A baseball outfielder throws a baseball of mass 0.15 kg at a speed of 30 m/s and initial angle of 30°. What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction
a. zero
c. 92 J
b. 51 J
d. 120 J
B
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Two astronauts of equal mass are holding on to each other and moving at a speed of 30 m/s. They push off of each other and one of the astronauts moves in the same direction as the two were initially moving but at 60 m/s. The velocity of the second astronaut is
A. 30 m/s forward. B. 60 m/s forward. C. 60 m/s backward. D. zero. E. 30 m/s backward.
A 3.0-kg mass sliding on a frictionless surface explodes into three 1.0-kg masses. After the explosion the velocities of the three masses are: (1) 9.0 m/s, north; (2) 4.0 m/s, 30° south of west; and (3) 4.0 m/s, 30° south of east. What was the magnitude of the original velocity of the 3.0-kg mass?
a. 1.7 m/s b. 1.0 m/s c. 1.3 m/s d. 2.0 m/s e. 2.8 m/s
Which photo shows what we call a first-quarter moon? (Note: Assume these photos were taken in the Northern Hemisphere.)
A) 1 B) 2 C) 3 D) 4
A tuning fork is set into vibration with a frequency of 512 Hz. How many oscillations does it undergo in 1 minute?
A) 30700 B) 8.53 C) 26.8 D) 1610 E) 512