An blank is an object that allows only some electrons to go through it

The motor of a crane uses power p to lift a steel beam. by what factor must the motor's power increase to lift the beam twice as high in half the time?

All of the following equations are statements of the ideal gas law except

A Lincoln Continental and a Yugo are making a turn. The Lincoln is four times more massive than the Yugo. If they make the turn at the same speed, then how do the centripetal forces acting upon the two cars compare. Explain.

How are step-up transformers used in the transmission of electrical energy? A They decrease the voltage before it leaves a power plant. B They increase the voltage for efficient long-distance transmission.

Which of the following statements proves that scientific knowledge changed due to the discovery of the fossil of a hadrosaur in North Dakota? Hadrosaurs were better runners than earlier thought.

During a collision between a photon and an electron, there is conservation of

To produce change in motion, a force must be a (n) A) balanced force B) unbalanced force C) frictional force D) gravitational force

What is meant when Earth's systems are said to be "dynamic"? they are all the same type they are slow moving they cannot be measured they are constantly changing

Which of the following statements about electrons is FALSE? Group of answer choices the closer an electron is to the nucleus, the more strongly the electron is attracted to the nucleus and therefore the more potential energy the electron has

Match each term to the appropriate definition