Work
What is the work done of moving a 5N box 10 m ?
What is 50 J?
What is the potential energy of a 10 N box sitting on a shelf that is 2 m high?
What is 20 J?
What is the power consumed by a hairdryer that does 100 J of work for 10 s?
What is 10 W?
What is the work done in pushing a 5 kg box from rest to 5 m/s?
What is 62.5 J?
As the diver begins his dive, he loses _______ and gains _________.
What is potential energy and kinetic energy?
The mass of a box that got moved 20 m if the work done was 600 J?
3.06 kg
What is the kinetic energy of a box that is moving at 5 m/s and has a mass of 20 kg?
What is 250 J?
How much power is generated if we lift a 10 kg box a distance of 30 m in 120 seconds?
What is 24.5 W?
What is the work done in stopping a 500 kg truck from 30 m/s to rest?
What is -225,000J ?
If a diver has a weight of 100 N and is moving at 20 m/s when they hit the water, how high up did they start the dive?
What is 20.41 m?
The distance the box was moved if it has a mass of 10 kg and the work done was 900 J
9.18 m
What is the potential energy of a box that has a mass of 5kg sitting on a shelf that is 32 m high?
What is 1568 J?
If a 100 W computer does 500J of work, how long was it run for?
What is 5 seconds?
What was the original speed of a 15 kg box that had -300 J of work done in slowing it to 3 m/s?
What is 7 m/s?
How fast is a 100N diver moving when he hits the water if he has 1000J of potential energy on the diving board?
What is 14 m/s?
The force exerted by a spring is given by: F = (kx^4)/2 . If k is 100 N/m, find the work done by the spring on a mass from x = 0 m to x = 2 m.
What is 320J?
An object moves according to the function x = t^(7/2) where x is the distance traveled and t is the time.
What is a formula for the object's kinetic energy?
1/2 m (7/2 x^(5/2))^2
or (49/8)mx^5
What is the power delivered by gravity to a 6 kg block 4 s after it has fallen from rest?
What is 1200W?
A 2 kg block is pushed horizontally across a rough surface with a coefficient of kinetic friction of 0.2, at a constant speed of 4 m/s, by a force F. The work that is done by the force in 5 s is:
What is 80J?
Starting from rest, a skateboarder travels down a 25o incline that's 22m long. Using conservation of energy, calculate the skateboarder's speed when he reaches the bottom. Ignore friction.
What is 13.5 m/s?
A ball attached to a string rotates in a complete circle at a constant speed. The work done during each revolution is:
What is 0J?
A 5-kilogram ball moves in the x direction where x represents the ball’s position. The potential energy U of the ball in Joules is given as a function: U(x) = 4x2 - 3x + 2. The force on the particle at x = 4 m is _____
What is 29 N in the -x direction?
A student pushes a box across a rough, flat surface at a constant speed v. The box has a mass m, and the coefficient of sliding friction is represented by µ. The power supplied by the person to the box is
What is µmgv?
A spring force is given by the formula F = 20x - 12x^2 , where F is in N and x is in m. What is the change in potential energy when the spring is stretched 3 m from its equilibrium position?
What is 18J?
A solid metal object with mass of 25kg is dropped from rest at the surface of a lake that is 20m deep. The water exerts a drag force on the object as it sinks. If the total work done by the drag force is -3800J, what is the speed of the object when it hits the sand at the bottom of the lake?
What is 9.38m/s?