What are the methods of heat transfer?

Whats the rounded Atomic mass of iron?

What force pulls the moon towards the earth?

A 6.5*10-2 kg arrow hits the target at 25 m/s and penetrates 3.8 cm before stopping. A) What average force did the target exert on the arrow? B) What average force did the arrow exert on the target? C) An identical arrow strikes the target at 65m/s.

A stone is dropped from the roof of a high building. a second stone is dropped 1.50 s later. how far apart are the stones when the second one has reached a speed of 13.0 m/s?

A 250 mL sample of nitrogen (N2) has a pressure of 745 mm Hg at 30 C. What is the mass of nitrogen?

Which excited electron has the lowest energy?

A ball on a string is swung at a constant speed of 3m/s in a horizontal circle. if the string is 1.25m long what is the centripetal acceleration of the ball?

A horse trots away from its trainer in a straight line. moving 38 m away in 9.0 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed and average velocity?

Why aren't all atoms radioactive?

Why would the discovery of a fossil imply that earth is much older than originally though?