An object is dropped from rest.

What is its instantaneous speed when it has

been in motion for 5 s? The acceleration of

gravity is 9.8 m/s?.

During a thunderstorm, you should crouch under a tree for shelter. a. True b. False

At 2.5 seconds, the helicopter has a kinetic energy of 20 J. What is its mechanical energy at that time?

Which of the following statements is not one of Newton's laws of motion? a. The rate of change of momentum of an object is equal to the net force applied to the object. b.

The vibration produced days or even years before an earthquake

The game is on the line and it's your job to pick one football player to give the ball to run for the winning touchdown. You do not want the opposing team to stop him, therefore, you want the one with the largest momentum.

Which method would you use to find the volume of an irregular shaped object?

A step up transformer has a primary coil with 100 turns and a secondary coil with 25 turns if the input voltage in the primary coil is 40 volts what is the output voltage reduced to in the secondary coil A) 20 volts B) 35 volts C) 4 volts D) 10

An instrument used to measure atmospheric pressure is called a

A 200-kg boulder is 1000-m above the ground. what is its potential energy?

The law of reflection states that if the angle of incidence is 81 degrees, the angle of reflection is ___ degrees.