John throws a rock down with speed 11 m/s from the top of a 25-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the rock's speed just as it hits the ground?
a. 19 m/s
b. 25 m/s
c. 610 m/s
d. 22 m/s
e. 12 m/s
b
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A 120-g rubber ball is thrown with a speed of 10 m/s at an oncoming 900-kg car which is approaching at 30 m/s, and undergoes a one-dimensional elastic collision with the car. What is the speed of the ball after the collision?
A) 10 m/s B) 30 m/s C) 40 m/s D) 50 m/s E) 70 m/s
Work-Energy Theorem: The horizontal force that an animal exerts on a large fruit it has found is observed and is shown in the graph in the figure. If the fruit was initially sliding on the frictionless ground at 5.5 cm/s when the animal first grabbed it, by how much did the animal change its kinetic energy during this encounter?
A. 12.5 J B. 50 J C. 25 J D. 22 J E. 0 J
What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
A) gravitational force and outward pressure B) gravitational force and surface tension C) the strong force and the electromagnetic force D) the strong force and the weak force
Three devices that use electromagnetic induction in their operation are generators, transformers, and dynamic microphones
a. True b. False Indicate whether the statement is true or false