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We use automoderator for a few things. It may delete a post erroneously. We ban all bots. What is the instantaneous rate at which the force does work on the object? At some other time, the velocity consists of only a j component. If the force is unchanged, and the instantaneous power is W, what is the velocity of the object just then? The other end of the rod is pivoted so that the ball can move in a vertical circle. The rod is held horizontally as shown and then given enough of a downward push to cause the ball to swing down and around and just reach the vertically up position, with zero speed there.

Neglect the effects of air resistance and assume the ramp is frictionless. What is the maximum height h of his jump above the end of the ramp? The box is released from rest when the spring is unstretched.

Assume that the pulley is massless and frictionless. Two children are playing a game in which they try to hit a small box on the floor with a marble fired from a spring-loaded gun that is mounted on a table. Bobby compresses the spring 1. How far should Rhoda compress the spring to score a direct hit?

A horizontal force of magnitude During that displacement, the thermal energy of the block increases by What is the increase in thermal energy of the floor? A funny car accelerates from rest through a measured track distance in time T with the engine operating at a constant power P. If the track crew can increase the engine power by a differential amount dP, what is the change in the time required for the run? Use any variable or symbol stated above as necessary.

Plug this into the rate of work equation to find the instantaneous velocity. What is the starting energy? What will be the final energy? Look for any terms that might cancel out. Is the solution dependent on mass? Use the energy equation. You need to travel the vertical component of the 12 cm downslope distance.

That will give you your potential energy. You will convert that into kinetic energy. The spring will steal some energy away because it is working against you. Use the given compression and initial travel distance to find the k constant of the spring. You need to find the time it takes for the ball to travel that distance.

That is your limiting factor, the time you have to travel the required distance. From there, you can find your necessary velocity.

Plug that back into the energy equation to find the needed compression distance for the spring. Harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing, show more. Engineers are designing a system by which a falling mass m imparts kinetic energy to a rotating uniform drum to which it is attached by thin, very light wire wrapped around the rim of the drum the figure Figure 1.

There is no appreciable friction in the axle of the drum, and everything starts from rest. This system is being tested on earth, but it is to be used on Mars, where the acceleration due to gravity is 3. In the earth tests, when m is set to But in part b, How fast would the Are you sure you want to delete this answer?

If the drum gained of those J, the mass must have gained the rest: The answer is approximately 9. Related Questions Physics homework help, mastering physics?

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The Work, Energy, and Power in Physics chapter of this High School Physics Homework Help course helps students complete their work, energy, and.

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Physics Homework Help. Study of science of matter, energy and the relation between them is called physics. The study began prior to ancient Greek era when matter started becoming the subject of human interest. Nov 07,  · HELP PLEASE!!:) (2)Compute the x and y coordinates of the centre of mass of the piece. => i'm not sure what steps are to computing coordinates.