2. Products and reactants in a balanced

chemical reaction have the same

number of of each element.

O atoms

O molecules

Indentify the class of lever for which the fulcrum is between the input force and the output force

The engine on a fighter airplane can exert a force

g A 4 cm diameter "bobber" with a mass of 3 grams floats on a pond. A thin, light fishing line is tied to the bottom of the bobber, and from the bottom hangs a 10 gram lead weight. The density of lead is 11.3 g/cm3.

In order to move a wheelbarrow a constant force is exerted. Which of the following will increase its acceleration? A. Increasing the mass of the wheelbarrow B. Decreasing the mass of the wheelbarrow C. Reversing the direction of the wheelbarrow D.

Explain how a mug of tea is heated in a microwave oven. Explain why the tea gets hotter than the mug

Which of the following is not shorthand to describe one of the three types of ecological relationships? +/+ -/+ +/0 -/0

Which is a characteristic of an electromagnetic wave?

What does the ozone layer absorb? a. Microwaves c. UV radiation b. X-rays d. Infra-red radiation

An object is undergoing shm with period 0.900 s and amplitude 0.320 m. at t = 0 the object is at x = 0.320 m and is instantaneously at rest. calculate the time it takes the object to go (a) from x = 0.320 m to x = 0.160 m and (b) from x = 0.

Your friend states in a report that the average time required to circle a 1.0-mi track was 49.325 s. This was measured by timing 10 laps using a stopwatch with a precision of 0.01 s. Do you believe his results are reliable? Explain.