When a tuning fork vibrates over an open pipe and the air in the pipe st21 to vibrate, the vibrations in

the tube are caused by

A. resonance.

B. reinforcement.

C. harmonics.

D. beats.

How does a concave lens affect rays of light?

In order to be sure a grinder used in production is operating properly, what feature of the grinder should be checked daily?

What is an example of chemical potential energy in humans?

In a typical lightning strike, 2.0 c flows from cloud to ground in 0.24 ms. what is the current during the strike?

Threshold potential refers to the membrane potential required to: A. initiate an action potential and open voltage-gated sodium ion channels. B. initiate an action potential. C. open voltage-gated sodium ion channels. D.

A 25kg object moves from left to right at a speed of 30km/h. What net force is required to keep this object moving in a straight line at constant speed

Ganymede is one of the many moons of jupiter. it is nearly a sperical in shape. it is larger than the planet mercury and slightly smaller than the planet mars.

Which of the following statements about two carts rolling on a track and experiencing a completely inelastic collision is TRUE? a. The kinetic energy of the system is conserved to good approximation. b.

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.