What Is the Force That a Baseball Pitcher Must Apply

question 47

Multiple Choice

What is the force that a baseball pitcher must apply to a 145 g baseball over a distance of 2.2 m to give it a speed of 144 km/hr when the ball is released? Assume that the force is constant.

• A)25.8 N
• B)52.7 N
• C)109 N
• D)115 N
• E)127 N

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Definitions:

Brain Waves

The patterns of electrical activity in the brain, measured by EEG, that are indicative of different states of consciousness.

Volts

The unit of electric potential and electromotive force in the International System of Units, symbolized as V.

Amperes

The unit of electrical current in the International System of Units (SI); it is a measure of the amount of electric charge passing a point per unit time.

Selective Attention

The cognitive process of focusing on a particular object or task in the environment while ignoring other irrelevant information.