How does a lenticular galaxy differ from a spiral galaxy?
A) It has no bulge.
B) It has an elongated bulge resembling a bar more than a sphere.
C) It is flatter in shape.
D) It has no gas or dust.
E) It has no spiral arms.
E) It has no spiral arms.
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When viewed from above, suppose that a helicopter’s rotor spins clockwise. The helicopter engine must continually exert a torque on the rotor to keep it spinning against the drag that the air exerts on the rotor. Note that a helicopter is usually designed so its center of mass is directly under the rotor. In order for the helicopter to hover motionless in the air, a small rotor at the helicopter’s tail is necessary. As viewed by someone looking at the tail from the helicopter’s front, the small rotor must blow air
A. To the left. B. To the right. C. Vertically upward. D. Vertically downward. E. In some combination of these directions.
Unlike Earth, Mars' seasons are affected (enhanced and diminished) by the distance between Mars and the Sun. This is because:
A) Earth is closer to the Sun to begin with. B) an Earth year is shorter. C) Mars is tilted more on its axis than Earth is. D) the orbit of Mars is significantly more elliptical. E) Mars gets closer to the Sun than the Earth does.
A block is on a frictionless table, on earth. The block accelerates at 5.3 m/ when a horizontal force is applied to it. The block and table are set up on the Moon where the acceleration due to gravity is 1.62 m/
A horizontal force of 5 N is now applied to the block when it is on the Moon. The acceleration imparted to the block by this force is closest to A) 2.7 m/ . B) 2.4 m/ . C) 2.9 m/ . D) 3.2 m/ . E) 3.4 m/ .
The Moon always presents the same face to Earth because
a. the Moon does not rotate on its axis. b. the Moon rotates on its axis at same rate at which it revolves around Earth. c. the Moon revolves around the Sun in one month. d. none of these