A baseball (0.145 kg, circumference 229 mm) is held completely under sea water (density, 1017 
by the application of what force?
A. 0.21 N
B. 0.49 N
C. It requires no additional force to remain completely submerged.
D. 0.061 N
E. 0.145 N
D. 0.061 N
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A firecracker breaks up into several pieces, one of which has a mass of 200 g and flies off along the x-axis with a speed of 82.0 m/s. A second piece has a mass of 300 g and flies off along the y-axis with a speed of 45.0 m/s
What are the magnitude and direction of the total momentum of these two pieces? A) 361 kg?m/s at 56.3° from the x-axis B) 93.5 kg?m/s at 28.8° from the x-axis C) 21.2 kg?m/s at 39.5° from the x-axis D) 361 kg?m/s at 0.983° from the x-axis E) 21.2 kg?m/s at 56.3° from the x-axis
A solid state pulsed laser has an energy of 400 mJ per pulse. If its wavelength is 1.06 × 10^?6 m, how many photons are in each pulse?
a. 2 × 10^25 b. 2 × 10^21 c. 3 × 10^18 d. 6 × 10^38 e. 2 × 10^18
Which of the following statements is true?
A. electric field lines stay inside equipotent surfaces B. equipotent surfaces intersect in straight lines C. equipotent surfaces intersect in curved lines D. electric field lines are perpendicular to equipotent surfaces E. equipotent surfaces are parallel to each other
More than 2000 years ago, Hipparchus compared the positions of some stars with their positions recorded nearly two centuries previously and realized that:
A) the celestial poles and equator remained stationery. B) the celestial poles and equator were slowly moving across the sky. C) the stars were moving closer to each other. D) the stars were moving across the sky randomly.