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.
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Which of the following statements comparing halo stars to our Sun is not true?
A) Most stars in the halo have either died or are in their final stages of life, while the Sun is only in about the middle of its lifetime. B) Most stars in the halo have cooler surface temperatures than the Sun. C) Most stars in the halo are less luminous than the Sun. D) Most stars in the halo contain a much lower percentage of heavy elements than the Sun.
For an rms current of 5.0 amperes determine the maximum and peak-to-peak values
What will be an ideal response?
An electron of mass 9.11 × 10^–31 kg has a momentum of 2.61 × 10^–22 kg·m/s. What is its speed?
a. 0.29c b. 0.72c c. 0.69c d. 0.48c e. It cannot have this momentum since it would require a speed greater than c.
The blue light from the sky has been polarized by:
a. selective absorption. b. reflection. c. double refraction. d. scattering.