Author: Anonymous

A submarine sends a sonar pulse underwater. The pulse hits an underwater cliff and returns after 4 seconds. If the speed of sound in water is 1480 m/s, how far away is the cliff?

A wave has a wavelength of 2.0 m and oscillates 3 times every second. Determine the speed of the wave.

A candle is placed 30 cm in front of a concave mirror. A real image of the candle is formed 60 cm in front of the mirror. Determine the focal length of the mirror.

A child’s swing moves back and forth at a steady rate of 5 times every second. Determine the period of one complete swing.

There are 3 resistors in series: R1=30 Ohm, R2=15 Ohm, and R3=10 Ohm. Determine the equivalent resistance. 

A 1200-kg truck is moving at 15 m/s and comes to a stop in 6 seconds. What is the average braking force acting on the truck?

A hockey puck of mass 0.2 kg is sliding on ice at 15 m/s. A player stops it by catching it with the stick. Determine the impulse delivered to bring the puck to rest.

A 60-kg student jumps off a platform 8 meters above the ground. Assuming negligible air resistance, what is the kinetic energy of the student just before hitting the ground?

A rock is dropped from rest and falls freely under gravity. Calculate the distance the rock falls in 3.0 s. g=10 m/s2

Why is the battle at Lexington and Concord called “the shot heard ’round the world”?