A baseball is thrown from the outfield toward the catcher. When the ball reaches its highest point, which statement is true? O Its velocity and its acceleration are both zero. Its velocity is not zero, but its acceleration is zero. Its velocity is perpendicular to its acceleration. Its acceleration depends on the angle at which the ball was thrown. O None of the above statements is true.

A baseball is thrown from the outfield toward the catcher. When the ball reaches its highest point, which statement is true? O Its velocity and its acceleration are both zero. Its velocity is not zero, but its acceleration is zero. Its velocity is perpendicular to its acceleration. Its acceleration depends on the angle at which the ball was thrown. O None of the above statements is true.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter3: Motion In Two Dimensions

Section: Chapter Questions

Problem 56P: A person standing at the top of a hemispherical rock of radius R kicks a ball (initially at rest on...

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A person standing at the top of a hemispherical rock of radius R kicks a ball (initially at rest on the top of the rock) to give it horizontal velocity vi as shown in Figure P3.56. (a) What must be its minimum initial speed if the ball is never to hit the rock after it is kicked? (b) With this initial speed, how far from the base of the rock does the ball hit the ground?
A golfer hits his approach shot at an angle of 50.0, giving the ball an initial speed of 38.2 m/s (Fig. P4.60). The ball lands on the elevated green, 5.50 m above the initial position near the hole, and stops immediately. a. How much time passed while the ball was in the air? b. How far did the ball travel horizontally before landing? c. What was the peak height reached by the ball? FIGURE P4.60
A baseball is hit at an angle 0 and travels along a parabolic arc before it strikes the ground. Which one of the following statements is true? O The acceleration of the ball decreases as the ball moves upward. O The velocity of the ball is O when the ball is at the highest point in the arc. O The acceleration of the ball is 0 when the ball is at the highest point in the arc. O The velocity of the ball is a maximum when the ball is at the highest point in the arc. O None of the above.
Which statements are NOT VALID for a projectile? Take upward as positive. The acceleration of the projectile is positive and decreasing when the projectile is moving upwards, zero at the top. and increasingly negative as the projectile descends. OThe projectile has the same x velocity at any point on its path. O The acceleration of the projectile is a constant negative value. The y component of the velocity of the projectile is zero at the highest point of the projectile's path.
For projectile motion without air resistance, which of the following statements is true about the x- and y- components of acceleration? O They are both constant, where the x-component is a positive number and the y-component is the local acceleration due to gravity. none of the given choices O They both change as a function of position along the parabolic path. They are both constant, where the x-component is zero and the y-component is the local acceleration due to gravity. O They both change, but there is insufficient information given.
An object has an acceleration that is directed opposite of its motion. What is true of the object? O It is moving in a circle. O It is slowing down. O It is moving at a constant speed. O It is speeding up. O It is moving vertically. 6 7
O Other: A ball is thrown at an angle of 38° to the horizontal. What happens to the magnitude of the ball's vertical acceleration during the total time interval that the ball is in the air? It decreases, then increases. O It remains the same. It increases, then decreases. O It decreases, then remains the same ndu from a height H. It lands
Which is true for a car moving around a circular track with constant speed? (Select all that apply.) O It has zero acceleration. It has an acceleration directed away from the center of its path. It has an acceleration component in the direction of its velocity. It has an acceleration with a direction that cannot be determined from the information given. O It has an acceleration directed toward the center of its path.
An archer shoots an arrow horizontally and his friend drops a marble from the same height when the arrow is released. In the absence of air resistance, which of the following happens? The arrow hits the ground first. The marble hits the ground first. O Both hit the ground at the same time. You cannot tell from the information given.
You fire a bullet, and drop a second bullet from the same height as the gun's barrel at the exact same time the fired bullet leaves the barrel. Neither bullet encounters any obstructions as they move through the air. Which bullet will strike the ground first? O The fired bullet hits the ground first. O The dropped bullet hits the ground first. O It depends on how much the fired bullet's horizontal velocity is slowed down from air resistance. O They strike the ground at the same time.
A baseball is thrown horizontally from a cliff. At the same instant, a bowling ball is dropped from the same height. Assuming air resistance can be ignored, which of the following statements is correct? O The bowling ball hits the ground first. O Both the bowling ball and the baseball hit the ground at the same time. O The bowling ball has the greater velocity just before it hit the ground. O The baseball has the greater acceleration just before it hit the ground. O The bowling ball has the greater acceleration just before it hit the ground.
If you double the radius of an object in uniform circular motion, how does its centripetal acceleration change? O It decreases by a factor of 2. O It increases by a factor of 2. O It decreases by a factor of 4. O Changing the radius does not affect the centripetal acceleration.