COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 6, Problem 75QAP
To determine
A water balloon is thrown straight down at 12.0 m/s from a second floor window, 5.00 m above ground level. How fast is the balloon moving when it hits the ground?
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* 77%
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25. Three stones are thrown with identical initial speeds from
the top of a cliff into the water below (see diagram). Air
resistance is negligible. The vertical speeds with which
stones 1, 2, and 3 strikes the water are .
Note: you may assume the angle of elevation and the angle of
depression for 1 and 3 are identical
a)
b) V, >v, = Vs
c)
d)
V >V, >V,
e)
V = V, = V3
f)
none of the above
26. A mote
of m
1.) Two snowy peaks are 790 m and 690 m above the valley between them. A ski run extends down from the top of the higher peak and then back up to the top of the lower one, with a total length of 4.4 km and an average slope of 20.0°. A skier starts from rest on the higher peak. At what speed will she arrive at the top of the lower peak if she just coasts without using the poles? Ignore friction.
2. ) Approximately what coefficient of kinetic friction between the snow and skis would make the skier stop just at the top of the lower peak?
.
*13-76. Prove that if the block is released from rest at
point B of a smooth path of arbitrary shape, the speed it
attains when it reaches point A is equal to the speed it attains
when it falls freely through a distance h; i.e., v = V2gh.
в
B
Chapter 6 Solutions
COLLEGE PHYSICS
Ch. 6 - Prob. 1QAPCh. 6 - Prob. 2QAPCh. 6 - Prob. 3QAPCh. 6 - Prob. 4QAPCh. 6 - Prob. 5QAPCh. 6 - Prob. 6QAPCh. 6 - Prob. 7QAPCh. 6 - Prob. 8QAPCh. 6 - Prob. 9QAPCh. 6 - Prob. 10QAP
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- Question 2) A 6.7 kg object initially starts from rest at the top of a ramp. The length of the ramp is 5.5 m and forms an angle of 23D above the horizontal. When the object reaches a height of 1.5 m, it has a speed of 3.0 m/s. 5.5 m m = 6.7 kg 1.5 m 23° e ons 180 er0 neewied nolant lo eonot ert ei Tams1 What is the force of friction? (c)arrow_forward4- A single frictionless roller-coaster car of mass m = 750 kg tops the first hill with speed v= 15 m/s at height h = 40 m as shown i- Find the speed of the car at B and C First hill- h/2 ii- If mass m were doubled, would the speed at B increase, decrease, or remain the same?arrow_forwardA ski jumper starts from rest 50.0 m above the ground on a frictionless track and flies off the track at an angle of 45.0 above the horizontal and at a height of 10.0 m above the level ground. Neglect air resistance, (a) What is her speed when she leaves the track? (b) What is the maximum altitude she attains after leaving the track? (c) Where does she land relative to the end of the track?arrow_forward
- A bungee cord is essentially a very long rubber band that can stretch up to four times its unstretched length. However, its spring constant vanes over its stretch [see Menz, P.G. “The Physics of Bungee Jumping.” The Physics Teacher (November 1993) 31: 483-487]. Take the length of the cord to be along the direction and define the stretch as the length of the cord minus its un-stretched length that is, (see below). Suppose a particular bungee cord has a spring constant, for of and for. (Recall that the of (Recall that the spring constant is the slope of the force versus its stretch (a) What is the tension in the cord when the stretch is 16.7 m (the maximum desired for a given jump)? (b) How much work must be done against the elastic force of the bungee cord to stretch It 16.7 m? Figure 7.16 (credit modification of work by Graeme Churchard)arrow_forwardIf the speed of a particle is doubled, what happens to its kinetic energy? (a) It becomes four times larger. (b) It becomes two times larger. (c) It becomes 2 times larger. (d) It is unchanged. (e) It becomes half as large.arrow_forwardTo give a pet hamster exercise, some people put the hamster in a ventilated ball andallow it roam around the house(Fig. P13.66). When a hamsteris in such a ball, it can cross atypical room in a few minutes.Estimate the total kinetic energyin the ball-hamster system. FIGURE P13.66 Problems 66 and 67arrow_forward
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