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题目

多项选择题

Question at position 2 Question: In this lab, which equipment, methods, or physical principles will you use to deduce the ball's launch velocity? Select all true statements. I will use a ballistic pendulum and principles of momentum and energy.I will use a photogate and approximate the velocity with constant-velocity kinematics.I will use a ruler to measure the ball's impact distance into the pendulum's catcher and principles of inelastic collisions.I will use a meter stick to measure the ball's range and assume projectile motion models the ball's free-flight motion.I will use a caliper to measure the spring launcher's compression and the concept of elastic potential energy.I will use a motion sensor to measure the ball's launch velocity directly.None of the above statements are true.

选项

A.I will use a ballistic pendulum and principles of momentum and energy.

B.I will use a photogate and approximate the velocity with constant-velocity kinematics.

C.I will use a ruler to measure the ball's impact distance into the pendulum's catcher and principles of inelastic collisions.

D.I will use a meter stick to measure the ball's range and assume projectile motion models the ball's free-flight motion.

E.I will use a caliper to measure the spring launcher's compression and the concept of elastic potential energy.

F.I will use a motion sensor to measure the ball's launch velocity directly.

G.None of the above statements are true.

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标准答案

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思路分析

To approach this question, I will evaluate each statement in light of what is typically used in a lab to deduce launch velocity, and distinguish which methods are appropriate for the described setup. Option 1: 'I will use a ballistic pendulum and principles of momentum and energy.' This is a classic approach for determining launch velocity when a projectile transfers momentum to a pendulum mass. By measuring the pendulum’s rise (or the angular displacement) after impact and applying conservation of momentum during the inelastic collision, followed by energy considerations, one can back-calculate the initial velocity of the ball. It is a valid and commonly used method in introductory physics labs. Option 2: 'I will use a photogate and approximate the velocity with constant-velocity kinematics.' A photogate can provide a precise time interval as the ball passes through a light beam. If the setup places the phot......Login to view full explanation