110 Answered Questions for the topic Energy

Does endo- and (or) exocytosis require energy? Do they belong to active / passive transport?

I expect vesicle formation and fusion to require energy input; however, I'm not sure about **_which of endocytosis and exocytosis require energy and how they use the energy input_**.Do they belong... more

06/28/19

Finding work done in an inclined plane

I'm trying to solve a textbook problem that says:A boy in a wheelchair (total mass 47.0 kg) has speed 1.40 m/s at the crest of a slope 2.60 m high and 12.4 m long. At the bottom of the slope his... more
Energy Physics

06/21/19

How much energy is lost due to friction?

Heights:Point A=65m, Point B=52 m, Point C=25mThe total mass of the roller coaster is 650 kg.In real life, some of the energy the roller coaster has at point A will be lost as thermal energy due... more
Energy Physics Work Power

06/21/19

Work, power and energy

Heights:Point A=65m, Point B=52 m, Point C=25mThe total mass of the roller coaster is 650 kg. a) If it takes a force of 2760 N [parallel to the track] to pull the roller coaster up to point A, and... more

06/07/19

what is kinetic energy?

04/02/19

Evidence that Attention Deficit Hyperactivity Disorder (ADHD) is caused by too much cellular ATP?

The question is pretty simple — it's just a theory that I remember my biology teacher mentioned long ago and for years now I've wondered about it without ever asking.Some people with attention... more

03/13/19

Do photons lose energy while travelling through space? Or why are planets closer to the sun warmer?

My train of thought was the following:The Earth orbiting the Sun is at times 5 million kilometers closer to it than others, but this is almost irrelevant to the seasons.Instead, the temperature... more

Hydrogen Emission Spectrum Lab

So I've recently did a hydrogen emission spectrum lab.   These were the four wavelengths I got:   Red         675 nm Green      570 nm Blue        460 nm Purple      425 nm   These are the... more

09/25/18

Photon's Energy: Chemistry

Calculate the energy (in J) of a photon emitted during a transition corresponding to the third line in the Lyman series (nf = 1) of the hydrogen emission spectrum. (Report your answer to three... more

08/29/18

When does the entropy usually increase?

Some of the answers are below, maybe you can help by answering which one's correct? A. Molecule broken into two or more. B. Reaction results in increasing in No. Of gas moles. C. solid changes... more

Which requires more work?

Two inclines have the same height and same coefficients of friction. However, incline A is much steeper than incline B. If two identical blocks were pushed up the ramp, which block requires more... more

05/14/18

Proving that a value does not decay in the process of motion

Hi   How do I go about proving that a value for energy does not decay during the process of motion?    Thanks    
Energy

05/08/18

Can mechanical energy be equal to gravitational potential energy

Can mechanical energy be equal to gravitational potential energy
Energy

04/19/18

How much energy in joules is needed?

The heat capacity of aluminum is 0.900J/g CHow much energy in joules is needed to raise the temperature of an 85 gram block of aluminum from 22.8 C to 96.4 C?

01/18/18

Physics Power and Work

A 49kg bicycle rider delivers an average of 0.28 hp. The mass of the bicycle is 2.1kg and the hill she is climbing is 245m tall. How much time will this take?

01/15/18

Energy of a covalent bond is approximated as: V (rij) =1/2 k [( rij-bij)]power2 Calculate the force acting on atoms as a function of interatomic distance.

Energy of a covalent bond is approximated as: Vb (rij) =1/2 kijb [( rij-bij)]2 Calculate the force acting on atoms as a function of interatomic distance.

neglecting friction what is the total mechanical energy of ball as it moves along the wooden plane?

Inclined wooden plane by 45º with repect to the table top by placing books under the other edge of the plane. the height of the top of the the wooden plane to the table is 23 cm and the height from... more

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

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

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
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?

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?

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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