Calculate the average speed (in m/s) of a car that travels 50km in 30 minutes.

If you push on the sides of a filled balloon, how does the gas pressure inside the balloon change?

Why do cities located in the west have different climates and temperatures in the east cities?

How can you make the work output of a machine greater than the work input

Electrodes used in arc welding processes are classified as consumable or non - consumable. Filler metal is always added when consumable electrodes are used and never added when non-consumable electrodes are used: a) True b) False

It is observed that the number of asteroids (or meteoroids) of a given diameter is roughly inversely proportional to the square of the diameter.

calculate the force exerted on a rocket given that the propelling gases are expelled at a rate of 1500 kg/s with a speed of 4.0x10^4 (at the moment of take off)

Which of the following statements about electrons is not true? A) Electrons orbit the nucleus rather like planets orbiting the Sun. B) Within an atom, an electron can have only particular energies.

In longitude waves, the medium moves parallel to the direction of energy transport

Thomsonâs experiment is credited with the discovery of which particle?

When you drop a pebble from height h, it reaches the ground with kinetic energy k if there is no air resistance. from what height should you drop it so it will reach the ground with twice as much kinetic energy?