Physics Work,Power & Energy Level: University
Conservation of momentumA 50 kg bomb is sliding along an icy pond (no friction) with a speed of 2 m/s to the west. The bomb explodes into two pieces. After the explosion a 20 kg piece moves south at 4 m/s. What are the components of the velocity of the 30 kg piece?
Physics Work,Power & Energy Level: University
CollisionA 3.0 kg cart moving to the right with a speed of 1m/s has a head- on collision with a 5.0 kg cart that is initially moving to the left with a speed of 2 m/s. After the collision the 3.0 kg cart is moving to the left with a speed of 1 m/s. What is the final velocity of the 5.0 kg cart?
Physics Work,Power & Energy Level: University
Projectile MotionA projectile is launched with 200kg m/s of momentum and 1000J of kinetic energy. What is the mass of the projectile?
Physics Work,Power & Energy Level: University
Conservation of energyA skier leaves the top of a slope with an initial speed of 5.0 m/s.The speed at the bottom is 13m/s. What is the height of the slope?
Physics Work,Power & Energy Level: University
Conservation of energyA pebble rolls off a roof and falls vertically. Just before it hits the ground its speed is 17m/s. Neglecting air resistance what is the height of the building?
Physics Work,Power & Energy Level: University
Conservation of energyA person stands on the edge of a cliff and throws a stone vertically downward with an initial speed of 10m/s. The instant before the stone hits the ground it has 450J of kinetic energy. If the stone were to be thrown horizontally outward from the cliff with the same initial speed of 10m/s how much kinetic energy would it have just before it hits the ground?
Physics Work,Power & Energy Level: University
WorkA man is using a human powered mower to cut grass. The mower is pushed with a force of 45N directed at an angle of 41 degree below the horizontal direction. What is the work done in pushing the mower 9.1 m across the yard?
Physics Work,Power & Energy Level: University
Potential energyA spring is required a force of 1 N to compress it 0.1m. How much work is required to stretch it to 0.4m?
Physics Work,Power & Energy Level: University
How high is a waterfall if 300 kg of water acquires a kinetic energy of 400.000 joules by falling from the top of the waterfall to the ground?
Physics Work,Power & Energy Level: University
How high is a waterfall if 300 kg of water acquires a kinetic energy of 400,000 joules by falling from the top of the waterfall to the ground?
Physics Work,Power & Energy Level: Middle School
Rotational motionA rolling solid wheel (disk) with a mass of 5kg moves forward at a speed of 20 meters/ second determine it's total kinetic energy.
Physics Work,Power & Energy Level: University
An automobile weighing 2800 lbs. is traveling 55 MPH. What is the kinetic energy and what would be the speed of the atomobile if the kinetic energy were doubled?
Physics Work,Power & Energy Level: University
FrictionA 50 kg crate slides down a 5.0m loding ramp that is inclined at an angle of 25^0 to the horizontal. A worker pushes on the crate parallel to the surface of the ramp so that the crate slides down with a constant velocity. If the coefficient of kinetic friction between the crate and the ramp is 0.33 how much work is down by each of the following? (a) the worker (b) the force of friction (c) the force of gravity (d) What is the net work down on the crate?
Physics Work,Power & Energy Level: University
A constant horizontal force of 28 N moves a box with a constant speed along a rough surface. If the force does work at a rate of 50 Wa. What is the boxs speed?
b. How much work is done by the force in 2.7 s?
Physics Work,Power & Energy Level: University
A particular force is described by the equation F = (60 N/M) x x. How much work is done when this force pushes a box horizontally between the following points? (a) x0 = 0 and x = 0.12m (b) x0 = 0.15 m and x = 0.26m ( on this one it doesnt show up the right way here but the first x in the equation is in italics.