Define physical change and chemical change, and give examples of each type of change.

Which of the following are true? Check all that apply. (1) If the net electric field at a particular location inside a piece of metal is zero, the metal is not in equilibrium. (2) The net electric field inside a block of metal is zero under all circumstances. (3) The net electric field at any location inside a block of copper is zero if the copper block is in equilibrium. (4) The electric field from an external charge cannot penetrate to the center of a block of iron. (5) In equilibrium, there is a net flow of mobile charged particles inside a conductor.

A 1000 kg satellite and a 2000 kg satellite follow exactly the same orbit around the earth. a. What is the ratio F_1/F_2 of the gravitational force on the first satellite to that on the second satellite? b. What is the ratio a_1/a_2 of the acceleration of the first satellite to that of the second satellite?

In triangle ABC, $\hat{\mathrm{A}}=15^{\circ}, \hat{\mathrm{B}}=63^{\circ}$ and AB = 10 cm. Find the length of BC.

Graph the set

$$\left\{-2,-\frac{1}{2},|-2|, 2 \frac{1}{2}, 2^{2}\right\}$$

on a number line.

Indicate whether each of the following describes a gas, a liquid, or a solid: The particles in a tank of oxygen are very far apart.

Write each set by listing its elements. {z|z is an integer less than or equal to 4}

Write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true. ____ With all the questions raised about GM agriculture, the wider use of biotechnology has been blocked.

Recommend ways in which eutrophication can be reduced in waterways.

Classify each of the following mixtures as homogeneous or heterogeneous: peanut butter sandwich

List the important things to consider when choosing an OTC medicine.

What channels of transportation are used to deliver your favorite products to you?

Infer why there is more species diversity in southern Florida than there is in northern Alaska.

To what does collusion refer?