Astronomer's believe that a spiral galaxy may form:
A) from a collision between a small and large galaxy.
B) due to a quasar shutting down.
C) from the sudden contraction of an elliptical galaxy.
D) from the collision of two giant elliptical galaxies.
E) from the explosion of a dwarf irregular galaxy.
A
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Why do vapor bubbles get larger in boiling water as they approach the surface?
a. They only appear to get larger, this being a magnification effect due to looking through the water. b. The bubbles' pressure increases as they rise. c. The pressure in the water decreases as the bubble moves toward the surface. d. Bubbles always get bigger after they form.
A parallel plate of area 400 cm2 is dragged over a 0.20 cm thick layer of oil at a speed of 30.0 cm/s. It takes a force 1.20 N applied to the plate to sustain this speed. What is the viscosity of the oil?
A) 6.00 kg/(m?s) B) 20.0 kg/(m?s) C) 60.0 kg/(m?s) D) 0.200 kg/(m?s) E) 200 kg/(m?s)
Substance A has twice the heat capacity of substance B. If equal masses of both substances are raised 10 °C and substance A gains 30 kJ of energy, substance B gains 15 kJ of energy
What will be an ideal response?
A closed, sealed can of air placed on a hot stove. The contained air undergoes an increase in
A) mass. B) temperature. C) both of these D) neither of these