In a department store an airstream from a hose connected to the exhaust of a vacuum cleaner blows upward at an angle and supports a beach ball in midair. Does the air blow under or over the ball provide support

A boy whirls a stone with uniform speed in a horizontal circle of radius 2 m and at height 2 m above the ground. The string breaks and the stone flies off horizontally and strikes the ground after traveling a horizontal distance of 2 m.

A 45 N girl sits on a bench 0.6 meters off the ground. How much work is done on the bench?

The specialty of an athlete on the women's track team is the pole vault. She has a mass of 48 kg and her approach speed is 8.9 m/s. When she is directly above the bar, her speed is 1.6 m/s.

Which question could Not be answered by using the scientific method? Do black cats eat more than white cats? What am I thinking right now? Which has more calories, soda or milk? Why does the tide change during the day?

A student exerts a force of 500 n pushing a box 10 m across the floor in 4 s. how much work does the student perform?

What are the equations for acceleration and net force?

Which is a diatomic molecule? A. Ar B. CO C. CO2 D. NaCl

A sample of N-type silicon is at the room temperature. When an electric field with a strength of 1000V / cm is applied to the sample, the hole velocity is measured and found to be 2 * 105 cm/sec. a.

Which of the following is a vector quantity? A. 83 ounces of liquid B. 55 km/hr in a truck C. 15 seconds of travel D. 10 m/s down

Which of the following best describes the ultraviolet catastrophe of blackbody radiation? A. As energy is added to an object acting as a blackbody radiator, its emissions move to the ultraviolet part of the electromagnetic spectrum. B.