What is the recommended amount of time that a teenager should be participating in physical activity

A: 30 min

B: 60 min

C: 45 min

D: 15 min

Select the statement that correctly describes how light travels? A. Light can travel in a vacuum, and its speed is constant even if the light source is moving. B.

What is ten thousand more than 300,000 + 90,000 + 5,000 + 40 is

Explain why the bright spectral lines of light emitted from the atoms of an element are unique to that element

Which of the following correctly describes a gas A. The particles do not move B. the particales are closely locked in position and can only vibrate c. the particles are free to move independently, colliding frequently. And why

The rubbing of one obejct or surface aganist another

Why does the percentage of water vapor vary?

A situation that restricts something

Why is the sky blue all the time

Where did the rotational kinetic energy of the earth come from?

What is the mass in kg of a leopard in a tree if the tree branch is 36 m up and the leopard's gravitational potential energy is 29988 J?