Which describes a virus?

Viruses produce toxins that damage cells.

Viruses enter host cells to reproduce.

Viruses reproduce best in warm, dark places.

Viruses damage cells indirectly.

Light travels approximately 982,080,000 ft/s, and one year has approximately 32,000,000 seconds. A light year is the distance light travels in one year. State the speed in ft/s, using scientific notation.

To practice Problem-Solving Strategy 25.1 Power and Energy in Circuits. A device for heating a cup of water in a car connects to the car's battery, which has an emf E = 10.0 V and an internal resistance rint = 0.08 Ω.

What do scientists do to share measurement data they can understand?

What is the ratio of the gravitational pull of the sun on the moon to that of the earth on the moon? (assume the distance of the moon from the sun can be approximated by the distance of the earth from the sun.) ?

The speed of light in a medium of refractive index n is ... where c is the speed of light in vaccum

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?

A dc generator is the same as a (n) a. electric motor. b. ac generator. c. armature. d. electric current.

Which of the following best describes scientific knowledge A.) Durable B.) Absolute and never changing C.) Frequently varies