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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?

Given that the formula for Newtonian gravitation is , where F is the force, and are masses, and r is a unit of length. What are the units for the universal gravitational constant G?

Trader Joe’s grocery store uses cables across the road as “traffic counters” to determine the density of traffic near a possible retail store location. This is an example of which research method to collect primary data?