In refraction, when a wave travels from one medium to another, it

A. changes speeds.

B. stays in step.

C. always moves in the same direction.

D. travels in the opposite direction.

At what rate should the blades of the offshore turbine rotate if the speed at the tip is to be the same as that of the turbine on land?

Which air mass would produce cold dry weather in the winter?

the force that is exerted when a shopping cart is pushed. the forces that causes a metal ball to move toward a magnet

A 0.50-kg mass is placed on the end of a vertical spring that has a spring constant of 75 N/m and eased down into its equilibrium position. (a) Determine the change in spring (elastic) potential energy of the system.

When water droplets in a cloud combine become too heavy and fall to the ground you are experiencing?

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?

The hinge at A and cable BDC support beam ABC. Cable BDC passes over the pulley D that is pinned to the ceiling. (Assume that the + x-axis is to the right and the + y-axis is up along the page.

The "zone of avoidance" a) Accounts for the absence of any planet between the orbits of Mars and Jupiter Prevents collisions between planets in the Solar System.

Electric current is ...