Answer:
A 40 Watt bulbtransfers energy to light and heat at a rate of 40 Joules per second.
Explanation:
Prior Knowledge
1. What do a light bulb, a toaster, a radio, and a computer all have in common?
Answer:
They all have electrical currents
Answer:
They have electronic parts and currents
Compared with those who live in the lowlands, people who live in the Southeast highlands experience
Answer:
The territory of Scotland was divided into two parts -- the highlands and the lowlands.
Explanation:
The people living in places of high altitudes are called highlanders. These high altitude places are called high lands and places with low elevations or altitudes are called the low lands. There are many differences between the two places and people experiences different difficulties in these places.
Some of the differences are :
The life of the people living in high lands are much more tougher than those living in the low lands. The highlanders have to work more hard than lowlanders.
The agricultural activities are more flourished in the low lands than in the high lands.
The low lands are more populated and highly industrialized than the high lands. Iron and steel industry, metal working industry and agriculture are some of the main industries of lowlands. They are the land of the Scottish nation.
Based on the law of conservation of energy, which statement is correct?
Answer:
D. Energy in an isolated system remains constant
General Formulas and Concepts:
Physics
Law of Conservation of Energy - Energy is neither created or destroyedExplanation:
According to the Law of Conservation of Energy, it cannot be created or destroyed.
Therefore, we can eliminate choices A and B right off the bat.
We need to choose between C and D. We know that even though energy cannot be created or destroyed, it can be changed into a different form. Therefore, the correct answer is D.
A cheetah can run at instantaneous speeds of 64 km/hr or 17.8 m/sec. How much time does it take a cheetah to run 2 m? 0.1 seconds, 0.1 m/s, or 35.6 seconds
Answer:
0.1 seconds
Explanation:
The speed of the cheetah has been given as 64km/h
To convert it to m/sec = 64x10³/3600
This is what resulted into 17.8m/sec
We are required to calculate how much time this cheetah would take to run for 2meters.
To get this,
= 2/17.8
= 0.11235 seconds
This is approximately 0.1seconds. so 0.1sevonds is the time it would take it to run 2m
A car and driver weighing 5060N passes a sign stating "Bridge out 27.5 meters ahead." She slams on the brakes and the car decelerates at a constant rate of 14 m/s^2. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the work done stopping the car if the car just stops in time to avoid diving into the water?
Answer in units of J.
Answer:
198785.714286 Joules
Explanation:
[tex]W=f*d[/tex]
[tex]F=ma\\F=516.326530612*-14\\F=-7228.57142857 N\\[/tex]
To find work:
Now that the force and the distance are known, plug and chug:
[tex]W=f*d\\W=-7228.57142857*27.5\\W=-198785.714286J[/tex]
Note that the question is asking for the magnitude of work, so the negative can be discarded as it is a directional component.
So, your answer is
198785.714286 Joules
ANSEWR FOR BRAINLIEST
When lifting weights, technique and posture are less importance the than amount of weight you lift?
A. true
B. false
Answer:
B. False
Explanation:
Without good technique and posture you can end up getting injured.
lily can travel 60 miles in 1.5 hours. if her speed is reduced by 5 mph. how far can she travel in 3 hours?
Answer:
3 hours.
Explanation:
If speed is reduce of 5, then she drive at 35 mph.
so 35*3 = 105 miles in 3 hours.
Therefore, we get 3 hours.
Scuba divers use compressed oxygen gas to go diving. The oxygen's volume decreases as pressure is increased to fit more in an oxygen tank. What Gas Law is being applied in this situation?
Charles Law
Gay-Luassac's Law
Boyle's Law
Newton's Law
Which vector is the sum of vectors a and ?
b
а
O
A.
B.
C.
Answer:
i would say D.
Explanation:
The sum of the given vector is option B as it is showing proper magnitude and direction.
What is a vector?A Euclidean vector, also known as a geometric vector or spatial vector, is a geometric entity with magnitude (or length) as well as direction in arithmetic, physics, and engineering.
Vector algebra allows vectors to be added to other vectors.
Physical concentrations can be represented using vectors. Vectors are most frequently used in physics to represent displacement, velocity, and acceleration.
Vectors are arrows that represent an amalgamation of magnitude and direction.
The operation of combining two or more vectors into a vector sum is known as vector addition.
The rule for vector addition of two or more vectors is given by the so-called parallelogram law.
Thus, the correct option is B as it is having magnitude and direction.
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4. Why do you think people in south Louisiana specialize in seafood?
Answer:
gang
Explanation:
yupppp
how does the vertical component of a projectiles compare to the motion of vertical free fall when air resistance is neglected?
According to the law of conservation of mass, what is the mass of aluminum
oxide (Al2O3) formed in this reaction?
-
2A1 +
53.96 g
302
96.00 g
2A1203
?
A. 84.08 grams
B. 117.96 grams
C. 203.92 grams
D. 101.96 grams
D. 101.96 grams. Molar mass of Al2O3=2× Atomic mass of aluminium + 3× atomic mass of oxygen. =2×27+3×16=54+48=102g.
What happens when Al2O3 reacts?Sodium aluminate and water are produced when aluminum oxide Al 2 O 3 interacts with sodium hydroxide solution.Between 900 and 1100 ° C is the temperature at which this reaction occurs.Aluminum oxide functions as just an acid in this reaction.
How is Al2O3 produced from aluminum?Bauxite is the name of the aluminum ore (Al 2O 3).Bauxite is refined to create aluminum oxide, commonly known as alumina, which can be used to extract aluminum.Electrolysis is used to remove the metal, but first the aluminum oxide must be heated in order for electricity to flow through it.
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Answer: The CORRECT Answer is : 203.92 grams
Explanation: I took the test
An owl weighing 40N is sitting in a tree waiting to dive down to catch a mouse. If the owl's potential energy is 800 J with respect to the ground below, at what height above the ground is the owl?
h=PE/m
A. 81.63 m
B. 20 m
C. 2.04 m
Answer:
h = 20 m
Explanation:
Gravitational Potential Energy
Gravitational potential energy (GPE) is the energy stored in an object due to its vertical position or height in a gravitational field.
It can be calculated with the equation:
U=m.g.h
Where m is the mass of the object, h is the height with respect to a fixed reference, and g is the acceleration of gravity or [tex]9.8 m/s^2[/tex].
The weight of an object of mass m is:
W = m.g
Thus, the GPE is:
U=W.h
Solving for h:
[tex]\displaystyle h=\frac{U}{W}[/tex]
The weight of the owl is W=40 N and its GPE is U=800 J.
[tex]\displaystyle h=\frac{800}{40}=20[/tex]
h = 20 m
In which direction does the gravity of the earth act?
why do the satellite not fall while revolving around the earth.
Answer:
Satellites don't fall from the sky because they are orbiting Earth. Even when satellites are thousands of miles away, Earth's gravity still tugs on them. Gravity--combined with the satellite's momentum from its launch into space--cause the satellite go into orbit above Earth, instead of falling back down to the groundv
Explanation:
a boy claps his hand when he is 420m from the bottom of the cliff. he heard the eco after 2.4 second. what is the speed of sound
Answer:
350 m/s
Explanation:
In order for Boy to hear the sound, the sound has to travel from his hands to the cliff, and then BACK to him from the cliff to his ears.
So the sound has to travel (2 x 420m) = 840 m.
Speed = (distance) / (time)
Speed = (840 m) / (2.4 sec)
Speed = 350 m/s
Answer:
350 m/s
Explanation:
Which of the following is an example of a double replacement reaction?
A. 3Fe + 2O2 → Fe3O4
B. BaCl2 + K2CO3 → BaCO3 + 2KCl
C. NiCO3 → NiO + CO2
D. Cl2 + 2NaBr → 2NaCl + Br2
Answer:B
Explanation:please like this bc I just did it and got it right
14 An oil tank has a base of area 2.5 m2 and is filled with oil to a depth of 1.2m.
The density of the oil is 800 kg / m
What is the force exerted on the base of the tank due to the oil?
Answer:
F = 23544 [N]
Explanation:
To solve this problem we must use the following expression for static pressure in fluids.
[tex]P=Ro*g*h[/tex]
where:
P = pressure [Pa]
Ro = density = 800 [kg/m³]
g = gravity acceleration = 9.81 [m/s²]
h = depth = 1.2 [m]
Now replacing:
[tex]P = 800*9.81*1.2\\P=9417.6 [Pa][/tex]
And the pressure is defined as the relationship of force between the area.
[tex]P=F/A\\[/tex]
where:
F = force [N]
a = area = 2.5 [m²]
[tex]F = P*A\\F = 9417.6*2.5\\F = 23544 [N][/tex]
20.
All financial goals are long-term goals.
True
False
Answer:
Hello todays answer should be False i am sorry if i am incorrect-Lucy
Explanation:
Answer:
True
Explanation:
Because its facts
It will impact the rest of your career
A dolphin has a mass of 125 kg and is moving along with 775 J of kinetic energy. How fast is it moving? (Hint: use the formula to solve for KE)
Question 43 options:
12.4 m/s
3.52 m/s
0 m/s
6.2 m/s
Answer: 3.52m/s
Explanation:
Kinetic energy is calculated as:
= 1/2mv²
where,
m = mass
v = velocity
Therefore,
775 = 1/2 × 125 × v²
775 = 62.5v²
v² = 775/62.5
v² = 12.4
v = ✓12.4
v = 3.52m/s
Question 9 of 20
Which sentence best describes the function of an electric motor?
A. An electric motor uses electrical energy to produce magnetic
force.
B. An electric motor uses electrical energy to produce mechanical
energy
C. An electric motor uses mechanical energy to produce electrical
energy
D. An electric motor uses magnetic force to produce electrical
energy
Option B. An electric motor uses electrical energy to produce mechanical energy.
An electric motor is used to transform electric electricity into mechanical power. An electric-powered motor is an electrical device that converts electric energy into mechanical electricity.
Maximum electric-powered motors operate thru the interaction among the motor's magnetic field and electric-powered contemporary in a wire winding to generate force inside the form of torque implemented on the motor's shaft.
Electric motors are devices that convert electrical strength into mechanical power, commonly in the form of rotational motion. In easy terms, they may be devices that use electric powered power to generate reason strength.
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The electric force is a universal force that exists between any two charged objects What type of electric force exists between a
positively charged proton and a negatively charged electron?
A
an attractive force
B.
a repulsive force
C.
an attractive and a repulsive force
D
neither an attractive nor a repulsive force
If a net vertical force of 14.7 N is applied to a ball of mass 1.5 kg what acceleration
is produced?*
Answer:
9.8m/s^2
Explanation:
F=ma
F=14.7N
m=1.5kg
a=F/m
a=14.7N/1.5kg
a=9.8m/s^2
What is the mass of a box with a weight of 600 N ?
61.2 kg
600 kg
612 kg
200 kg
Answer:
A
Explanation:
F = m * a
F = 600 N
a = 9.81 m/s^2
600 = m * 9.81
m = 600 / 9.81
m = 61.2
A
Answer:
61.2 Kilograms
Explanation:
You take your Newtons(600) divided by the force of gravity (9.8 N) to get your mass (61.2Kg)
A planet orbits a star along an elliptical path from point X to point Y, as shown in the figure. In which of the following systems does the total mechanical energy
of the system remain constant?
A
The open system containing the planet
B
The open system containing the planet and the star
с
The closed system containing the planet
D
The closed system containing the planet and the star
Answer:
The correct answer is Option D, the closed system containing the planet and the star.
Explanation:
To start, we need to define mechanical energy: the energy an object has from its motion and position.
The fundamental principle in physics is that the total energy in a closed system stays constant, even if it transforms. By saying "closed system," we refer to a system isolated from its surroundings. Energy never leaves the system; it only moves from one part to another.
This statement only applies to closed systems, however. An open system that interacts with its environment works differently. Energy may enter and leave the system through interaction with external forces, and this includes mechanical energy. For this reason, Option A and Option B are incorrect.
The remaining two options, C and D, only vary with the objects in the closed system. Option D includes the star; Option C does not.
However, we should take a closer look at Option C. Can an object have potential energy with itself? No, it cannot. It only has potential energy with other bodies. If the system is defined as the planet only, the only type of energy present is kinetic energy. We know a planet orbiting a star has more kinetic energy near and more gravitational potential energy further from its star. Thus it has less kinetic energy further from its star and less mechanical energy. Because of this, Option C is incorrect.
The only answer left is Option D. If we define the planet and star as a closed system, we find no net external force acting on it. Consequently, it obeys the law of conservation of energy. From prior reasoning, we know mechanical energy includes potential energy and kinetic energy and that the amounts of these energies vary with its orbit. As a result, mechanical energy is always conserved and always the same. In the end, the correct answer is Option D.
In the closed system containing the planet and the star the given systems does the total mechanical energy of the system remain constant. Thus correct option of the given question is option D.
Mechanical energy-
Mechanical energy is the energy that is stored by a body because of its motion or its position. This energy can be rotational, transnational or rotational when it is in the moving position.
Energy conservation for an isolated system is a fundamental principle of physics, which states that total energy in a closed and isolated system is constant.
Open system-
An open system is a system that freely exchanges energy and matter with its surroundings. It means energy may enter or leave to this system.The system of star and planet shown in the graph do not fall under the open system as the matter does not transferred from it.Thus option A and B both are incorrect.
Closed system-
Closed system is the physical system in which the transfer of matter not allowed. The system of planet and star is the perfect example which obey the law of conservation of energy. In case of option C it does not include the star in the system. Thus only option D is correct option.
In the closed system containing the planet and the star the given systems does the total mechanical energy of the system remain constant. Thus correct option of the given question is option D.
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What compound is a product of photosynthesis?
Group of answer choices
Water
Carbon Dioxide
Glucose
Sunlight
Answer: Glucose
Explanation:
Your friend writes you a postcard describing a bird she saw while on vacation.
You start creating a picture in your mind of what the bird looks like. What
active reading strategy are you using?
A. Monitoring and applying fix-up strategies
B. Using visual cues and text features
C. Making mental images
D. Summarizing
Answer:
it should be C.
Explanation:
Visualizing refers to the ability to create mental pictures in our mind based on the text we read or words we hear. When we visualize, we are tapping into our prior knowledge, making connections, gathering information and paying attention to detail. It is one of many skills that make reading comprehension possible.
The static frictional force between a 95-kilogram object and the floor is 45 Newtons. The kinetic frictional force is only 22 Newtons. What force must be exerted to accelerate the box at 0.5 meters per second to the south?
Answer:
F = 69.5 [N]
Explanation:
We must remember that the friction force is defined as the product of the normal force by the coefficient of friction, and it can be calculated by the following expression.
[tex]f=N*miu[/tex]
where:
N = normal force [N]
miu = friction coefficient
f = friction force = 22 [N]
Now we must calculate the force exerted by means of Newton's second law which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
[tex]F - f = m*a[/tex]
where:
F = force exerted [N]
f = friction force [N]
m = mass = 95 [kg]
a = acceleration = 0.5 [m/s²]
Now replacing:
[tex]F - 22 = 95*0.5\\F = 47.5 + 22\\F = 69.5 [N][/tex]
define temperature
Answer:
temperature is the degree or intensity of heat present in a substance or object.
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A golf ball starts with an initial velocity of 100m/s and slows at a constant rate of -8m/s2, what is its final velocity after 2s?
Vf = Vi+at
A. 20 m/s
B. 84 m/s
C. 16 m/s
Answer:
Answer: B. 84 m/s
Explanation:
Uniform Speed Motion
It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time thus, the acceleration is constant.
Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the final speed is calculated as follows:
[tex]v_f=v_o+at[/tex]
The golf ball starts with an initial speed of 100 m/s and slows down at a=-8\ m/s^2. We are required to find the final speed at t=2 s:
[tex]v_f=100-8*2=100-16[/tex]
[tex]v_f=84\ m/s[/tex]
Answer: B. 84 m/s
What are the factors that influence the amount of elastic energy in an object