Have you heard an ambulance, police car, or fire truck recently? Did you notice that the pitch of the siren changed as it approached you and then again as it moved away? What concept explains this change or shift in sound waves?

What is the mass, in grams, of 2.90*10-3 mol of ammonium phosphate?

A block of mass m = 1.5 kg is released from rest at a height of H = 0.81 m on a curved frictionless ramp. At the foot of the ramp is a spring whose spring constant is k = 250.0 N/m. What is the maximum compression of the spring, x?

What is the approximate weight of a 400 kg object?

The effect of friction :

In a Little League baseball game, the 145 g ball enters the strike zone with a speed of 17.0 m/s. The batter hits the ball, and it leaves his bat with a speed of 24.0 m/s in exactly the opposite direction.

In a classic carnival ride, patrons stand against the wall in a cylindrically shaped room. once the room gets spinning fast enough, the floor drops from the bottom of the room!

What does Newton's law of universal gravitation say about the distance between objects?

Direction of current in a solenoid depends on the direction of magnetic field

What is your mass in kilograms?

Why is it useful for pairs of DNA to be held together by men bonds and not covalent bonds?