What causes lightning? a. thunder c. rising warm air b. an electric discharge d. air masses meeting

In order for a sound wave to travel, it must have ___?

Two bricks of the same mass are each on ledges. Brick 1 is 100 feet high and Brick 2 is 300 feet high. Brick 2 has: 1. zero times more potential energy 2. two times more potential energy 3. three times more potential energy 4.

Which waves can travel through a vacuum? A) light waves Eliminate B) ocean waves C) sound waves D) mechanical waves

A plants root system is which level of organization

A motorcycle moving at 13.2 m/s increases in speed to 25.7 m/s over a period of 8.6 s. If the motorcycle's mass is 352 kg, what net force in Newtons acts on the motorcycle?

What are the units of speed or velocity

List the colors of visible light in order of decreasing frequency physics

You can identify a pure substance if you know it's?

A rod of mass M and length L can rotate about a hinge at its left end and is initially at rest. A putty ball of mass m, moving with speed V, strikes the rod at angle θ from the normal and sticks to the rod after the collision.

A satellite with a mass of 2,000 ㎏ is inserted into an orbit that is twice the Earth' s radius. W hat is the force of gravity on the satellite? The radius of the Earth is 6380 km, and the mass of the Earth is 5.98 X 1024 kg a. 2,000 N h.