Answer:
- 0.25m/s²
Explanation:
Given parameters:
Initial velocity = 40m/s
Final velocity = 30m/s
Time taken = 40s
Unknown:
Acceleration of the car = ?
Solution:
Acceleration is the rate of change of velocity with time.
So;
Acceleration = [tex]\frac{Final velocity - Initial velocity }{time }[/tex]
Acceleration = [tex]\frac{30 - 40}{40}[/tex] = - 0.25m/s²
This implies that the car will decelerate at a rate of 0.25m/s²
Find the mass and show all the work please and show the answer. Thank you.
Answer:
75 kg.
Explanation:
From the question given above, the following data were obtained:
Kinetic energy (KE) = 937.5 J
Velocity (v) = 5 m/s
Mass (m) =?
Kinetic energy (KE), mass (m) and velocity (v) of an object are related according to the following equation:
KE = ½mv²
With the above formula, we can obtain the mass of the object as illustrated below:
Kinetic energy (KE) = 937.5 J
Velocity (v) = 5 m/s
Mass (m) =?
KE = ½mv²
937.5 = ½ × m × 5²
937.5 = ½ × m × 25
937.5 = m × 12.5
Divide both side by 12.5
m = 937.5 / 12.5
m = 75 Kg
Therefore, the mass of the object is 75 Kg.
An elephant kicks a 2.5 kg rock that is initially at rest. The
net force on the rock varies with time as shown below.
What is the rock's change in momentum between 0 ms
and 20 ms?
0.20Answer:
Explanation:
A force of 6.0 Newton’s is applied to a block at rest on a horizontal frictionless surface over a 7.0 meter span. How much energy is gained by the block.
Answer:
42J
Explanation:
Given parameters:
Force applied = 6N
Distance moved = 7m
Unknown:
Amount of energy gained by the block = ?
Solution:
The amount of energy gained by the block is the same as the work done on the block.
The work done is the force applied to move the block through a distance;
Energy gained = force x distance = 6 x 7 = 42J
Answering the following questions will help you to focus on the outcomes of these experiments:
How does the length to height ratio (the IMA) of trial 1 compare to trial 2?
Why is the actual mechanical advantage less than the ideal mechanical advantage in each of the trials?
If a machine was 100% efficient, how would the AMA compare to the IMA?
Write a summary paragraph discussing this experiment and the results. Use the following questions and topics to help guide the content of your paragraph.
According to your data, was your hypothesis correct? (Be sure to refer to your data when answering this question.)
Summarize the conclusions that you can draw from this experiment. Use the questions above to guide your ideas.
Summarize any difficulties or problems you had in performing the experiment that might have affected the results. Describe how you might change the procedure to avoid these problems.
Give at least three examples from everyday life where an inclined plane is used to reduce the effort force needed to accomplish a task.
Answer:
Answering the following questions will help you to focus on the outcomes of these experiments:
1.How does the length to height ratio (the IMA) of trial 1 compare to trial 2?
= Trial 1 is 5.09, and Trial 2 is 3.25. Trial 1 is higher because the height of the trial is less than trial 2.
2.Why is the actual mechanical advantage less than the ideal mechanical advantage in each of the trials?
= It is because the machine's ideal mechanical advantage reflects the increase or decrease in force that would have occurred without friction. It is always greater than the actual mechanical advantage because all machines have to overcome friction.
3.If a machine was 100% efficient, how would the AMA compare to the IMA?
= In any real machine, some of the efforts are used to overcome friction. Thus, the resistance force ratio to the effort (AMA) is less than the (IMA).
A frictionless machine would have an efficiency of 100%.
How Does Exercise Treat Depression?
Answer:
It can help take your mind off of it. and help you get outside and in the world.
Explanation:
How does an electrical field change when it interacts with an opposing field
Answer:
The electric field will exert a force that accelerates the charged particle. The electric field has a direction, positive to negative. ... If it is moving in the opposite direction it will decelerate. If a negative charge is moving in the same direction as the electric field vector the particle will decelerate.
Match each chemical name with the correct chemical formula.
Here are the formula choices:
A. S7O2
B. SO4
C. SO3
D. SO
E. S6O5
A soccer ball is kicked horizontally and rolled off of a 30 meter high cliff. The soccer ball was kicked with a velocity of 17m/s. How long did it take before the ball hit the ground? How far from the cliff did the ball land? (Make sure to include units.)
VERTICLE
Acceleration =
Distance =
Initial velocity=
Time=
HORIZONTAL
Distance=
Velocity=
Time=
Show your work when solving for time:
Show your work when solving for horizontal distance:
Answer:This will hopefully help. It took me a while so will you mark me brainliest? Thanks!
Explanation:
velocity=Vertical (y) info:
• y = -22.0 m
• viy = 0 m/s
• ay = -9.8 m/s2
distance=
acceleration=
time=
horizontal=Horizontal (x) info:
• x = 35 m
• vix = ?
• ax = 0 m/s2
Initial velocity=16.5 m/s
VOCAB:Horizontal motion is constant
velocity- motion
acceleration-increase in the rate or speed of something.
distance-Distance is a numerical measurement of how far apart objects or points are. In physics or everyday usage, distance may refer to a physical length or an estimation based on other criteria (e.g. "two counties over"). The distance from a point A to a point B is sometimes denoted as. .
time-a point of time as measured in hours and minutes past midnight or noon.
Explanation:
The soccer ball travels a horizontal distance of
33.9 m after being kicked with horizontal velocity of 18.8ms−1. Assuming air resistance is negligible.
Time of flight of the ball
t=Distance Speed=33.918.8s In the vertical direction kinematic equation is
height
h=ut+12gt2 Initial velocity uv=0, acceleration due to gravity g=9.81ms−2. Inserting various values we get h=0×33.918.8+12×9.81×(33.918.8)2⇒h=12×9.81×(33.918.8)2
⇒h=15.9m, rounded to 3 sig. figs
PLEASE HELP ME I AM BEGGING YOU :)) 15 POINTS
A student investigated the energy being transferred using the
joulemeter (J).
The reading on the joulemeter was always 20 J lower than the
calculated value.
Name the type of error in the investigation
What was the long-term effect of the Northwest Ordinance of 1787?
Answer:
Established a government for the Northwest Territory, outlined the process for admitting a new state to the Union, and guaranteed that newly created states would be equal to the original thirteen states
Explanation:
Goooogle, so I hope this helps somewhat
Also, isn't this a History question? You put physics lol
Tafu is working with subatomic particles in the physics lab. a positron is traveling in a straight line down the particle accelerator. tafu models its position with the function p(t)= t2 t â 1 where t>1. in the limit calculations below, if you need to use -â or â, enter -infinity or infinity. (a) calculate the limit
Answer:
Infinity
Explanation:
When you have a limit approaching infinity one method you can use is to remember that the highest power dominants all of the other ones so when we have (t^2)/t-1 like in your problem, we see that t^2 has the highest power of 2 so if that's going to infinity and it's not being divided by any powers higher than it will just be inifinity.
We have that for the Question, it can be said that in the limit calculations below, if you need to use -â or â, enter -infinity or infinity. the limit is
[tex]Lim_{t->\infty} p(t)= \infty[/tex]
From the question we are told
Tafu is working with subatomic particles in the physics lab. a positron is traveling in a straight line down the particle accelerator.tafu models its position with the function
p(t)= t2 t â 1 where t>1.
in the limit calculations below, if you need to use -â or â, enter -infinity or infinity.
(a) calculate the limit
Generally the equation for the Question is mathematically given as
[tex]p(t)=\frac{t^2}{t-1}\\\\Therefore\\\\For Lim_{\infty}\\\\We have\\\\ Lim_{t->\infty} p(t)= Lim_{t->\infty}\frac{t^2}{t-1}\\\\[/tex]
Since, the equivalent degree of numerator (t^2) is greater than that of the denominator
[tex]Lim_{t->\infty} p(t)= \infty[/tex]
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Why are force fields necessary to describe electric force? 0 A. Electric force acts at a distance. O B. Electric force can only attract objects. C. Electric force is a form of gravity. D. Electric force attracts two poles.
Answer:
A. Electric force acts at a distance.
Explanation:
"Electric force," just like gravitational force is a "non-contact force." This means that even at a distance, two objects with no physical contact will create movement with the help of electric force. This leads to the concept of "force fields or field force" that explains why a charge object alters the region surrounding it. Once an object enters the region, it immediately experiences its force. An example of this is holding out one's hand near a "Van de Graaff generator." The electric force compels the hair strands to stand up.
When a government pays ranchers to reduce the number of milk cows they have, it is known as a what ?
O Subsidy
O Tax Break
O Productivity Schedule
O Resource Cost
I say a subsidy because the government is controlling how many cows they have.
Answer:
Subsidy
Explanation:
When a government pays ranchers to reduce the number of milk cows they have, it is known as a subsidy.
Subsidy is an incentive given by a government in form of cash or raw materials in order to achieve a common goal.
It might be to increase production of certain commodities or phase out a particular product in the market.
The subsidy helps in paying part of the production costs
A suitcase with a mass of kg 2 has a weight of 18n on a particular planet. What is the acceleration due to gravity on that planet
Answer:
[tex]9\ \text{m/s}^2[/tex]
Explanation:
m = Mass of the object = 2 kg
W = Weight of the object = 18 N
g = Acceleration due to gravity
Weight of the an object is given by
[tex]W=mg[/tex]
[tex]\Rightarrow g=\dfrac{W}{m}[/tex]
[tex]\Rightarrow g=\dfrac{18}{2}[/tex]
[tex]\Rightarrow g=9\ \text{m/s}^2[/tex]
The acceleration due to gravity on that planet is [tex]9\ \text{m/s}^2[/tex].
Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes.
Answer:
food chain / web lol? was this a question?
A .5kg book sits on top of a student's desk which is 9m high. How
much gravitational potential energy does the book have as it sits on the desk?
Answer:
441J
Explanation:
Given parameters:
Mass of book = 5kg
Height = 9m
Unknown:
Gravitational potential energy = ?
Solution:
The gravitational potential energy of a body is the energy due to the position of the body.
It is given as:
Gravitational potential energy = mass x acceleration due to gravity x height
Gravitational potential energy = 5 x 9.8 x 9 = 441J
how to write it in second?
Answer:
like this
Explanation:
The state of matter with particles that are not attracted or tightly packed
and are not arranged in a regular pattern; zoom around to easily change
shape and volume *
a.gas
b.liquid
c.solid
It's none of the above hope this helps
Earth's rotation causes winds to veer to the west or to the east. This is known as the Coriolis effect.
Lesson 1.06
Question 5 options:
True
False
Earth's rotation and spherical shape cause winds to veer to the right (in the northern Hemisphere) or to the left (in the southern Hemisphere) of the direction they want to go. This is known as the Coriolis effect.
If you didn't know that you're on a rotating Earth, and you looked at the patterns of the winds, you'd think there's some kind of force that's making the airflow veer to the right or left of the direction it actually wants to go. This is known as the Coriolis force. It's a"pseudo force", because it doesn't really exist. It only LOOKS like it's there, because of the Earth's rotation and spherical shape..
The statement "Earth's rotation causes winds to veer to the west or to the east" is true about the Coriolis effect.
What is the Coriolis effect?Fluid materials such as wind and ocean currents take different directions depending on the hemisphere, this movement of deviation is called the Coriolis effect.
Characteristics of the Coriolis effectThe Coriolis effect occurs when masses of air or water move along terrestrial meridians, and their trajectory and speed are modified by it.The winds or ocean currents that move along a meridian are diverted by accelerating in the direction of rotation (east) if they go towards the poles or the opposite (west) if they go towards the equator.Therefore, we can conclude that the force that tends to deflect the trajectory of objects moving across the entire earth's surface is known as the Coriolis effect.
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light waves from the sun can travel trough outer space and reach the earth
Answer:
this is true
Explanation:
A cuboid has sides that are 0.2m, 0.4m and 0.7m. The mass of the cuboid is 0.5kg. Calculate the density.
Answer:
d= 0.93 kg/m3
Explanation:
density= mass/volume
mass is given
volume= 0.4*0.2*0.7
then fill in the figures
Which terms describe the purpose of antennas on devices that use radio waves?
transmit and receive
modify and amplify
amplify and receive
modify and transmit
Which terms describe the purpose of antennas on devices that use radio waves?
Answer:
transmit and receiveExplanation:
Hope it helps:)
#CarryOnLearning
Answer:
Transmit and receive (A)
Explanation:
On Edge
A crate is dragged up a ramp at constant speed. The work done on the system can be accounted for by:
- Eel
-Eg
-Ek
-Eint
-both Eg and Eint
Answer:
The work done on the system can be accounted for by;
Both [tex]E_g[/tex] and [tex]E_{int}[/tex]
Explanation:
The speed of the crate = Constant
Therefore, the acceleration of the crate = 0 m/s²
The net force applied to the crate, [tex]F_{NET}[/tex] = 0
Therefore, the force of with which the crate is pulled = The force resisting the upward motion of the crate
However, we have;
The force resisting the upward motion of the crate = The weight of the crate + The frictional resistance of the ramp due to the surface contact between the ramp and the crate
The work done on the system = The energy to balance the resisting force = The weight of the crate × The height the crate is raised + The heat generated as internal energy to the system
The weight of the crate × The height the crate is raised = Gravitational Potential Energy = [tex]E_g[/tex]
The heat generated as internal energy to the system = [tex]E_{int}[/tex]
Therefore;
The work done on the system = [tex]E_g[/tex] + [tex]E_{int}[/tex].
Food labels often indicate energy in joules and calories. A jar of jam contains 1030 kJ (245 kcal).
Check if that is correct.
Answer:
It is not correct.
The correct conversion is:
1030 KJ = 246.18 KCal.
Explanation:
To know if 1030 KJ is equivalent to 245 KCal, we shall convert 1030 kJ to kcal. This can be obtained as follow:
4.184 KJ = 1 KCal
Therefore,
1030 KJ = 1030 KJ × 1 KCal / 4.184 KJ
1030 KJ = 246.18 KCal.
Thus, 1030 KJ is equivalent to 246.18 KCal.
From the above calculation, we can see that:
1030 KJ ≠ 245 KCal
Rather,
1030 KJ = 246.18 KCal.
As a gas or liquid increases in heat, what direction will it naturally move?
Hello!
Answer:
When a gas gets hot it should go up because of the pressure.
Explanation:
Hope this helps!
The melting point of a substance is the same as its _____ point.
evaporation
sublimation
freezing
boiling
Answer:
Boiling point
Explanation:
Calculate the momentum of a boat with a mass of 95kg moving at 2m/Ss
Answer:
190 kg m/s
Explanation:
Momentum = Velocity × Mass
→ Substitute in values
2 × 95 = 190 kg m/s
The momentum of the boat of mass 95 Kg moving at 2 m/s will be 190 Kg m/s.
What is Momentum?Momentum is defined as the product of mass of velocity. Momentum is a vector quantity. Mathematically, we can write momentum as -
p = mv
It is also the measure of the impact force imparted by any moving object, when it comes in contact with some other body.
Given is a boat with a mass of 95 Kg moving at 2 m/s.
Mass [m] = 95 Kg
Velocity [v] = 2m/s
We can write the momentum as -
p = mv
Substituting values, we get -
Momentum [p] = 95 x 2 = 190 Kg m/s
p = 190 Kg m/s
Therefore, the momentum of the boat of mass 95 Kg moving at 2 m/s will be 190 Kg m/s.
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A boat travels north at a rate of 25.0 kilometers per hour (km/hr) relative to the current of the river. The current of the river moves south at a rate of 10.0 km/hr relative to the ground. What is the rate of motion of the boat relative to the ground?
Answer:yes
Explanation:yes
What is the downward pull on an object due to gravity?
mass
weight
acceleration
velocity
Answer:
Weight
Explanation:
WEIGHT - downward pull to the center of earth due to gravity
ACCELERATION - the rate of change of velocity
VELOCITY - rate of change if displacement in time
The major difference between the mass and weight is that mass of an object can never be zero but weight can be zero. The downward pull on an object due to gravity is called the weight. The correct option is B.
What is weight?The measure of the force of gravity acting on a body is defined as the weight. Actually weight is a force and its SI unit is Newton (N). The weight of an object depends on the mass and acceleration due to gravity.
The formula used to calculate the weight is:
w = mg
m = Mass of an object
g = Acceleration due to gravity
Weight is found to be a vector quantity. Because it has both magnitude and direction. It is directed towards the center of the earth or other gravity well.
When objects fall to the ground, it is the gravity which accelerates them. So the force of gravity which pulls the object downward is called the weight.
Thus the correct option is B.
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The ultrasound is reflected from the seafloor back to the submarine.
Use the correct answers below to complete the sentence.
A. Half
B. The same as
C. Twice
The total distance the ultrasound pulse travelled is......... the distance to the sea floor.
Answer: c
Explanation:
The total distance the ultrasound pulse travelled is, twice the distance of the sea floor
Because it went back and forth