Why is the mechanical advantage of using a single pulley always 1? Assume there's no friction.

What is her velocity

How many of Jupiter's 67 satellites did Galileo discover?

Explain the theory of Plate Tectonics. b) How does it account for the Mid-Atlantic Ridge? c) How does it account for volcanic island chains like Hawaii?

The density of air on the Earth decreases almost linearly with height from 1.22kgm-3 at sea level to 0.74 kgm-3 at an altitude of 5000m. Atmospheric pressure at the Earth's surface on a particular day is 100000Pa.

Explain how resource availability can affect the stability of a society

At what temperature did the substance in the test tube into a solid?

What occurs when the velocity of Earth is doubled? a. The orbit of Earth around the Sun becomes smaller b. The orbit of Earth does not change c. The Earth escapes the Sun d. The orbit becomes more elliptical

When is a body said to be at rest

27. Calculate the impulse when an average force of 10 N acts on a cart for 5.0 s.

A boy on a bicycle is resting at the top of a hill then he rides his bicycle down the hill describe how the boy potential and kineti energy differ at the top middle and bottom of the him