Download 1 - Jaclyn Kuspiel Murray

1. A 59-kg person on skis is going down a hill sloped at 30° from the horizontal. The
coefficient of friction between the skis and the snow is 0.18. What would be the
magnitude of the acceleration?
m/s2
2. A force of 42.0 N accelerates a 5.0-kg block at 6.3 m/s2 along a horizontal surface.
(a) How large is the frictional force?
N
(b) What is the coefficient of friction?
3. A 210-kg crate is pushed horizontally with a force of 700 N. If the coefficient of
friction is 0.20, calculate the acceleration of the crate.
m/s2
4. Joe wishes to hang a sign weighing 730 N so that cable A, attached to the store, makes a 30.0°
angle, as shown below. Cable B is horizontal and attached to an adjoining building. What is the
tension in cable B?
N
5. A sled with a mass 51.0 kg is pulled along flat, snow-covered ground. The static
friction coefficient is 0.30, and the kinetic friction coefficient is 0.10.
(a) What does the sled weigh?
N
(b) What force will be needed to start the sled moving?
N
(c) What force is needed to keep the sled moving at a constant velocity?
N
(d) Once moving, what total force must be applied to the sled to accelerate it at 2.9 m/s2?
N
6. Your mass is 60 kg. You stand on a bathroom scale in an elevator on Earth.
(a) What force would the scale exert when the elevator moves up at a constant speed?
(b) What force would the scale exert when it slows at 1.9 m/s2 while moving upward?
(c) What force would the scale exert when it speeds up at 1.9 m/s2 wile moving downward?
(d) What force would the scale exert when it moves downward at a constant speed?
(e) What force would the scale exert when it slows to a stop at a constant magnitude of
acceleration?
7. You place a 7.30-kg television on a spring scale. If the scale reads 73.35 N, what is the
acceleration due to gravity at that location?
m/s2 (downwards)
8. An 883-kg (1951 lb) dragster, starting from rest, attains a speed of 27.0 m/s (60.5
mph) in 0.59 s.
(a) Find the average acceleration of the dragster during this time interval.
m/s2
(b) What is the magnitude of the average net force on the dragster during this time?
(c) Assume that the driver has a mass of 68 kg. What horizontal force does the seat exert
on the driver?
9. Suppose a 67-kg boy and a 46-kg girl use a massless rope in a tug-of-war on an icy,
resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the
magnitude of the acceleration of the boy toward the girl.
m/s2
10. A 23 kg suitcase is being pulled with a constant speed by a handle that is at an angle
of 23° above the horizontal. If the normal force exerted on the suitcase is 205 N, what is
the force F applied to the handle?