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

All waves carry energy true or false?

The local news team is tracking the storm and has reported that it is traveling north northwest at 20 mph the reporter has told us that the storms

The current in a wire varies with time according to the relationship 1=55A - (0.65A/s2) t2. (a) How many coulombs of charge pass a cross section of the wire in the time interval between t = 0 and t = 7.

You have a small tank of water. Suppose you make waves in the tank, and measure their speed in different depths of water. Which is the independent variable, and which is the dependent variable?

What is the first step a scientist usually take to solve a problem?

When the velocity of a mass on a spring is zero, the acceleration is at

Which is a disadvantage of using wind as an energy source? Check all that apply. It may be unreliable. It is not naturally occurring. It produces a lot of waste. It requires wires to carry electricity. It generates large amounts of electricity.

One step in the production of hydroelectric power involves

A pot is heated on a stove. The water begins to boil rabidly. Which explains why the water is boiling fast?

A galvanometer can be calibrated to read electric A) current B) Voltage C) either of these D) neither of these