Knowing the definition of work as used by physicists, how can the work done on an object be equal to zero? a. The force and distance are perpendicular. b. The force is zero. c. The distance is zero. d. all of these e. none of these.

The symbols for elements have either

Star formation begins when

The fuzzy cloud around the nucleus is called the

1. A 700kg racecar slowed from 30m/s to 15 m/s. What was its change in Momentum? 2. If the car in the above problem took 5 seconds to slow down from 30m/s to 15 m/s. a. What is the impulse? b. What was the average force applied by the brakes?

If a substance conducts heat easily, it is considered to be a good insulator. bad substance. good conductor. poor conductor.

Which type of galaxy is a spherical cluster of stars with extraordinary brightness and little dust and gas?

When discussing discordant and harmonious sound waves, which statement is false? A. Both types of waves are the result of component waves with different frequencies. B.

6 foot waves carries more energy than a 3 foot waves

Why does a charged balloon stick to a neutral wall?

While the cart is moving along an aisle, it comes in contact with a smear of margarine that had recently been dropped on the floor. Suddenly the friction force is reduced for - 40.0 newtons to - 20.0 newtons.