110 Answered Questions for the topic Energy

Energy Physics

19d

#### Physics (energy)

A boy pulls a rope attached to a 22 kg sled on an icy, frictionless surface with an acceleration of 2.0 m/s2. Calculate the work done by the boy if he is pulling the rope at 35° to the horizontal...
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Energy Physics

03/28/21

#### Physics Question

A roller coaster goes over a 15 m tall hill then approaches a 29 m hill. What is the minimum velocity the roller-coaster would need when going over the 15 m hill to make it to the top of the 29 m...
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#### A rectangular room of length 6 metres has six 18 W LED lights.

What is the maximum width of the room if the lamp power density requirement of 5W/m^2 (5 Watts per metre squared) is to be met?

#### Conservation of Energy

The potential energy function of a conservative force acting on an object is given by the expressionU=y-2x2-2xwhere U is in joules and x, y, z are in meters. Consider the following two points in...
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Energy Physics

10/30/20

#### I know the standard formula, but how would I use it in this context?

The Sun generates energy at the rate of about 3.9 × 1026 W. Use Einstein’s equation to verify that the Sun loses mass at the rate of about 4 million tonnes per second.

07/28/20

#### Physics Energy Question

A ray of light strikes a side of lucite ( = 1.50) prism at 40° as shown below. Find the angle that the light leaves the prism.The prism is a isosceles with a degree of 70 at the top.

07/22/20

#### Physics Energy Question

A 5.0 kg crate is pushed across a horizontal surface by a 60.0 N force directed 32°C below the horizontal. Determine the work done on the crate by this force after the crate moves 8.0 m.

Energy Physics

07/22/20

#### Physics Energy Question

A 12 Kg object starts at rest on a horizontal surface. The object is pushed along the surface with a net force of 8.0 N. What is the speed of the object after it has traveled 5.0 m?a) Solve using...
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Energy Physics

04/24/20

#### Pop-up Toy Physics Situation

Please help. An inventor has created a spring-loaded toy that pops up off the table when compressed and released. The toy consists of two connected parts by a stiff spring as shown, with one of the...
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#### You are pushing a large box across a frictionless.....(IN THE DESCRIPTION)

You are pushing a large box across a frictionless floor by applying a constant horizontal force. If the box starts at rest, you have to do work W_1 in order for the box to travel a distance d in...
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#### Your physics book is resting in front of you on a horizontal table in the campus library. You push the book over to your friend,...... (IN THE DESCRIPTION)

Your physics book is resting in front of you on a horizontal table in the campus library. You push the book over to your friend, who is seated at the other side of the table, 0.400 m m north and...
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#### Which of the following are identical amounts of energy?

1kJ and 1 kcal1kJ and 239 cal1kJ and 1 Cal4.184 J and 1 kcal

Energy Science

01/19/20

#### What is the equation for energy?

I guess I’m looking for the mathematical equation

12/21/19

#### Average Kinetic Energy of 2 Objects

If I had 2 objects of equal mass ( 10kg for example ), and knew that the average speed of the 2 objects was 8 ms-1 , is it possible to calculate the average kinetic energy of the 2 objects. I...
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#### 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?

#### 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...
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Energy Physics

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...
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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,...
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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...
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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.

#### 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...
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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...
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#### 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...
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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...
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