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

Through which one of the following mediums is the velocity of a sound wave the greatest? A. Water B. Steel C. Air D. Lead

Two tiny beads are 25 cm apart with no other charges or fields present. Bead A carries 10 µC of charge and bead B carries 1 µC.

What happens to a bar of metal when its heated?

You suspect that an uninterruptible power supply (UPS) is malfunctioning. You need to test the output from the UPS using a multimeter. Which multimeter setting should you use? A) AC VoltageB) DC VoltageC) Ohms D) Continuity

A space shuttle in orbit around the Earth carries its payload with its mechanical arm. Suddenly, the arm malfunctions and releases the payload. What will happen to the payload? a. It will fall straight down and hit the Earth. b.

What is the speed of a 50 g rock if its de Broglie wavelength is 3.32 x 10?

Leanne is riding a bike. The forward force from her pedalling is 18N. There is a backward force of 6N from friction and a backward force of 12N from air resistance. Does the speed of the bike increase, decrease or not change?

How are energy and speed related

11. Which of the following best explains velocity? A. The direction of an object in motion B. Only the change of direction of an object in motion C. The speed and direction of an object in motion D. The speed of an object in motion

Using 6400 km as the radius of Earth, calculate how high above Earth's surface you would have to be in order to weigh 1/16th of your current weight. Show all work leading to your answer OR describe your solution using 3 - 4 complete sentences.