A boy throws a rock with an initial velocity of at 30.0° above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory if air resistance is negligibly small and g = 9.80 m/s2?
A) 0.160 s
B) 0.282 s
C) 0.313 s
D) 0.441 s
A
Physics & Space Science
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Power: An ac signal is applied across a 40-mH inductor and a 100-? resistor. If the power factor of this circuit is 0.40, what is the frequency of the ac signal?
A. 160 Hz B. 200 Hz C. 410 Hz D. 600 Hz E. 910 Hz
Physics & Space Science
Supernovae have little effect on the development of planets such as Earth
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
Light from a helium-neon laser (? = 632.8 nm) is incident upon a 0.200-mm-wide slit. Find the total width of the central maximum 2.00 m from the slit.
What will be an ideal response?
Physics & Space Science
A ball rolling down a hill has a constant acceleration of 3 m/s2 . If the ball's mass is 2.5 kg, what is the net force acting on the ball?
Physics & Space Science