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A 50 g mass hanger hangs motionless from a partially stretchedspring. When a 55 gram mass is added to the hanger, the springstretch increases by 8 cm. What is the spring constant of the spring (in N/m)? (Assume g = 9.79 m/s2.)
At what speed do a bicycle and its rider, with a combined mass of 98 kg, have the same momentum as a 1350 kg car traveling at 4 m/s?
a what is the kinetic energy in joules of an 850-lb motorcycle moving at 66 mph?b by what factor will the kinetic
On a swing, a 37 kg girl undergoes small-amplitude oscillations with period 4.1 s. How long are the ropes that support the swing
A man stands on a frictionless platform that is rotating with an angular speed of 2.3 rad/s; his arms are outstretched and he holds a weight in each hand. what is the resulting angular speed of the platform
the average density of a fish can be found by first weighing it in air and then finding the scale reading for the fish
a certain toaster has a heating element made of nichrome wire. when the toaster is first connected to a 110-v source
What is the electric potential energy of an electron at the negative end of the cable, relative to the positive end of the cable? In other words, assume that the electric potential of the positive terminal is 0V and that of the negative terminal i..
two blocks each of mass 3.05 Kg are fastened to teh top of an elevator. A if the elevator has an upward acceleration a = 1.60 m/s^2, What is the maximum acceleration can the elevator have before the upper string breaks
On a cold winter's day heat leaks slowly out of a house at the rate of 25.0kW. find the rate of entropy increase
A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm. Liquid flows through the first segment at a speed of 9.0 m/s. What is the speed in the second segment
A hockey puck impacts a goalie's plastic mask horizontally at 118 mph and rebounds horizontally off the mask at 50mph. with what speed will the goalie move
a ball is thrown directly downward with an initial speed of 6.95 ms from a height of 28.5 m. after what interval does
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