A boy throws a rock with an initial velocity of at 30.0° above the horizontal. If air resistance is negligible, how long does it take for the rock to reach the maximum height of its trajectory?
A) 0.110 s
B) 0.194 s
C) 0.215 s
D) 0.303 s
Answer: A
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From observations made of Uranus, scientists have discovered that belt-zone circulation is dominated by what planetary characteristic?
a. rotation b. orbital period c. direction of sunlight d. atmospheric elements e. interior heating
When a mass of 0.350 kg is attached to a vertical spring and lowered slowly, the spring stretches 12.0 cm. The mass is now displaced from its equilibrium position and undergoes simple harmonic oscillations. What is the period of the oscillations?
A) 0.695 s B) 0.483 s C) 0.286 s D) 0.0769 s E) 1.44 s
The symbol indicating the mass number of a nucleus is A
a. True b. False Indicate whether the statement is true or false
The pressure on the lower surface of the cylinder is 20 kPa. If the variation of pressure in the vertical direction is given by ?p/?z = ?2400 Pa/m, the pressure on the upper surface is nearest:
(A) 19.52 kPa
(B) 20.48 kPa
(C) ?28.0 kPa
(D) 31.20 kPa