The ionosphere is an electrified ion-rich area
A) in the uppermost troposphere.
B) where atoms lose their electrons and are negatively charged.
C) where air density and solar radiation is low.
D) within the uppermost mesosphere and thermosphere.
Answer: D
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A year is defined as
A) the time it takes for Earth to complete a rotation on its axis. B) the time it takes for the Moon to complete an orbit of Earth. C) the time it takes for the Moon to complete a phase cycle. D) the time it takes for Earth to complete an orbit around the Sun. E) the time it takes for the Sun to complete an orbit around Earth.
As a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force exerted on it by water on it if it started above the surface of the water?
A) The buoyant force keeps increasing steadily. B) The buoyant force remains constant. C) The buoyant force first increases and then remains constant. D) The buoyant force steadily decreases.
A physics student is riding on a train traveling north. Having read about inertia, the student performs an experiment with a golf ball. He reaches over the aisle and drops the ball from rest. Instead of hitting the floor directly below the student's hand, it hits to the north, i.e., forward of that position. Which of the following might be the cause for this to happen?
a. The train is moving at constant velocity. c. The train is slowing down. b. The train is speeding up. d. Whatever the cause, it cannot be any of the answers given.
Calorimetry: A 44.0-g block of ice at -15.0°C is dropped into a calorimeter (of negligible heat capacity) containing 100 g of water at 5.0°C. When equilibrium is reached, how much of the ice will have melted? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg.
A. 2.1 g B. 21 g C. 5.2 g D. 52 g E. 4.4 g