What is the unit of velocity ratio and mechanical advantage and why

A golf ball is given an initial speed of 20. meters per second and returns to level ground. Which launch angle above level ground results in the ball traveling the greatest horizontal distance? [Neglect friction.] (1) 60.° (3) 30.° (2) 45° (4) 15°

In each pair, select a substance that is a better heat conductor. 1. copper wire / wood 3. water / iron 2. water / air 4. iron / glass

Identify whether each of the following is a former of mechanical energy: elastic potential energy, chemical potential energy, gravitational potential energy

What did Ernest Reuther fourths gold foil experiment show about the nature of Atoms

When going from an optically less dense medium to a more optically dense medium (such as air to water), how does the angle of incidence compare with the angle of refraction? Does the light bend towards or away from the normal?

The pressure inside a champagne bottle can be quite high and can launch a cork explosively. Suppose you open a bottle at sea level. The absolute pressure inside a champagne bottle is 6 times atmospheric pressure; the cork has a mass of 7.

Using a cathode ray tube, Thomson confirmed that atoms must have an overall positive charge. atoms are made of particles that have a negative charge. electrons in atoms must have varying amounts of energy. electrons are only found in the nucleus.

A ball is rolled along the inside of a partial hoop lying flat on a table. which path will the ball follow when it gets to the end of the hoop?

What pattern of material movement found in the Earth system tracks how an element moves from living to nonliving parts? a. rock cycle b. calcium cycle c. carbon cycle d. none of the above

Why is the monolith el capitan in yosemite national park more resistant to erosion than other igneous plutons in the park?