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A helicopter lifts off at a constant acceleration of upward. What is the height of the helicopter 2.5 s after liftoff?

The fraction of a square kilometer in a square millimeter is

A roller coaster includes a circular vertical loop with radius 16.0 m. For what linear speed at the top of the loop will the passengers feel weightless?

Two forces, one with magnitude 10 N and the other with magnitude 15 N, are directed as shown in the diagram below. What is the magnitude of a third force which would exactly balance these two forces, so that the sum of all three forces would be zero?

A sports utility vehicle has tires which are 110 cm in diameter. If the wheel is rotated through 30 revolutions, how far forward does a point on the tire travel?

A fellow student found in the performance data of his new car the velocity-versus-time graph shown in the figure. The average acceleration of his car from second 0 to second 24 is

The number of centimeters in 2.50 miles is

A mass of 5.00 kg slides on a frictionless surface. This mass is connected to another mass by a massless string over a frictionless pulley. The masses are held motionless and then released. Mass accelerates downward at 4.10 . What is the mass of ?

An elevator, with a total mass of 454 kg, accelerates downward at . During this time, the tension in the elevator cable is

A 65-kg skydiver falls with a terminal velocity of 50 m/s. What is the magnitude of the net force acting on the skydiver?