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An empty freight car of mass 8000 kg rolls at 5 m/sec along a level track and collides with a loaded car of mass 16,000 kg, standing at rest with its brakes released. If the cars couple together, find their speed after the collision. Also, find the decrease in kinetic energy as a result of the collision. Is the collision elastic or inelastic?
A boat's mast is held by two cables, one attached to the front of the ship and the other to the back. What is the force acting upwards on the mast exerted by the boat at the bottom of the mast
A diving bell has a weight of 100000 N when measured on shore. What is the buoyant force, FB, on the diving bell
A 40g block of ice is cooled to -78 deg celcius and is then added to 560g of water in an 80g copper calorimeter at a temperature of 25 degrees celcius, determine how much ice is left
A large capacitance of 1.20 mF is needed for a certain application. Calculate the volume of Teflon alone in the capacitor
a roller coaster had an intial velocity of 80 ms and abruptly came to a stop at the end of the ride. it took 10 seconds
A hare and a tortoise compete in a race over a straight course 1.00 km long. The tortoise crawls at a speed of 0.200 m/s toward the finish line. For how long in time was the hare stationary
A charged isolated metal sphere of diameter 20.0 cm has a potential of 9000 V relative to V = 0 at infinity. Calculate the energy density in the electric field near the surface of the sphere
A solenoid is 1.6 m long and has 530 turns per meter. what is the cross sectional area of this solenoid if it stores .31 J of energy when it carries I=14A
How much force is required to hold a 7.20 cm diameter hose delivering 470 L/min by a 0.73rm cm diameter nozzle.
A viewing window on the side of a large tank at a public aquarium measures 32 in. by 37 in. The average gauge pressure from the water is 6 psi
q1. a hotel elevator ascends 270 m with a maximum speed of 5.0 ms. its acceleration and deceleration both have a
A nail projects 25.0 mm horizontally outward from a wall. A 400 N picture is hung from the end of the nail and the nail deflects downward by 2.00 x 10^-5. what is the diameter of the nail
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