Question 5 A matchbox car track begins at a height y=1.0, goes down hill to y=0, goes around a vertical loop of radius 0.2 m and then goes back up a smaller hill to end at a height y=0.3 m. The speed of the car at the end of the track is closest to which value? 2 m/s 2.5 m/s 3.0 m/s 3.5 m/s 4.0 m/s 4.5 m/s

A roller coster has a loop with 7.62 diameter. a) What is the minimum height above the bottom of the loop required to acheive enough speed so that the coaster does not loose contact with the track? b) How many g's does the passenger expirience at the top of the loop AND at the bottom of the loop upon entering the loop.? c) suppose the coaster came to rest at 3/4 h on the other side of the loop. What fraction of the energy was lost?

A playground slide is in the form of an arc of a circle that has a radius of 13 m. The maximum height of the slide is h = 3.2 m, and the ground is tangent to the circle (see the figure). A 23 kg child starts from rest at the top of the slide and has a speed of 4.0 m/s at the bottom. (a) What is the length of the slide? (b) What average frictional force acts on the child over this distance? If, instead of the ground, a vertical line through the top of the slide is tangent to the circle, what are (c) the length of the slide and (d) the average frictional force on the child? (a) Number i (b) Number (c) Number (d) Number Units Units Units Units

A basketball player throws a basketball m = 1 kg straight up with an initial speed of v0 = 9.5 m/s. The ball leaves his hand at shoulder height h0 = 2.2 m. Let gravitational potential energy be zero at ground level. Give the total mechanical energy of the ball E in terms of maximum height hm it reaches, the mass m, and the gravitational acceleration g.

A 108 kg man is skiing across level ground at a speed of 9.5 m/s when he comes to the small slope 1.2 m higher than ground level shown in the following figure. -8.0 m- f1.2 m (a) If the skier coasts up the hill, what is his speed (in m/s) when he reaches the top plateau? Assume friction between the snow and skis is negligible. 8.16 m/s (b) What is his speed (in m/s) when he reaches the upper level if a 75 N frictional force acts on the skis? 6.31 X m/s

Tarzan swings on a 35.0-m-long vine initially inclined at an angle of 34.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? m/s(b) What is his speed at the bottom of the swing if he pushes off with a speed of 6.00 m/s? m/s

In the figure below, a block slides along a path that is without friction until the block reaches the section of length L = 0.80 m, which begins at height h = 2.0 m on a ramp of angle = 30°. In that section, the coefficient of kinetic friction is 0.55. The block passes through point A with a speed of 8.0 m/s. If the block can reach point B (where the friction ends), what is its speed there, and if it cannot, what is its greatest height above A? m/s BA O Ꮎ

A 4 kg box slides down an incline plane. It has an incline of 1.25664 radians and coefficient of kinetic friction of .5, what’s the final speed of the box if it started at rest and change in height is 6.4 m

A 260 g particle in a semi-spherical bowl of radius 0.6 m is released from rest at point A at the level of the center of the bowl, and the surface of the bowl is rough. The speed of the particle at B is 2 m/s. The acceleration of gravity is 9.8 m/s2 . a)What is its kinetic energy at B? b)What is the magnitude of the energy lost due to friction as the particle moves from A to B?

A 67.5-kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12.0 m, as shown below. The snow is so slippery it can be considered to be frictionless. If the skier's speed a point A is 9.64 m/s, what is the skier's speed at point B? (enter your answer to three significant figures) possibly useful: K, + U, = K, + U, + AQ K = (1/2)mv2 W = mg Ugrav = mgh r 12 m %3D 1.75 m g = 9.81 m/s? (FJnet = mac = mv/r 9.64 m/s Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part B What is the normal force exerted on the skier at point B? (enter your answer to three significant figures) Submit Request Answer