During the eighteenth and nineteenth centuries, attempts to precisely measure the astronomical unit relied largely on rare:
A) total solar eclipses.
B) transits of the inferior planets across the Sun.
C) passages of comets close to the Earth.
D) maximum elongations of Venus.
E) oppositions of Mars.
B
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The SI unit H (the henry) is equal to a
A. V/m. B. V/A. C. V·s. D. V·s/A. E. V·A/s.
Weight and g: At a given point above Earth's surface, the acceleration due to gravity is equal to 7.8 m/s2. What is the altitude of this point above Earth's surface? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A. 770 km B. 970 km C. 1500 km D. 2000 km E. 2400 km
A force on a particle depends on position such that F(x) = (3.00 N/ ) + (6.00 N/m)x for a particle constrained to move along the x-axis. What work is done by this force on a particle that moves from x = 0.00 m to x = 2.00 m?
A) 10.0 J B) 20.0 J C) -48.0 J D) 24.0 J E) 48.0 J
The short pulses and the discovery of the pulsar in the Crab Nebula are strong evidence that pulsars are _____
A) red dwarfs B) neutron stars C) giant stars D) yellow dwarfs