A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 5.85 s. What was the height from which the ball was dropped? (g = 9.80 m/s2 and assume air resistance is negligible)
a. 1.88 × 10^2 m
b. 1.68 × 10^2 m
c. 1.38 × 10^2 m
d. 3.36 × 10^2 m
b
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Series/Parallel Circuits: The following three appliances are connected in parallel across an ideal 120-V dc power source: 1200-W toaster, 650-W coffee pot, and 600-W microwave. If all were operated at the same time what total current would they draw from the source?
A. 4.0 A B. 5.0 A C. 10 A D. 20 A
The interior of a refrigerator has a volume of 0.600 m3. The temperature inside the refrigerator in 282 K, and the pressure is 101 kPa. If the molecular weight of air is 29 g/mol,
what is the mass of air inside the refrigerator? The ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K. A) 560 g B) 500 g C) 750 g D) 270 g E) 140 g
A proton with mass 1.67 × 10^-27 kg moves in an accelerator with speed of 0.900c. What is its kinetic energy? (c = 3.00 × 10^8 m/s)
a. 1.95 × 10^-10 J c. 3.70 × 10^-10 J b. 1.00 × 10^-10 J d. 1.35 × 10^-10 J
The conditions required for a lunar eclipse are
A) (1) the phase of the Moon must be new; (2) the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. B) (1) the phase of the Moon must be full; (2) the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. C) (1) the phase of the Moon can be either new or full; (2) the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. D) (1) the phase of the Moon must be new; (2) the Moon must be located at the nearest point in its orbit around Earth. E) (1) the phase of the Moon must be full; (2) the Moon must be located at the nearest point in its orbit around Earth.