As a high-altitude balloon rises higher into the atmosphere, it undergoes a decrease in
A) volume.
B) density.
C) weight.
D) mass.
E) none of the above
Answer: B
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Pressure in a Liquid: A circular window 30 cm in diameter in a submarine can withstand a net maximum force of 5.20 × 105 N without damage. What is the maximum depth in a fresh-water lake to which the submarine can go without damaging the window? The density of fresh water is 1000 kg/m3.
A. 680 m B. 740 m C. 1200 m D. 750 m
An 80-km/h airplane flying against a 10-km/h head wind has a groundspeed of
A) 10 km/h. B) 70 km/h. C) 80 km/h. D) 90 km/h.
The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the power emitted by the source?
A) 2.1 × 10-8 W B) 2.7 × 10-7 W C) 2.1 × 10-6 W D) 2.7 × 10-5 W
A 6.00-mC charge is placed at the origin and a second charge is placed on the x axis at x = 0.300 m. If the resulting force on the second charge is 6.40 N in the negative x direction, what is the force on the charge at the origin?
a. 6.40 N in the negative x direction b. 0 N c. 6.40 N in the positive x direction d. not able to be determined until the second charge is known