1.) How much is the acceleration of a baseball thrown by a pitcher in a major le

Question

1.) How much is the acceleration of a baseball thrown by a pitcher in a major league baseball game if the ball goes from 0 to 80 mph (117.3 ft/s), in a one-half-secong time period?

2.) How long doe it take fro moonlight to reach Earth if the moon is 240,000 miles away) Use 186,000 miles/sec for the speed of light.

3.) If an atom has 8 protons, 8 neutrons, and 8 electrons, what element isits mass, and what is its charge?

a.) Oxygen, 16 amu, no charge

b.) Carbon, 16 amu, +1 charge

c.) Oxygen, 16 amu, -1 charge

d.) Nitrogen, 16 amu, +1 charge

4.) How much kinetic energy does a 2000 kg car have if it is traveling at 20 m/s?

5.) If 2 megajoules of heat are applied to 20 kg of water, how much will the temperature change? Use 4.185 J/g °C for the specific heat of water.

Explanation / Answer

1) 80mph= 35.76meter/sec

this velocity is attained by the ball in 0.5 secs

therefore the acceleration = 35.76/0.5 m/s2 = 71.52 m/s2

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