How much physical activity do children and trens need?

A. 50 minutes at least twice a week

B. 50 minutes at least five days a week

C. 150 minutes a week

D 150 minutes at least five days a week

6. The peak value of an AC sine wave is 120 V. What's the effective value (rounded) ? A. 65 V B. 85 V C. 200 V D. 140 V

If three uncharged styrofoam balls are placed together and agitated so that one gains + 3 C of charge and another gains + 4 C of charge, how much charge must there be on the third one?

Samarium has a half-life of approximately 106 billion years. If you found a sample of samarium from the beginning of Earth's history, approximately 4.

What does the kinetic theory say about the motion of atoms

A ball is thrown vertically upward with a speed v. an identical second ball is thrown upward with a speed 2v. how many times higher does the second ball go than the first one?

A stone is thrown vertically upward with an initial speed of 19.3 m/s. Neglect air resistance. The speed of the stone when it is 5.81 m higher is:

A violently rotating column of air is formed around a region of extremely low air pressure above land. Which of these weather conditions is most likely to follow? blizzard cyclone tornado hurricane

How to indicate kinetic energy

During induction, a positively charged rod is brought near to but not touching the electroscope. The presence of the charged object above the plate of the electroscope induces charges to move down into the gold leaves, giving the electroscope an

You are operating a boat with a power ventilation system. you have just fueled this boat. how long should you let the ventilation system run before starting the engine?