Free Fall: A foul ball is hit straight up into the air with a speed of 30 m/s, and air resistance is negligible.(a) Calculate the time required for the ball to rise to its maximum height.(b) Calculate the maximum height reached by the ball above the point where it hit the bat.(c) Determine the times at which the ball passes a point 25 m above the point where it was hit by the bat.(d) Explain why there are two answers to part (c).

What will be an ideal response?


(a) 3.1 s (b) 46 m (c) 1.0 s and 5.1 s (d) One value for the ball traveling upward; one value for the ball traveling downward.

Physics & Space Science

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What will be an ideal response?

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Which of the following statements comparing halo stars to our Sun is not true?

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An electron of mass 9.11 × 10^–31 kg has a momentum of 2.61 × 10^–22 kg·m/s. What is its speed?

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Physics & Space Science

The blue light from the sky has been polarized by:

a. selective absorption. b. reflection. c. double refraction. d. scattering.

Physics & Space Science