Blog

In order for two waves to interfere completely destructively, they must ________________. Select all that apply. 

A current can be made to flow in a wire if

A baseball with mass 0.14 kilograms and speed 40 m/s is caught. If all of its kinetic energy is converted to heat as it is caught, what is its temperature change? (Assume the baseball’s specific heat capacity is 1,000 joules per kilogram degree Celsius.) (Type your final answer with units in the box below. Show your equation and work on your scratch paper, or include it in the box below.)

As you go higher and higher above the surface of the Earth, the [blankAconstant] of a body stays constant while the [blankBdecreases] of a body decreases.

How tightly the nucleons in a nucleus are bound together is indicated by the nucleus’s

When an object reaches its terminal speed, its acceleration is zero.

A battery in a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 3 ohms. What is the voltage of the battery? (Type your final answer with units in the box below. Show your equation and work on your scratch paper, or include it in the box below.)

Using a lever to move a rock reduces the force a person must exert, while keeping the work done on the rock the same. 

Which of the following is not an example of potential energy?

An aluminum wing on a plane is 38 m long when the temperature is 20oC. At what temperature (in oC) would the wing be 0.04 m shorter? Give your answer to one decimal place. Aluminum has a coefficient of linear expansion of 0.000025 per degree Celsius. (Hint: You are being asked for a temperature, not a temperature change.) (Type your final answer with units in the box below. Show your equation and work on your scratch paper, or include it in the box below.)