123 Answered Questions for the topic Energy

Energy Work

08/17/19

What is the answer?
1. a worker pushes in 50.0 kg box on a level floor at constamt velocity and moves a distance of 10.0 m. If a person pushes it with a force of 850N, what must be the magnitude and the direction of... more
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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.
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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
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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
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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
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07/11/19

Effects of Modafinil?
As someone who suffers from chronic insomnia and often has to get things done during the day without much or any sleep at all, I would like to know from those experienced what the effects are of... more
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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
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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
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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
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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
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06/07/19

what is kinetic energy?
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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
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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
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Energy Work Power

12/29/18

a spring requires force 120N strech 6cm if we more streche spring 6cm so what is work ?
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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
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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
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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
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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
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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    
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Energy

05/08/18

Can mechanical energy be equal to gravitational potential energy
Can mechanical energy be equal to gravitational potential energy
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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?
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Energy

04/11/18

amount of energy from 1 cm² surface radiates from black body for 1s. max of spectral density it's radiosity accounts for wavelength 4840Å is
Wien's constant b=2898
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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?
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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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01/12/18

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
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