Work
This much work must be done to accelerate an 800 kg car from 15 m/s [F] to 30 m/s [F]?
What is 270 000 J?
This is the amount kinetic energy possessed by a 5.0 kg cat running with a speed of 4.1 m/s
What is 42 J?
A 1.2 kg ball rests on a spring that is compressed by 0.22 m. This is the elastic potential energy of the ball.
What is 1.3 J?
This is the momentum of a 3.5 kg medicine ball rolling with a velocity of 0.82 m/s [F].
What is 2.9 kg m/s [F]?
What is 4.2 m/s [F]?
A librarian lifts a fallen book at a constant speed up to the top shelf of a bookcase that is 1.9 m tall. If the book has a mass of 0.40 kg, this is the amount of work done by the librarian.
What is 7.4 J?
A roller coaster has a steep drop that leads into a 15 m tall loop. To safely go around the loop, the cart must be travelling with a speed of 12 m/s. This is how high the initial drop must be.
What is 22 m?
A spring-loaded toy uses a compressed spring to fire a marble out of a tube. A force of 310 N compresses the spring by 0.16 m. This is how fast a 76 g marble will travel if it is launched by the toy.
What is 26 m/s?
A child hits a 140 g baseball off a tee. When it leaves the tee, the ball is moving at 32 km/h [E]. If the bat was in contact with the ball for 0.02 seconds, this is the force exerted by the child on the ball.
What is 60 N [E]?
A 1500 kg car is moving at 65 km/h [F] when it collides with a 1800 kg truck parked on the side of the road. After the crash, the two cars stick together and continue moving forward. This is the velocity of the two cars after the collision.
What is 8.2 m/s [F]?
A man begins pushing a crate up a hill with an angle of 15°. His initial force is 53 N but it increases by 8.0 N for every metre he goes up the hill. If the side of the hill is 13 m, this is the total amount of work done by the man.
What is 1.4 x 103 J?
A 3.0 kg rock drops from a 22 m tall cliff. This is the amount of kinetic energy possessed by the ball after it has fallen 3/4 of the way down.
What is 4.9 x 102 J?
A mass-spring system undergoes SHM. The elastic potential energy at the maximum stretch of the spring is 7.60 J, the mass is 0.25 kg, and the spring constant is 260 N/m. This is the frequency and amplitude of oscillation.
What is 5.1 Hz and 0.24 m?
A 0.45 kg soccer ball moving at 20 m/s [F] is kicked back in the opposite direction at 30 m/s in 0.05 s. This is the average force of the kick.
What is 4.5 x 102 N [B]?
A 1.2 kg cart moving with a velocity of 5.4 m/s [F] collides with another 1.6 kg cart moving at 3.7 m/s [B] in a head-on elastic collision. The collision is cushioned by a spring with a constant k = 6.2 x 104 N/m. This is the velocity of the two carts at the point of maximum compression.
What is 0.20 m/s [F]?
A man drags a 25 kg sled across the snowy ground using a force of 85 N [E 55° U]. The sled accelerates at 0.92 m/s2 over a distance of 5.2 m. This is the work friction does on the sled.
What is -1.3 x 102 J?
Ten books are stacked on top of each other in a library. Each book is 8.0 cm thick and has a mass of 1.2 kg. This is the total amount of energy stored in the stack of books.
What is 47 J?
A 45 kg child lands on a trampoline, compressing it 0.45 m. At the height of his jump, the child was 1.6 m above the trampoline. This is the spring constant of the trampoline.
What is 8.9 x 103 N/m?
In Twilight, Edward stopped a car with his bare hands. The car had a mass of 1500 kg and was moving at 15 m/s toward Bella. Edward was able to stop the car in a total of 1.9 seconds. This is the average force Edward exerted on the car.
What is 1.2 x 104 N [away from Bella]?
What is 1.1 m/s [B] and 0.95 m/s [B]?
A car tows a 210 kg trailer behind it using a rope. The coefficient of friction between the trailer and the ground is 0.30. The trailer accelerates from rest to 11 m/s [F] in 2.5 seconds. This is the magnitude of the force of tension in the rope.
What is 1.5 x 103 N?
A 71 kg skier travels down a 14 m tall hill. There is a flat portion at the bottom of the hill. He travels 4.0 m [F] along the flat portion before coming to a stop. This is the friction force exerted by the snow on the skier on the flat portion.
What is 2.4 x 103 N [B]?
A spring with a spring constant of 4.5 N/m has a 0.35 kg box attached to one end such that the box is hanging down from the spring at rest. The box is then pulled down another 16 cm from its rest position. This is the maximum height, the maximum speed, and the maximum acceleration of the box.
What is 0.16 m above equilibrium, 0.57 m/s, and 2.1 m/s2?
You have enrolled in a gameshow. Your task is to stop one of the objects in front of you in less than 3.0 seconds. One object is a 1500 kg tractor moving with a velocity of 0.4 m/s [F]. The other is a 1.2 kg bowling ball moving much faster - at 12 m/s [F]. If the maximum force you can exert is 450 N, which object should you pick?
What is the bowling ball?
A 265 000 kg cargo plane moving at 170 m/s [E 38° S] grazes an empty 55 000 kg passenger plane moving at [W 65° S]. After the collision, the cargo plane has a velocity of 140 m/s [E 14° S]. This is the velocity of the passenger plane after the collision.
What is 3.4 x 102 m/s [W 88° S]?