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Physics Chapter 4 HW
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Terms in this set (16)
When the net force that acts on a hockey puck is 12 N, the puck accelerates at a rate of 48 m/s2. Determine the mass of the puck.
0.25 kg
A net force of 25 N is applied for 5.7 s to a 12-kg box initially at rest. What is the speed of the box at the end of the 5.7-s interval?
12 m/s
A 975-kg car accelerates from rest to 26.7 m/s in a distance of 120 m. What is the magnitude of the average net force acting on the car?
2900 N
An apple crate with a weight of 225 N accelerates along a frictionless surface as the crate is pulled with a force of 14.5 N as shown in the drawing.
What is the horizontal acceleration of the crate?
0.597 m/s2
Two forces act on a 4.5-kg block resting on a frictionless surface as shown. What is the magnitude of the horizontal acceleration of the block?
1.8 m/s2
A woman stands on a bathroom scale in an elevator that is not moving. The scale reads 500 N. The elevator then moves downward at a constant velocity of 5 m/s. What does the scale read while the elevator descends with constant velocity?
500 N
What is the weight of a 2.50-kg bag of sand on the surface of the earth?
24.5 N
What is the magnitude of the gravitational force acting on a 79.5-kg student due to a 58.0-kg student sitting 2.40 m away in the classroom?
5.33 × 10-8 N
A 71-kg man stands on a bathroom scale in an elevator. What does the scale read if the elevator is ascending with an acceleration of 3.0 m/s2?
910 N
A 100-kg car accelerates from rest to 25 m/s in a distance of 125 m. What is the magnitude of the average net force acting on the car?
2500 N
A car is initially traveling at 50.0 m/s. The brakes are applied and the car stops over a distance of 125 m. What was magnitude of the car's acceleration while it was braking?
10 m/s2
A net force of 25 N is applied for 5.7 s to a 12-kg box initially at rest. What is the speed of the box at the end of the 5.7-s interval?
12 m/s
On a two lane highway, a car is following a pickup truck. At one instant, the car has a speed of 32 m/s and is 184 m behind the truck. At the same time, the truck has a speed of 28 m/s. If neither vehicle accelerates, how long will it take the car to catch up to the truck?
46 s
When the net force that acts on a hockey puck is 20 N, the puck accelerates at a rate of 5 m/s2. Determine the mass of the puck.
4.0 kg
A 100-kg car accelerates from rest to 25 m/s in a distance of 125 m. What is the magnitude of the average net force acting on the car?
2500 N
A car is initially traveling at 50.0 km/h. The brakes are applied and the car stops over a distance of 35 m. What was magnitude of the car's acceleration while it was braking?
2.8 m/s2
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