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A rock is dropped off the side of a bridge and hits the water below 5.7 s later.
(a) What was the rock's velocity when it hit the water?
speed:
direction:
(b) What was the rock's average velocity as it fell?
direction :
(c) What is the height of the bridge above the water?
A rocket with mass 1000kg accelerates upwards at a rate of 20m/s (a) How long does it take before it is going at the speed of sound (334 m/s)? (b) How long does it take before the rocket is at a height of 100km?
A hot (70 C) lump of metal has a mass of 250 gm and a specific heat of .25 cal/gm-C. John drops the metal into a 500 gm calorimeter (specific heat of .10 cal/gm-C) containing 75 g of water at 20 C. Once they reach equilibrium, what will be the fin..
How many times hotter than the Sun's surface is the surface of a star the same size, but that gives off twice the Sun's energy per second (that is, is twice as luminous)?
The edge of a cube consist of equal resistors of resistance R, that are joined at the orners, let a battery be connected to two opposite corners of a face of cube. what is the efective resistance.
A toy of mass 0.155 kg is undergoing SHM on the end of a horizontal spring with forces constant 305 N/m. When object is a distance 1.20×10-2 m from its equilibrium position, it is observed to have the speed of 0.255 m/s.
A 2.30-?F capacitor is fully charged by being connected to a 6.0-V battery, Calculate the maximum current in the inductor, Calculate the frequency of oscillation of the LC circuit
A steel rod is 3 cm in diameter at 25 C. A brass ring has an interior diameter of 2.992 cm at 25 C. At what common temperture will the ring just slide into the rod?
A cell phone battery uses chemistry to create a charge separation between the terminals (anode and cathode). How many free electrons does the battery contain
Compute the change in entropy of 1 gram of water as it goes from solid ice at 0 celsius to water vapor at 100 Celsuis
A cat runs along a straight line (the x-axis) from point A to point B to point C. The distance between points A and C is 5.00 m, distance between points B and C is 10.0 m, and the positive direction of x axis points to the right. The time to run f..
A girl delivering newspapers covers her route by traveling 9.99 blocks west, 4.00 blocks north, and then 1.00 blocks east
A 50.0 kg skier is at the top of a slope. At the initial point at the top is 25.0 m vertically above point at the bottom. find the change in Potential energy of the skier-Earth system as the skier goes from top to bottom
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