Consider an RLC circuit. The impedance of the circuit increases if XL increases
A) always true
B) never true
C) true only if XL is greater than or equal to XC
D) true only if XL is less than or equal to XC
C
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Pressure in a Liquid: The Aswan High Dam on the Nile River in Egypt is 111 m high. What is the gauge pressure in the water at the foot of the dam? The density of water is 1000 kg/m3.
A. 1.09 × 106 Pa B. 1.16 × 106 Pa C. 1.09 × 103 Pa D. 1.11 × 105 Pa E. 1.11 × 102 Pa
For uniformly accelerated motion, which of the following quantities must be zero?
a. the initial acceleration b. the initial velocity c. the initial displacement d. the time rate of change of the acceleration e. the time rate of change of the velocity f. the time rate of change of the displacement
If I fire a cannonball from the top of a mountain, traveling parallel to the Earth's surface at 14,000 miles per hour (6.26km/s), it travels a great distance before falling to Earth. If instead, I fire it at 16,000 miles per hour (7.15km/s) it:
A) travels completely around the Earth before returning to the mountaintop B) drops to Earth immediately C) travels the whole way to the Moon, orbits it once, then comes back D) travels a much smaller distance before falling to Earth E) travels exactly the same distance before falling to Earth
How do the atmospheres of the Moon and Mercury compare?
A) Mercury's is much denser, like Venus, with much carbon dioxide. B) They are about equal, each only 1% as dense as ours. C) The cooler Moon retains a thicker nitrogen atmosphere. D) As no spacecraft has yet landed there, no information exists about Mercury's. E) Neither body has a permanent true atmosphere.