Explain why the speed of a sled increases as it moves down a snow covered hill even though no one is pushing on the sled

A 380-N girl walks down a flight of stairs son that she is 2.5 m below her starting level. What is the change in the girl's gravitational potential energy?

on a side and 27 km deep and that the rock has an average mass density of 2790 kg/m3. The continent is moving at the rate of about 3.8 cm/year. What is the mass of the continent

What are the characteristics of S waves? A. They are slower than P waves and cause rocks to move from side to side. B. They are fast and cause rocks to move from side to side. C.

These mystery elements are at the top of their families on the periodic table. An element that is in the same family as element C is likely to have which properties?

Which element was discovered by joseph priestley to be what his contemporaries called ""dephlogisticated air""?

Power=170 watts time=20 seconds

What is the charge of alpha, beta and gamma rays?

A pair of scissors is a complex machine. what simple machines make up a pair of scissors?

Methane gas absorbs red light, and methane clouds reflect blue light, giving Uranus and Neptune their distinctive blue colors. Why do Uranus and Neptune have methane clouds, but Jupiter and Saturn do not

A car traveled 1025 kilometers from El Paso to Dallas in 13.5 hours. What was it's average velocity?