A ball is projected upward at time t = 0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is if air resistance is negligible
The time when the ball strikes the ground is closest to
A) 9.4 s
B) 9.0 s
C) 8.7 s
D) 9.7 s
E) 10 s
Answer: A
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Two speakers in an automobile emit sound waves that are in phase at the speakers. One speaker is 40 cm ahead of and 30 cm to the left of the driver's left ear. The other speaker is 50 cm ahead of and 120 cm to the right of the driver's right ear. Which of the following wavelengths is(are) in phase at the left ear for the speaker on the left and the right ear for the speaker on the right?
a. 10 cm b. 20 cm c. 650 cm d. All of the wavelengths listed above. e. Only the wavelengths listed in (a) and (b).
If two electrons in an atom have the same energy, then they must have the same four quantum numbers
A) True B) False C) They cannot both have the same energy.
A student adds two displacement vectors that have the magnitudes of 12.0 m and 5.0 m. What is the range of possible answers for the magnitude of the resultant vector?
What will be an ideal response?
The actual amount of time it takes for Earth to rotate 360° on its axis is called a
a. meridian day. b. 24-hour day. c. sidereal day. d. mean solar day. e. solar day.