13. In which one of the following circumstances could mechanical en- ergy not possibly be conserved, even if friction and air resistance are ab- sent? (a) A car moves up a hill, its velocity continually decreasing along the way. (b) A car moves down a hill, its velocity continually increasing along the way. (c) A car moves along level ground at a constant velocity. (d) A car moves up a hill at a constant velocity.

13. In which one of the following circumstances could mechanical en- ergy not possibly be conserved, even if friction and air resistance are ab- sent? (a) A car moves up a hill, its velocity continually decreasing along the way. (b) A car moves down a hill, its velocity continually increasing along the way. (c) A car moves along level ground at a constant velocity. (d) A car moves up a hill at a constant velocity.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter5: Newton's Law Of Motion

Section: Chapter Questions

Problem 49P: A baseball catcher is performing a stunt for a television commercial. He will catch a baseball (mass...

See similar textbooks

Similar questions

A baseball catcher is performing a stunt for a television commercial. He will catch a baseball (mass 145 g) dropped from a height of 60.0 m above his glove. His glove stops the ball in 0.0100 s. What is the force exerted by his glove on the ball?
A car traveling at 22 m/s runs out of gas while traveling up a 200 slope. How far up the hill will it coast before starting to roll back down? Assume that car rolls without friction.
A woman pushes an initially stationary 11.3 kg gift up a 15.90 ramp a distance of 7.21 m. If she pushes with constant force of 84.0 N and the coefficient of friction is 0.333, what is the final velocity of the gift?
A block with a mass of 4.0 kg is released from rest and slides down a long, smooth ramp. The incline of the ramp is 46.0 degrees, and the coefficient of kinetic friction is μ=0.346. How far will the block travel in 1.00 s, assuming it does not reach the end of the ramp?
Only one force acts on an object.Can the object have zeroacceleration? Can it have zero velocity? Explain.
The normal force on an extreme skier descending a very steep slope (Fig. 4–42) can be zero if(a) his speed is great enough.(b) he leaves the slope (no longer touches the snow).(c) the slope is greater than 75°.(d) the slope is vertical (90°).
Neglecting friction and air resistance, a car with an initial velocity of 76.5 km/h coasts up a hill and comes to stop at the hill's top. What must be the height of the hill (in meters)
A 10 kg object starts from rest and achieves a speed of 20 m/s in 10 s. How much force (in N) acted on the object?
A shopper in a supermarket pushes a loaded cart with a horizontal force of 10 N. If the cart has a mass of 30 kg, how far will it move in 3 s, starting from rest? (Ignore friction)
23) An object of mass 2 kg is thrown straight upward with a velocity of 10 m/s. Neglecting air resistance, how high does the object go? a) 5 b) 10 c) 100 d) 200
A barge is being pulled through a canal by two horses, as shown in Figure 2.27a. If each horse applies a force of 5000 N, determine the frictional force applied by the water as the barge moves at a constant speed.
There is an object with a mass of 2.6 kg that is free to move on a horizontal surface without any presences of friction. Initially, it's at rest and then starts moving under a net force of F =(3N)i^+(4N)j^. What's object's speed in m/s after moving 1 meter?