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A 20,000-kg railroad car travels down the track at 30 m/sec and hits a second stationary railroad car of 10,000 kg. The cars become coupled and continue traveling. Calculate the final velocity of the cars.
A 72 kg man in a 5-kg chair tilts back so that all weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area with the radius of 1.0 cm, and find out the pressure exerted on the floor by eac..
Estimate how many times planet has orbited its star
A dampled harmonic oscillator is made from a 0.8kg mass on a k=14N/m spring with a damping constant of 400g/s, what is the initial energy of the oscillator
15 mol of an ideal gas expands isothermally at 373 K to 12.5 its inital volume. Find the heat flow into the system
A cubical box .2 m on a side is completely immersed in a fluid. The pressure at the top of the box is 105 kPA, What is the denstiy of the fluid
An air bubble has a volume of 1.80 cm3 when it is released by a submarine 120 m below the surface of a lake. Find the force exerted by the gas on one of the walls of the container
The position function x(t) of a particle moving along an x axis is x = 4.0 - 4.5t2, At what positive time does the particle pass through the origin
A cell membrane has a surface area of 1.00 x 10-7 m2, a dielectric constant of 5.17 and a thickness of 8.17 nm. How many positive ions are there on the outside of the membrane
A world champion hammer thrower, rotates at a rate of 3.5 revolutions/sec just prior to releasing the hammer. What was the linear velocity of the hammer at release
The position of an object connected to a spring varies with time according to the expression x = (4.4 cm) sin(6.9?t). (a) Find the period of this motion.
A generator has a square coil consisting of 500 turns. The coil rotates at 82 rad/s in a 0.49 T magnetic field. What is the length of one side of the coil
A horse is capable of moving at four different speeds: walk (1.9 m/s), trot (5.0 m/s), canter (7.0 m/s), and gallop (12 m/s). Ann is learning how to ride a horse. She spends 15 minutes riding at a walk and 1.8 minutes at each other speed.
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