From Earth, one satellite appears to overtake another. The faster satellite is
A) higher.
B) lower.
C) smaller.
D) can't say
Answer: B
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The filament in a light bulb has a diameter of 0.050 mm and an emissivity e = 1.0
The temperature of the filament is 3000°C. How long should the filament be in order to radiate 60 W of power? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4). A) 11 cm B) 9.4 cm C) 8.6 cm D) 7.2 cm E) 5.9 cm
A 95-N force exerted at the end of a 0.32-m long torque wrench produces a torque of 15 N ? m. What is the angle (less than 90°) between the wrench handle and the direction of the exerted force?
A) 30° B) 24° C) 36° D) 42°
Of the three types of nuclear decay, only __________ does not affect the atomic number of the nucleus
Fill in the blank(s) with correct word
On planet X, the pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2
At a depth 5.00 m below the surface, the pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3. (a) What is the atmospheric pressure at the surface of the lake? (b) What is the acceleration of gravity on planet X?