A v vs. t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 5 s the acceleration of the ball is zero. We know that at t = 5 s,

a. the slope of the curve is non-zero.
b. the velocity of the ball is not changing.
c. the curve is not crossing the time axis.
d. the curve is at v = 0, t = 0.


b

Physics & Space Science

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A 1.30-m long gas column that is open at one end and closed at the other end has a fundamental resonant frequency 80.0 Hz. What is the speed of sound in this gas?

A) 104 m/s B) 61.5 m/s C) 26.0 m/s D) 246 m/s E) 416 m/s

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On the H-R diagram, red supergiants like Betelguese lie:

A) at the bottom left. B) at the bottom right. C) at the top left. D) at the top right. E) They can't be plotted, for they are not main sequence.

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Given that a vector extends from the origin to (-5.0 cm, 8.0 cm), find the direction of the vector from the positive x-axis.

A. 32
B. 58
C. 148
D. 122

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