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Questions in physics

[Open]A student drops a ball from a window 3.5 meters above the sidewalk. How fast is the ball moving when it hits the ground?

[Open]What three mechanisms may drive tectonic plate movement?

[Open]If you speed up from rest to 12 m/s in 3 seconds, what is your acceleration? A. 4 m B. 4 m/s² C. 36 m D. 36 m/s

[Open]A 1650 kg car accelerates at a rate of 4.0 m/s\(^2\). How much force is the car's engine producing?

[Open]What process allows green plants to control the amount of water stored in their leaves?

[Open]A ball is projected horizontally from the top of a 92.0-meter high cliff with a horizontal speed of 19.8 m/s. Determine the maximum range of the ball.

[Open]A dragster in a race accelerated from rest to [tex]60 \, \text{m/s}[/tex] by the time it reached the finish line. The dragster moved in a straight line and traveled with an acceleration of [tex]8.0 \, \text{m/s}^2[/tex]. How long did it take the dragster to reach the finish line?

[Open]Consider a very low (zero) friction 5.0 kg skateboard on a ramp at an angle of 15 degrees to the horizontal. 1. What would be the net force that causes the acceleration when the skateboard is allowed to move? 2. What would the skateboard's acceleration be down the plane? 3. Now consider the same no-friction skateboard on the same 15-degree ramp. If a 45 kg teenager jumps on, what would be her acceleration down the ramp?

[Open]A shopper in a supermarket pushes a loaded cart with a horizontal force of 13.3 Newtons. The cart has a mass of 25.1 kg and is pushed for 3.60 seconds, starting from rest. (a) How far (in meters) will the cart move during these 3.60 seconds? (Ignore friction.) (b) How far (in meters) will the cart move in the 3.60-second interval if the shopper places her 27.4-N child in the cart before she begins to push it?

[Open]The frequency of a periodic signal is 20 MHz. What is its period?