Why do telescopes give modern astronomers an advantage over people in the past

Which coefficient of O2 is needed to balance the equation C3H8 + O2 → 3CO2 + 4H2O? a. 2 b. 3 c. 5 d. 6

What is the unit for power

In the northern hemisphere the magnetic compass will normally indicate a turn toward the west.

Which element has the fewest valence electrons?

Suppose that you jounce up and down while weighing yourself on a bathroom scale. Which varies: the upward support force or the force of gravity on you? Why is your weight reading best shown when you stand at rest on the scale?

The amount of force needed to keep a 0.1kg basketball moving at a constant speed of 6 m/s on frictionless ice is ___ N

What three forms of kinetic energy can a polyatomic molecule have?

A parachutist bails out and freely falls 50 m. Then the parachute opens, and thereafter she deceler - ates at 2.0 m/s2. She reaches the ground with a speed of 3.0 m/s.

Why the weight of a body decreases with increases in distance from the earth's surface

On a fishing trip Justin rides in a book 12 km south. The fish aren't biting so they go for kilometers west. They then follow a school of fish 1 km north. What distance did they cover? What was their displacement?