balloons using tape so that they’re about six inches apart, and check that they don’t move or interact. Rub both balloons with wool or fur. If wool or fur is not available, rub the balloons on your hair. Do they attract or repel (push away) each other?
Answer:
Attract
Explanation:
The balloons attract each other due to electrons.
Hope this helps :)
Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of the ultrasound waves themselves. What is the size of the smallest feature observable in human tissue when examined with 12-MHz ultrasound? The speed of sound in a human tissue is 1,540 m/s.
The size of the smallest human feature that can be seen is 1.28 * 10^-4 m.
What is the size of the smallest feature ?We know that ultrasound is used in the observation of the human tissues. In most cases, the ultrasound can be used to "see" the fetus that is still in the womb in addition to a lot of other things that the ultra sound can be used to do in the human system.
Given that;
v = λf
v = speed of the wave
λ = wavelength of the wave
f = frequency of the wave
Thus;
λ = v/f
λ = 1540/12 * 10^6 Hz
λ = 1.28 * 10^-4 m
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3. A car’s efficiency is only 13 percent. a. If the input work for a car is 200 joules, what is the output work? b. List two things that car manufacturers do to improve a car’s efficiency
The output work of the car is 26J. The efficiency of the car can be improved by
i. changing the car oil
Ii. replacing the air filters
What is efficiency of a machine?The efficiency of a machine indicates how well its input work is converted to useful output work or energy. It is a major factor in the usefulness of a machine and is the fraction or percentage of the output work divided by the input work.
efficiency = work output/work input ×100
13= (work output/200) ×100
13×200= work output×100
Therefore the work output = 2600/100= 26J
The efficiency of the car is low and can be increased in the following ways
i. changing the car oil
Ii. replacing the air filters
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Which of the position versus time graphs below matches the following description: a speed versus time graph has a horizontal line at 5 m/s from zero to five seconds?
The position versus time graph that matches the description: a speed versus time graph has a horizontal line at 5 m/s from zero to five seconds is Graph A; The correct option is A.
What is a position versus time graph?A position versus time graph is a graph that plots the position of an object against the time it takes for the object to move from one point to another.
The slope of a position versus time graph represents the speed or velocity of the object.
The slope of a position time graph = distance or position/time
A speed versus time graph is a graph that plots the speed of an object against the time it takes for the object to move to that speed.
The slope of a position versus time graph represents the acceleration of the object.
Considering the given speed versus time graphs:
Graph A: the speed versus time graph has a horizontal line at 5 m/s from zero to five seconds.
Graph B: the speed versus time graph shows variation is speed over time
Graph C: the speed versus time graph shows a constant increase in speed over time
Graph D; the speed versus time graph shows a constant decrease in speed over time
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A 230,000 V-rms power line carries an average power PAV = 250 MW a distance
of 200 km. If the total resistance of the cables is 10 ohms, what is the resistive
power loss?
a. 1.0 MW
b. 2.5 MW
c. 5.4 MW
d. 12 MW
e. 10 kW
The power loss over the given distance in which the current is carried is 12 MW.
option D is the correct answer.
What is the current carried in the power line?
The current carried in the power line is calculated by applying Ohms law as follows;
V = IR
P = IV
I = P/V
where;
P is the average power of the lineV is the voltageI is the currentI = (250 x 10⁶) / (230,000)
I = 1,086.96 A
The power loss over the given distance in which the current is carried is calculated as;
P = I²R
where;
R is the resistance of the wireP = (1,086.96²) x 10
P = 11.8 x 10⁶ W
P ≈ 12 x 10⁶ W
P = 12 MW
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Question 4 of 25
A person drops two objects from the same height. One object weighs 15 N,
and the other weighs 10 N. How does the mass of the objects relate to the
force of gravity on them?
A. The 15 N object has twice the mass of the 10 N object.
B. The 15 N object has more mass than the 10 N object.
C. The 10 N object has more mass than the 15 N object.
D. The 10 N object has the same mass as the 15 N object.
Students pulled the same mass up an inclined plane that was 20 cm, 30 cm, and 40 cm long.
Each time, they measured the force needed to pull the mass up the inclined plane. What did
they conclude?
20 cm
30 cm
40 cm
They can conclude that: force needed to pull the mass up the inclined plane is not same and they are:
force needed in 20 cm path > force needed in 30 cm path > force needed in 40 cm path.
What is force?An object's push or pull is seen as exerting a force. The interaction of the objects produces push and pull. You can also use words like stretch and squeeze to describe force.
The definition of force in physics is: The push or pull on a mass-containing item changes its velocity.
Let the mass be m.
To pulled the same mass up an inclined plane of angle θ, they have to work against gravitational force which is mgsinθ.
So for same height h:
force needed for 20 cm long inclined plane is = mgsinθ = mg(h/20).
force needed for 30 cm long inclined plane is = mgsinθ = mg(h/30).
force needed for 40 cm long inclined plane is = mgsinθ = mg(h/40).
So they can conclude that: force needed to pull the mass up the inclined plane is not same and they are:
force needed in 20 cm path > force needed in 30 cm path > force needed in 40 cm path.
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A pendulum has a length of 1m. What is the period of this pendulum? What is the frequency of this pendulum?
The period and frequency of the pendulum are equal to 2 sec and 0.5 Hz.
What is a simple pendulum?A simple pendulum can be defined as a mechanical arrangement that possesses periodic motion. The simple pendulum is made of a bob having mass suspended by a thin string hung at its upper end of the length.
The simple pendulum moves freely back and forth in an oscillatory motion and the motion of the pendulum occurs in a vertical plane which is operated by the gravitational force.
The relationship between the time period and length of the pendulum is given by:
T = 2π√(L/g)
Where 'g' is the acceleration due to gravity and 'L' is the length of the pendulum.
T = 1/f where is the frequency of the pendulum.
Given, the length of a pendulum, L = 1 m
Then the period of the pendulum can be calculated as:
[tex]T = 2\times 3.14 \sqrt{\frac{1}{9.8} }[/tex]
T = 2 s
The frequency of the pendulum, f = 1/T = 1/2 = 0.5 Hz
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find the hypotenuse of a right triangle if the perpendicular leg is 12 and the base is 5.
Earth’s gravitational field is 7.51 N/kg at the altitude of the space shuttle. What is the size of the force of attraction between a student of mass 53 kg and Earth? Answer in units of N.
Explanation:
395.53 N
The force of attraction between a student of mass 53 kg and Earth is calculated using the equation F = G*m1*m2/r^2, where G is the gravitational constant (7.51 N/kg), m1 is the mass of the student (53 kg), m2 is the mass of Earth, and r is the distance between them (the altitude of the space shuttle). Plugging in these values, we get F = 7.51*53*5.97e24/((6.37e6 + 6.37e6)^2) = 395.53 N.
Polaris is also called the North Star because Earth's North
Pole points toward it. As Earth rotates, other stars seem to
spin around Polaris in a counterclockwise direction. In one.
day, the stars will make one complete circle (360°) around
Polaris. Compare the positions of the constellations in the
two diagrams. Calculate how many hours have passed
between the first and second diagrams.
Answer:................
Explanation:.............
Anna Litical analyzes the force between a planet and its moon, varying the mass of the moon and the distance between the moon and the planet. Her data is shown below. Which force ranking is consistent with Anna's data?
Mmoon (kg)
6 x 10^22
6 x 10^22
3 x 10^22
d (km)
3500
7000
7000
Which is the correct answer:
Trial 3 is the largest, trial 2 is the smallest
Trial 1 is the largest, trial 2 is the smallest
Trial 3 is the largest, trial 1 is the smallest
Trial 1 is the largest, trial 3 is the smallest
Answer:
The answer is option D: trial 1 is the largest while trial 3 is the smallest.
Explanation:
Gravitational force is the attraction that exists between all objects at all times.
The force ranking, that is consistent with Anna's data, be Trial 1 is the largest, trial 3 is the smallest.
What is gravitational force?Newton's universal law of gravitation states that the force of attraction between any two bodies is inversely proportional to the square of the distance between them and directly proportional to the product of their masses.
In the data: trial 1 has largest mass of the moon and smallest distance between the planet and the moon. So, the gravitational force will be largest here. Trial 2 has both smallest mass of the moon and largest distance. Hence, according to definition of gravitational force, in this case force is the smallest.
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Explain how the energy from the sun is transferred to fossil fuel?
Answer:
Fossil fuels are energy sources that come directly from nature. First, the sun's radiant energy is stored as chemical energy in plants by photosynthesis. When the plants die, they start decaying. After many years, the plants are turned into fossil fuels.
Explanation:
Fossil fuels rely on the Sun's energy because the energy in fossil fuels came from plants and algae as they performed photosynthesis, which requires sunlight.
When sunlight strikes a plant, some of the energy is trapped through photosynthesis and is stored in chemical bonds as the plant grows.
(u should paraphrase it)
Suppose you need to design a parachute system to help a remote camera land safely at the bottom of a cave. The camera will drop from a height of one story. It has a mass of about 500 g. A carton of eggs inside a box will model the camera. For your test to be successful, none of the eggs can break when the box lands. You may use string, plastic bags, paper, and any fabrics you have to make a model parachute.
Identify the criteria and constraints. Describe your model and draw a picture of it. Describe how you could test your model and what you would do after the first test.
(pls make don't talk about high school)
The criteria for a successful parachute system are that it must be able to safely land the camera without breaking any of the eggs. The constraints are that the parachute must be made using only string, plastic bags, paper, and fabrics, and the camera must be modeled using a carton of eggs.
One possible model for the parachute system could be a square parachute made of paper or fabric, with strings attached to the corners of the parachute. The camera (represented by the carton of eggs) would be attached to the center of the parachute.
To test the model, we could drop the parachute and camera from a height of one story (or a similar height) and observe whether the eggs break upon landing. If the eggs do not break, the parachute system is considered successful.
After the first test, we could make changes to the design of the parachute (such as changing the shape or size, or adding more strings) and test it again to see if it performs better. We could continue making and testing different designs until we find a parachute system that meets the criteria and constraints.
Thermal Energy Unit Test
1.) In 1-2 sentences, describe the relationship between heat and thermal insulators.
2.)When thermal energy is applied to ice, the ice's temperature rises until O° C and then stays the same for a period of time. in
1-2 sentences, explain why this takes place.
please help i’ll mark as brainlist:)
Answer:
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy.
Explanation:
1. Thermal insulators doe not conduct heat. They are used to protect other materials from high temperatures. 2. The temperature of ice after 0 degree stay same for some period until the completion of phase transition from ice to water.
What is thermal energy ?1. Thermal energy is a form of energy generated by the temperature change in the body. The heat energy absorption by a body make its temperature increased. However, not all material are thermally conducting. The material which are resistant to heat is called thermal insulators.
Thus, thermal insulators does not pass heat energy through the material and it stays the same temperature inside. They are used to protect materials from high temperatures.
2. Ice melts at a temperature of 0 degree Celsius. When thermal energy is applied to ice the temperature of ice increases up to its melting point then remains same for some time. Because the energy absorbed is used for the phase transition and the temperature becomes constant until the transition completes.
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A cheetah can run from 0 to 70 mph in 2.2 seconds. How much distance did the cheetah cover in traveling from 0 to 70 mph?
The top speed of a cheetah in m/s is 31.29 m/s.
Given data:
The initial speed of a Cheetah is, u = 0 mph.
The final speed of the Cheetah is, v = 70 mph.
The time interval is t = 2.2 seconds.
We are already given with top speed of a Cheetah, and it’s none other than the final speed itself. Now we need to convert the mph value of top speed into m/s value.
We know that,
1 mph = 0.44704 m/s
So, the value of 70 mph in m/s is,
Thus, we can conclude that the top speed of a cheetah in m/s is 31.29 m/s.
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An object is accelerated 1.25 m/s2. What is the mass if the net force is 60 N?
PLS HELPPPPPPPPPPPP
The mass of the object is equal to 48 Kg if the net force is 60 N.
What is acceleration?Acceleration can be defined as the rate at which the object changes its velocity with respect to time. The acceleration is a vector parameter and can be expressed as the second derivative of position w.r.t. time.
The force acting is equal to the multiplication of the mass and acceleration according to Newton's second law of motion.
F = ma
And, a = F/m
Given, the net force acting on an object, F = 60 N
The object is accelerating at a rate, a = 1.25 m/s²
The mass of the object can be calculated by using the given information:
m = F/a
m = 60/1.25
m = 48 Kg
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The separation distance in B is_____ times greater than in A, the force of attraction is
than A.
The separation distance in B is a number times greater than in A, then the force of attraction in B is less than A.
What is the force of attraction between two object?
The force of attraction between two charged object is determined by applying Coulomb's law.
Coulomb's law states that the force of attraction or repulsion between two charged objects is directly proportional to the product of the charges and inversely proportional to the square of the distance between the charges.
Mathematically, this law is written as;
F = Kq₁q₂/r²
where;
k is Coulomb's constantFrom the formula given above, as the distance of separation increases, the magnitude of the force of attraction between the charges decreases. Also, as the distance of separation between the charges decreases, the magnitude of the force of attraction between the charges increases.
Thus, the magnitude of the force of attraction between charged objects is a function of the magnitude of the charges and distance of separation between the charges.
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