Unit 2
Jacob throws a fastball that travels at 50 meters per second. The batter stands 125 meters away from the pitcher. How many seconds does it take for the ball to reach the batter?
2.5 seconds
On a planet, there is a gravitational force with a magnitude for 225 newtons and that force acts upon a 70-kilogram astronaut. What is the gravitational field strength at this location?
3.2 N/kg
A .20 kg wood block sits stationary on a 25o inclined plane. What is the force of friction acting on the block?
.828N
A baseball player hits a pop fly straight up. The ball returns to its original height 7.2 seconds after it is hit. How high did the ball go?
63.6m
A 20kg object has a momentum of 80kgm/s. How far does the object travel in 10 seconds?
40m
If a car is traveling 30m/s, how many seconds will it take for the car to move 270 meters?
9 seconds
A horizontal force of 15 newtons is applied to a 5 kg mass. What is the acceleration of the mass if it is on a frictionless surface?
3m/s2
What is the force needed to stretch a spring with a constant of 50N/m a length of .04m?
2N
A basketball player jumped straight up for a rebound. If he was in the air for .90 second, how high did he jump?
.99m
A 4.0 kg lab cart is accelerated uniformly from rest to a speed of 4.0 m/s in .8s. What is the magnitude of the force producing this acceleration?
20N
A train was traveling at 500m/s and came to a full stop in 20 seconds. What is the train's rate of acceleration?
-25m/s2
A cannon shoots a cannonball that has a mass of 30kg with an acceleration of 5 meters per second2. What is the force at which the cannonball was shot?
150N
A .250kg mass is hung from a spring and stretches the spring 15cm. What is the constant of the spring?
.163N/m
A Nascar driver travels around a track with a radius of 450m in 36 seconds. Find the speed of the Nascar car.
78.5 m/s
A student lifts a box of books that weighs 220N. The box is lifted .500m. How much work does the student do?
110J
A boy drops a ball and it rolls into the street. A car traveling at 12m/s slams on the brakes to avoid hitting the boy comes to a full stop in 5 seconds. What was the acceleration of the car?
-2.4m/s2
A car that has a mass of 2000kg hits a bug that has a mass of .00015kg. The bug experiences an acceleration of 50m/s2 as a result of the collision. What is the magnitude of the force on the car?
.0075N
A 55kg student is standing .2 meters away from a 65kg student. What is the force of attraction between the two students?
5.96x10-6N
What velocity must a roller coaster car travel at through the top of a loop with a radius of 35m?
18.5m/s
A force of 750N is needed to push a car across a dirt lot. Two students push the car 55 m. How much work is done?
41250J
A truck with an initial speed of 10 meters per second accelerates uniformly at 4m/s2 for 5 seconds. What is the distance traveled in that time?
100 meters
A rubber tire, a mass of 5kg, slid across a level dry concrete road. What is the force of friction on the tire?
33.3N
A 500 g mass elongates a spring by .20m. How much will the same spring stretch when a 250 g mass is hung from it?
.1m
An unbalanced force of 50 newtons keeps a 4-kilogram object traveling in a circle of radius 4 meters. What is the speed of the object?
7.07m/s
Brendan pulls a wagon horizontally using 75J in 5 seconds. What power did he use?
15W