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At a dock, a crane lifts a 1200 kg container 30 m, swings it out over the deck of a frieghter, and lowers the container into the hold of the freighter, which is 10 m below the level of the dock. The acceleration of gravity is 9.8 m/s2. Neglect friction losses. How much work is done by the crane on the container? Answer in units of kJ.
A harmonic wave travels in a wire with amplitude 6.05 mm, wavelength 0.451 m, and frequency 462 Hz. What is speed with which the wave travels.
Compute gauge pressure of the flowing water
A 1040 kg car carrying four 80 kg people travels over a rough "washboard" dirt road with corrugations 2.0 m apart that causes the car to bounce on its spring suspension. The car bounces with maximum amplitude as its speed is 21 km/h. The car now stop..
Approximately how many atoms make up our planet? For simplicity, suppose the average atomic mass of the atoms is 14 . Avogadro's number gives the number of atoms in a mole.
Let us use the uncertainty principle to (very roughly) estimate the size of a hydro- gen atom. Picture the hydrogen atom as an electron orbiting a proton at close to the speed of light.
A meter stick with a mass of 89.5 g is being supported at the 50 cm mark with a pivot that is 1.00 cm above the center of mass of the meter stick. The moment of inertia of stick about that point is 0.00746 kgm^2. What is the period of oscillation ..
A spool of thread has an average radius of 1- cm. If the spool contains 62.8 m of thread, how many turns of thread are on the spool.
A large tanker truck can carry 30 ton (30,000 lb) of liquid. (a) What volume of water can it carry? (b) What volume of gasoline can it carry.
A 40-kg pole vaulter running at 14 m/s vaults over the bar. Her speed while she is above the bar is 1m/s. Avoid air resistance, in addition to any energy absorbed by the pole, and determine her altitude as she crosses the bar.
A 6.4kg ball, hanging from the ceiling by a light wire 135cm long, is struck in an elastic collision by a 1.80 ball moving horizontally at 4.20 m/s just before the collision. Find the tension in the wire just after the collision.
A person pulls a toboggan for a distance of 40m along the snow with a rope directed 25 degrees above the snow. The tension in the rope is 83N.
Calculate the pressure at the center of pipe A. Suppose T = 10?C.
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