A bead with a hole through it slides on a wire track. The wire is threaded through the hole in the bead, and the bead slides without friction around a loop-the-loop (s figure below). The bead is released from rest at a height h = 3.90R. h R (a) What is its speed at point A? (Use the following as necessary: the acceleration due to gravity g, and R.) V = (b) How large is the normal force on the bead at point A if its mass is 5.60 grams? magnitude N direction ---Select--- (c) What If? What is the minimum height h from which the bead can be released if it is to make it around the loop? (Use any variable or symbol stated above as necessary.) h =

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I Review I Constants An ideal spring stores potential energy Uo when it is compressed a distance xo from its uncompressed length. sS Part C In terms of xo , how much must the spring be compressed from its uncompressed length to store twice as much energy? Express your answer in terms of xo. nν ΑΣφ ? Submit Request Answer Part D In terms of xo, how much must the spring be compressed from its uncompressed length to store half as much energy? Express your answer in terms of x0. ?

A roller coaster ride starts at a height of 35 m above the ground. The mass of the car is 450 kg. Assuming friction can be ignored. What will the speed of the car be at the top off the first 20 m loop?

A crate with mass m = 33.3 kg being pushed up an incline that makes an angle φ = 22.7 degrees with horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ = 0.358. Consider the work done on the crate as it moves a distance d = 5.32 m at constant speed. a. What is work done by the pushing force, in joules?  b. What is the work done by friction, in joules?  c. What is the work done by gravity, in joules?  d. What is the net work, in joules?

A block with a mass of 39.0 kg is pushed with a horizontal force of 150 N. The block moves at a constant speed across a level, rough plane a distance of 6.75 m. What is the work done (in J) by the 150 N force? J? What is the coefficient of kinetic friction between the block and the plane?

A small block of mass m slides without friction around a loop apparatus shown below. (a) If the block starts at rest at point A, what is its speed at B? (b) What is the force of the track on the block at point B?

A 8.67 kg8.67 kg particle is subjected to only conservative forces, and its potential energy diagram is shown.   Between points G and K, at what location is the particle moving the fastest? J G K The particle is moving at the same speed at all of the points listed here. I H At point D, the particle has a speed of 14.1 m/s.14.1 m/s. What is the maximum speed ?maxvmax achieved by the particle between points G and K? Assume the points on the graph can be determined to three significant digits. Therefore, the calculated value for maximum speed should contain three significant digits.

A .770kg ball is attached to a 1.50m string and swung in a vertical circle. What is the total work done on the ball by gravity and tension?

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