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A force of 250N acts on a mass of 50Kg for 8 seconds. If the mass is initially at rest, determine the acceleration, the final velocity and the displacement.
a crowbar 2m long is used to lift a rock 800n. if the fulcrum is 0.25m from where the crowbar touches the rock, how much effort must be applied to move the rock
A commuter train blows its horn as it passes a passenger platform at a constant speed of 30.0 m/s. The train horn sounds at a frequency of 305 Hz when the train is at rest.
If one observes a very red celestial object, its color can be due to the temperature if being; a cold star or due to the very high speed which it moves away from us. EXPLAIN how spectral lines can be used to conclude one way or the other
A 0.45 caliber bullet (m = 10.7 g) is fired into a large block of wood (M = 0.750 kg) so that the bullet becomes lodged in the block. What is the speed of the block after the collision
Two people with a combined mass of 123kg hop into an old car with worn-out shock absorbers. Find the total load supported by the springs
A 3.8-kg block of iron (c=0.11 kcal/kgoC) that has been brought to a temperature of 1,078oC is placed on top of a 2.4-kg block of ice (c=0.5 kcal/kgoC) that has been cooled to -50oC
An ultralight plane and pilot have a total mass of 168 kg, what is the net force acting on the plane and pilot
A solid, rectangular iron bar measures .40cm by 1.0cm by 30cm. Find the resistance between each of the three pairs of opposing faces, assume the faces in question are quipotentials.
A lens is located 30 centimeter to the right of an object, with an image clearly focused on a screen 45 centimeter from the lens. Evaluate the focal length of each lens
a .25 x .25 square specimen of a material of yield strength 50000 psi is loaded to this yield point and released. the
A 0.03-kg lead bullet traveling 290 m/s strikes an armor plate and comes to a stop. If all of the bullet's energy is converted to heat that it alone absorbs, What is its temperature change
On a part-time job, you are asked to bring a cylindrical iron rod of density 7800kg/m3, Calculate the weight of the rod, w
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