Real world efficiency are generally very high in the 90 percent range, true or false?

You notice the flagpole at school vibrating in the breeze. You count the vibrations and find that the flagpole makes 20 complete vibrations in 10 seconds.

A college student throws a ball at his roommate's head every time the phone rings. After a while, the roommate begins to flinch involuntarily at the sound of the phone. In this example, getting hit by the ball is the:

What should you do if the high power objective lens touches or breaks the cover slip?

Write the scientific notation in numerals. 5 x 10^3

A cyclist rides in a circle with speed 8.1 m/s. What is his centripetal acceleration if the circle has a radius of 27 m? A. 3.3 m/s^2 B. 2.4 m/s^2 C. 0.3 m/s^2 D. 1.8 m/s^2

Which of the following statements is true? A. Both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction. B. Nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not. C.

A star may form a black hole once it cannot?

Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip. Which best describes Kai's roundtrip?

The engine that powers a crane burns fuel at a temperature of 1500 oC. It is cooled by air at a temperature of 20 oC. The crane is used to lift a 1000 kg steel girder 30 m into the air.

The portion of a light ray that falls on a surface is a/an