92 Answered Questions for the topic Energy

3d

A jet of mass 4,277 kg lands on an airstrip, stopping after a distance of 727 m and has an initial landing speed of 29 m/s.

What is the work done, in Joules, by non-conservative forces to stop the jet?

11/12/19

How high can a hike climb with the energy from a candy bar?

A candy bar label says it has 240 Calories (240,000 calories). Typical efficiency of energy conversion for a human is 25%. If a 68kg person were to use the energy in the candy bar to climb a... more

11/09/19

Physics- Work/ Energy

Michael uses his bike to apply 407 N to himself and the bike by pedaling as he approaches a 1.5 m tall ramp which is 7.4 m away. He starts from rest to accomplish this feat. How fast will he be... more

10/25/19

A projectile of mass 5.0 kg is shot

A projectile of mass 5.0 kg is shot horizontally with an initial speed of 17 m/s from a height of 25.0 m above a flat desert surface. For the instant before the projectile hits the surface,... more

07/30/19

What does “energy transfer in cells” mean?

ADP and ATP are involved in energy transfer in cells. I know what is ATP and I know how ADP is formed, but I don’t understand what “energy transfer in cells” means.

07/30/19

Why alpha particles inestead of hydrogen or duetereum?

I know atoms undergoing alpha decay emit alpha particles, but I was wondering why specifically helium nuclei? If these atoms wanted to emit the smallest unit of matter (I'm talking about hadrons... more

07/23/19

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 to... more

07/16/19

How do I describe and calculate the effect of an impacting object?

My lab studies the physiology of impact injury on biological tissues. I use a pneumatic cylinder to impart injury into a biological sample and then assess the molecular and physiological changes in... more

07/11/19

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

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

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?

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

10/03/18

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

06/14/18

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    

05/08/18

Can mechanical energy be equal to gravitational potential energy

Can mechanical energy be equal to gravitational potential 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.
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