123 Answered Questions for the topic Energy

01/12/18

what will be the temperature difference between the water at the top and the bottom of the falls?
A waterfalls is 90m high. Assume that all of the potential energy possessed by the water at the top is completely converted to heat energy. What will be the temperature difference between the water... more
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12/30/17

Physics Mechanical Energy and Friction
An asteroid with a mass of 5.0 x 105 kg collides with the Earth and slides horizontally along the ground without bouncing (not actually possible but just pretend). The velocity of the asteroid... more
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12/05/17

How do i use the energy equation to answer the question below?
A particle of mass m = 10kg moves along a straight line under the action of force F =λ/x4, where λ is some constant. A measurement shows that the particle passes the pointx = 1m with the velocity... more
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Energy

10/31/17

What is the final speed
A force of 3.7 N is exerted on a 105-gram hockey puck over a distance of 2 meters. If it was initially at rest, what is the final speed of the hockey puck?
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08/21/17

Energy in Simple Harmonic Motion help?
A .500 kg mass is oscillating on a spring with k= 330 N/m. The total energy of it's oscillation is 3.24 J. What is the speed of the mass when it is .100 m from the EP?
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08/21/17

Energy in Simple Harmonic Motion help?
A .150 kg mass is attached to a spring with k=18.9 N/m. At the equilibrium position, it moves 2.39 m/s. How mych mechanical energy does it have?
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Energy

08/14/17

C + O2 ⟶ CO2 Calculate the enthalpy for the equation above.
I  don't understand enthalpy? could someone help
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Energy

08/14/17

A reaction heats up 100.0 grams of water from 22.0 °C, to 29.0 °C. Water has a specific heat of 4.184. How much energy was absorbed?
could someone help?
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Energy

08/14/17

A reaction’s reactants possess 200.0 kJ of energy, and its products possess 250.0 kJ of energy. What type of reaction is this?
Help!!!! I don't understand
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07/30/17

Energy lost to heat
In an attempt for a physics teacher to explain the conservation of energy to a student, the teacher goes down a 6.0 m high sliding board. At the bottom, he only travels 7.0 m/s. If the mass of the... more
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06/28/17

Heat Equation
How much heat energy is required to completely change 25 grams of ice at 0 degree Celsius to water and raise the temperature to body temperature (37 degree Celsius)?
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03/18/17

Waves and energy
"When you speak to someone, the air molecules travel from your voice box into the person's ear, thus carrying the sound wave to them."   Is the above statement correct? Explain your... more
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Energy

02/03/17

How much weight x at 1 ft. high off the ground with gravity 32 ft./s squared would it take to produce 1 Kw hour of electricity
How much weight in pounds would it take to generate 1 Kw of electricity if the weight were suspended off the ground (Potential Energy) with the force of gravity pulling the weight downward turning... more
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Energy Efficiency

01/26/17

need help in this question
Imagine that you are working as a roller coaster designer. You want to build a record-breaking coaster thatgoes 70 m/sec at the bottom of the first hill. You estimate that the efficiency of the... more
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Energy Efficiency

01/26/17

need help in this question
A 1000 kilogram roller coaster goes down a hill that is 90 meters tall. Its speed at the bottom is 40 m/sec. a. What is the efficiency of the roller coaster? Assume it starts from rest at the top... more
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Energy Physics Work Power

12/05/16

Work energy Power doubt
An object of mass m, initially at rest under the action of a constant force F attains a velocity v in time t. Then the average power is supplied to mass is ?
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11/08/16

Red light has a longer wavelength than blue light. - Answer questions, Explain Please
Red light has a longer wavelength than blue light.   Which of these colors has the higher frequency?   Which of these colors has the higher energy?
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10/29/16

Amount of ATP generated from glucose metabolism in the liver and muscle tissue. Show working out. HOW?
Glucose can be metabolised through glycolysis, the citric acid cycle and oxidative phosphorylation to produce energy for the body in the form of ATP. Calculate the net number of ATP that can be... more
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10/26/16

CHEM CONFUSION! HELP WITH CALORIMETRY
So the question is....   How many Joules of energy will be needed to heat 128.0g of water 0.00 degrees Celsius to 283.08 degrees K.   I keep getting 5320 J while my friends say that it is... more
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10/20/16

Dynamics work and energy
why are there different formulas used for work-energy in dynamics?
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10/10/16

Temperature related doubts
if a refrigerator works between the temperature 4c &30c and 600 calories of heat is released then how to calculate work in joules ?
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09/17/16

Bungee jumping and energy transfers
On the sheet I have it shows a diagram of a bungee jumper at three different positions: waiting to jump (position 1), at E point where the bungee rope is fully unwound and about to start stretching... more
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08/28/16

State of Matter Change
State Change: Liquid to Solid. Name: Freezing. Energy: Less. Particle Motion: Slower. Heat: Released.   State Change: Gas to Liquid.    State Change: Gas to Solid.   State Change: Solid to... more
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Energy Work Power

08/07/16

What is the change in gravitational potential energy, in Joules?
A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of... more
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06/01/16

Fill in the Blank: Potential Energy
A 0.50-kg sphere at the top of an incline has a potential energy of 8.0 joules relative to the base of the incline. Rolling halfway down the incline will cause the sphere's potential energy to be... more
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