In any good experiment, the scientist needs to (fill in the blank) the hypothesis.

What happens when a rubber balloon is rubbed against wool and gains electrons? A. A positive charged is induced on the balloon and the wool acquires a negative charge. B.

Which has more momentum, a heavy truck moving at 30 miles per hour or a light truck moving at 30 miles per hour?

What is the average intensity of the wave after it passes through polarizer b?

You are located in New York, NY, United States. Your friend is located in Panama City, Panama. You see a waning gibbous in your clear night sky. What phase, if any, will your friend see if the night sky in Panama City is also clear?

What is matter? explain and give example

All matter we encounter in everyday life exists in one of three physical formss True or False.

15 grams of liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change?

A Car is lifted a certain distance in a service station and therefore has potential energy relative to the floor. if it was lifted twice as high, how much potential energy would it have?

How long does it take a 750-w coffeepot to bring to a boil 0.75 l of water initially at 11°c? assume that the part of the pot which is heated with the water is made of 280 g of aluminum, and that no water boils away?

An electric motor rotating a workshop grinding wheel at a rate of 151 rev/min is switched off. Assume constant angular deceleration of magnitude 2.23 rad/s 2. Through how many revolutions does the wheel turn before it finally comes to rest