What three things happen when air is warmed?

a) it expands

b) it contracts

c) it becomes lighter

d) it becomes heavier

e) it rises

f) it sinks

Why are concepts in physics described in formulas?

When a box of chocolate bars is in mechanical equilibrium, what can be correctly said about all the forces that act on it?

These can cause electrical problems on earth

The number of significant figures in the measurement 0.000 305 kg is six. two. seven. three.

3. Infer A car is travelling down a straight road. The driver presses on accelerator but the car does not ch speed. How is this possible? esses on the oes not change

Your car travels 600 miles in 6 hours. You stop the car for lunch for 1 hour and then you continue on your trip for another 14 miles and finish the entire trip in 8 hours. What was your car's average speed while you were driving?

Speed is a vector quantity

The observation location A is located at m. The conventional current running through the wire is 7.5 amperes. In this exercise you will calculate the magnetic field at the observation location due only to segment 4 of the wire.

The wavelength of a light wave can be used to measure which of the following? A. The direction the wave is traveling B. How many photons the wave contains C. How much energy the wave has D. How high the top of the wave is

Sound 1 has an intensity of 38 W/m2. Sound 2 has an intensity level that is 2.5 dB greater than the intensity level of sound 1. What is the intensity of sound 2?