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Q. A 280 g block on a 50.00 cm-long string swings in a circle on a horizontal, frictionless table at 70 rpm.
What is the speed of the block?
What is the tension on the string?
A small, 300 g cart is moving at 1.60 m/s on an air track when it collides with a larger, 1.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s.
What is the force acting on the board because of the left support when a diver of mass 63.20 kg stands at the end of the board over the water? Suppose that these forces are vertical.
Two boats start together and race across a 56km wide lake and back. Boat A goes across at 56 km/h and returns at 56km/h. Boat B goes across at 28km/h, and its crew, realize how far behind it is getting.
What is the velocity of the boat when it reaches the buoy.
A diffraction grating with 395 lines/mm is 1.00 m in front of a screen. What is the wavelength of light whose first-order maxima will be 16.9 cm from the central maximum on the screen.
A 3.60 {rm m}-long, 430 {rm kg} steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66 {rm kg} construction worker stands at the far end of the beam.
Kelli weighs 417 N, and she is sitting on a playground swing that hangs 0.44 m above the ground. Her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. Imagine that air resistance is negligible.
What is coefficient of friction between chair and floor
A flight attendant pulls her 72-N flight bag a distance of 265-m along a level airport floor at a constant velocity. The force she exerts is 44-N at an angle of 57° above the horizontal.
A 43.0-N child is in a swing that is attached to ropes 1.60 m long. Find the gravitational potential energy associated with the child relative to her lowest position at the following times.
What is least amount of work required by an external force
A playground merry go round of a diameter 6m and mass 240 kg is rotating at 12 rev/min about a frctionless vertical axle. Facing the axle, a 30kg child hops on to the merry go round and manages to sit down on its ledge. What is the new angular spe..
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