Billy and his sled have a mass of 39.1 kg. He is at rest at the top of a 9.54 m long hill that has an angle of 35.01° from the horizontal. The hill has iced over and Billy is going to accelerate down the hill without any energy loss due to friction. Then move across the horizontal section of the land at the base of the hill. There is friction on the horizontal section and it will slow and eventually stop his motion.

You are to determine the horizontal distance he will travel along the horizontal section of the land.

The gravitational field strength on the planet with this hill is 11.10 m/s/s and the coefficient of friction on the horizontal section is 0.40.

The curvature at the bottom of the hill can be neglected.

When you are ready to check your answers, hit the end button.

Follow these directions and answer the questions. 1. set up the ripple tank as in previous investigations. 2. bend the rubber tube to form a "concave mirror" and place in the ripple tank. the water level must be below the top of the hose. 3. generate a few straight pulses with the dowel and observe the reflected waves. do the waves focus (come together) upon reflection? can you locate the place where the waves meet? 4. touch the water surface where the waves converged. what happens to the reflected wave? 5. move your finger twice that distance from the hose (2f = c of c, center of the curvature) and touch the water again. does the image (the reflected wave) appear in the same location (c of c)? you may have to experiment before you find the exact location. sometimes it is hard to visualize with the ripple tank because the waves move so quickly. likewise, it is impossible to "see" light waves because they have such small wavelengths and move at the speed of light. however, both are examples of transverse waves and behave in the same way when a parallel wave fronts hit a curved surface.

Afigure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 20.9 12000 200 3.33

Friction removes energy from objects in motion. which statement best describes how this works? a) friction transforms ke into thermal energy b) friction transfers thermal energy to ke c) friction transforms te into pe d) friction transforms pe into ke e) friction transfers ke into pe