An ice sheet 5m thick covers a lake that is 20m deep. what is the temperature of the water at the bottom of the lake? explain your answer. coefficient of volume expansivity at 20 degree centigrade is 2.1x10^-4

A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 23.8 m/s, from a height of 0.

You mix two ionic Solutions after you mix them in a beaker the solution turns cloudy after 5 minutes the solution becomes clear and a white powder has settled on the bottom of your maker is it physical or chemical change

Electrical wiring is commonly composed of metal covered in plastic or rubber coating. Which of these materials is an insulator and which is a conductor?

Which of the following was an effect of the fall of the Gupta empire? A. The Chola took over all of India. B. India became more isolated. C. India united under a new empire. D. India divided into smaller kingdoms.

In order for work to take place the energy present must be related to the movement of the object. a. the force applied must be a balanced force resulting in motion of the object. b. the force applied must cause the movement of the object c.

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