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Q. 0.55 kg block of ice is sliding by you on a very slippery floor at 3.5 m/s. As it goes by, you give it a kick perpendicular to its path. Your foot is in contact with the ice block for 0.0025 seconds. The block eventually slides at an angle of 22 degrees from its original direction (labelled in the diagram). The overhead view is approximately to scale. The arrow represents the average force your toe applies briefly to the block of ice.
Q. A loaded ore car has a mass of 950 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 32.0° above the horizontal. The car accelerates uniformly to a speed of 2.05 m/s in 13.0 s and then continues at constant speed.
A loudspeaker of mass 19.0 kg is suspended a distance of = 1.60 m below ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 3.30m . What is the tension in each of the cables.
A helicopter is ascending vertically with a speed of 5.30{rm m/s}. At a height of 120 {rm m} above the Earth, package is dropped from a window.
A 4.80 long, 600 steel beams extends horizontally from point where it has been bolted to the framework of a new building under construction. A 75 construction worker stands at the far end of beam.
suppose that they have same internal energy, which will have a higher temperature: a metal knife in thermal equilibrim with a hot griddle or a 1kg block of ice at -25C or seven 12g ice cubes at -25C.
what are the currents that the block can carry.
A 10 cm long thin glass rod is uniformly charged to +50 nC. A small plastic bead, charged to - 4.8 nC, is 4.2 cm from the center of the rod. What is the magnitude of the force of the bead.
A large wooden turntable in the shape of the flat disk has a radius of 2.00 {rm m} and a total mass of 120 {rm kg}. The turntable is initially rotating at 3 {rm rad}/{rm s} about a vertical axis through its center.
Two carts with masses of 4.5 kg and 3.9 kg move toward each other on a frictionless track with speeds of 5.6 m/s and 4.3 m/s, respectively. The carts stick together after colliding head-on.
A 52kg ballet dancer stands on her toes during a performance with four square inches (26cm2) in contact with the floor. What is the pressure exerted by floor over the area of contact in some cases.
Gillian buys a pendulum clock at a discount store and discovers when she gets it home that it loses minutes each day.
A 12 kg box slides 4.0 {rm m} down the frictionless ramp, and then collides with a spring whose spring constant is 240 N/m.
what is the direction of its velocity relative to the frame of reference.
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