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Chapter 3: Q7. (page 68)

You are riding in an enclosed train car moving at 90 km/h. Where will the baseball land if you throw it straight upward?

(a) In front of you

(b) Behind you

(c) On your hand

(d) Can鈥檛 be decided from the given information

Short Answer

Expert verified

The baseball will land in your hand.

Step by step solution

01

Step 1. Meaning of uniform velocity

The uniform velocity may be defined as an object's velocity when the object is traveling at equal velocities in equal time intervals.

In the case of uniform velocity, the object's velocity increases or decreases at the same rate.

02

Step 2. Meaning of inertial frame of reference

In an inertial frame of reference, the position of an object is stationary. The car is moving at a uniform speed, and the acceleration of the car is zero. The position of the ball depends on the velocity of the train.

If the horizontal component of the velocity remains constant, the ball will cover the same horizontal distance as the person. The car can be considered an inertial frame of reference.

Therefore, it has the chance to come back directly on your hand. A person covers the horizontal distance at the same time as the ball travels up and down.

Thus, option (c) is the correct answer.

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Most popular questions from this chapter

A projectile is fired with an initial speed of36.6m/sat an angle of42.2oabove the horizontal on a long, flat firing range. Determine (a) the maximum height reached by the projectile, (b) the total time in the air, (c) the total horizontal distance covered (that is, the range), and (d) the speed of the projectile 1.50 s after firing.

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FIGURE 3-35

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FIGURE 3-39Problem 32

One car travels due east at40km/h, and a second car travels north at40km/h. Are their velocities equal? Explain.

Which of the following statements are not valid for a projectile? Take the upward direction as positive.

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(b) The acceleration of the projectile is positive and decreasing when the projectile is moving upward, zero at the top, and increasingly negative as the projectile descends.

(c) The acceleration of the projectile is a constant negative value.

(d) The y component of the velocity of the projectile is zero at the highest point of the projectile鈥檚 path.

(e) The velocity at the highest point is zero.
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