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A one pound weight is released 3 feet off the ground. At the same time a two pound weight is released 5 feet off the ground. When will the two weights have the same altitude? Assume no air friction.
Certain neutron stars (extremely dense stars) are believed to be rotating at about 1000 rev/s. If such a star has a radius of 11 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation?
Two blocks are connected by a lightweight, flexible cord that passes over a frictionless pulley. If m1 is 3.7 kg and m2 is 9.0 kg, and block 2 is initially at rest 140 cm above the floor, how long does it take block 2 to reach the floor.
An elderly sailor is shipwrecked on a desert island, but manages to save his eyeglasses. What is the magnifying power of the telescope he can construct with these lenses
A 0.144 kg baseball leaves a pitcher's hand at a speed of 22.5 m/s. If air drag is negligible, how much work has the pitcher done on the ball by throwing it
question an object moves at a constant velocity of 11 ms to the southwest for an inverval of 20 s. halfway through this
Water (? = 1000 kg/m3) is flowing smoothly through a pipe of diameter of 5.0 cm at a speed of 0.25 m/s. Find the pressure in the upper segment of the pipe
Two metal rods, one silver and the other gold, are attached to each other. The free end of the silver rod is connected to a steam chamber, How much heat flows through the two rods in 60 s
Black smokers are hot volcanic vents that emit smoke deep in the ocean floor. Many of them teem with exotic creatures, and some biologists think that life on earth may have begun around such vents.
A batter strikes a baseball moving horizontally towards him at 15 m/s. This ball leaves the bat horizontally at 24 m/s, find the average acceleration while being hit by the bat
A parallel-plate air capacitor of capacitance of 270 pF has a charge of magnitude 0.140 µC on each plate. The plates are 0.306 mm apart. What is the area of each plate? What is the surface charge density on each plate? What is the potential dissimil..
the power supplied to a typical black-and-white television set is 94 w when the set is connected to 120 v. a how much
A hypodermic needle consists of the plunger of circular cross-section that slides inside a hollow cylindrical syringe. When the plunger is pushed, the contents of syringe are forced through a hollow needle.
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