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At t = 0, a stone is dropped from the top pf a cliff above a lake. Another stone is thrown downward 1.6s later from the same point with an initial speed of 32m/s. Both stones hit the water at the same instant. Find the height of the cliff.
If the boat driver wishes to land the boat at a dock on the other side of the river directly oppistie his starting position, Which direction should the boat driver point his boat
It has been suggested that rotating cylinders about 10 mi long and 5.0 mi in diameter be placed in space and used as colonies. What angular speed should such a cylinder have so that the centripetal acceleration at its surface equals the free-fall ..
Suppose a 5.40 m diameter telescope were constructed on the Moon, what minimum separation between two objects
a 4kg mass is on the end of a 80 cm long cord. the mass is pulled to an angle of 35 degrees from the vertical and then
An air duct in a building has a radius of 8 cm and a length of 17 m. What pressure is required to push air through the duct at a flow rate of 1.1 m3/s
when 170 v is applied across a wire that is 7.7 m long and has a 0.25 mm radius the magnitude of the current density is
Two bicycle tires are set rolling with the equivalent initial speed of 5.0 m/s along a long, straight road, and distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40 {rm psi} and goes the dist..
A 1320-kg car is moving due east with an initial speed of 25.3m/s. After 11.5 s the car has slowed down to 15.2 m/s. Find the magnitude of the net force that produces the deceleration.
A 66-N m torque acts on a wheel with a moment of inertia 175 kg m2. If the wheel starts from rest, explain how long will it take the wheel to make one revolution?
A stationary motion detector sends sound waves of 0.7 MHztoward a truck approaching at a speed of 55.0 m/s. What is the frequency of the waves reflected back to the detector
A 2.50 kg block hangs from a spring. A 420 g body hung below the block stretches the spring 2.90 cm farther. (a) What is the spring constant? (b) If the 420 g body is removed and the block is set into oscillation, find the period of the motion.
in reaching her destination a backpacker walks with an average velocity of 1.30 ms due west. this average velocity
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