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

Name at least three other forms of energy that are formed as a roller coaster travels.

Brass is an alloy made from copper and zinc. A 0.59 kg brass sample at 90.0 C is dropped into 2.80 kg of water at 5.0 C. If the equilibrium temperature is 6.8C, what is the specific heat capacity of brass?

a new high speed rail system uses 6000 horsepower electric cars which get their power from 25 kV overhead wire with resistance 15 ohm. current returns through the track, whose resistance is negligble. what is the maximum range of the train

A car has a 12-v battery. if we hook it up to a 36 ohm resistor, what current will flow?

Driving a motor vehicle requires many coordinated functions which are impacted by alcohol and other drugs

A tennis ball was thrown into the air with a speed of 22.5 m/s. It was caught at the same height above the ground. a. How fast was the ball moving at the peak of its path? b. What was the acceleration on the ball as the ball was moving upward? c.

Which nuclei is not radioactive? A. Am-241 B. Mg-24 C. Pu-241 D. U-238

1. What is the wavelength of a wave that has a velocity of 220 m/s and a frequency of 660 Hz? answer? 2. What is the frequency of a wave that has wavelength of 0.25 meters and a velocity of 250 m/s? answer?

What has a definite ratio of components

Gravity is greater when there is Select one: A. equal mass and more distance between two objects. B. less mass and less distance between two objects. C. more mass and less distance between two objects. D. more mass and more distance between objects.