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Chapter Four

 

Find the total work done on a cart with a mass of 75-kg, if the applied force is 294 Newtons and the coeficient of friction is .4.
0 J
100 J
294 J
Not enough Info
How much work is required to make an object move at a constant speed? In other words, what is your work equal to?
Same as frictional work
More than frictional work
Less than frictional work
How much work is required to overcome the work done by friction on a box that has a mass of 20.0-kg and is moved 10.0 meters. The coefficient of friction is .5
980 J
1000 J
1500 J
2000 J
Not enough Information
Find the force in pounds that a golf club exerts on a golf ball if the the ball has a mass of .046-kg and it reaches a speed of 70.0 m/s with an impact distance of .0170 meters.
15 pounds
150 pounds
1500 pounds
50 pounds
Not enough Information
A car with a certain mass starts from rest and accelerates to 30 mph. How much more work is required to accelerate the same car from rest to 60 mph?
Same
Two times
Three times
Four times
Not enough Information
A 1000-kg car traveling at 60 mph will sustain 359,700 Joules of work (damage) if it hits a wall. How high should the car be raised to do the same amount of damage (work) when it hits the ground?
50 ft
70 ft
100 ft
120 ft
150 ft
A pile driver is raised above a car a certain distance. How much higher should it be raised so that it does twice the amount of work (damage) to the car?
Two times
Three times
Four times
How much higher from the original distance does the driver need to be raised from the previous problem to hit the car with twice the speed?
Two times
Three times
Four times
If you throw a rock straight into the air with a kinetic energy equal to 100 J, how high will it go if its mass is .5-kg?
10 meters
15 meters
20 meters
30 meters
Not enough info
If you were to double the speed of the rock you threw from the question above, how high would it go?
20 meters
40 meters
60 meters
80 meters
Not enough info