Where do most dust grains form?
A) in supernovae
B) in the winds of red giant stars
C) in planetary nebulae
D) in molecular clouds
B) in the winds of red giant stars
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For which value of ? is the range of a projectile fired from ground level a maximum?
A) 30° above the horizontal B) 45° above the horizontal C) 55° above the horizontal D) 60° above the horizontal E) 90° above the horizontal
Mass and Weight: The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?
A. Mass is less, weight is the same. B. Mass is the same, weight is less. C. Both mass and weight are less. D. Both mass and weight are the same.
A supertanker filled with oil has a total mass of 6.1 × 10^8 kg. If the dimensions of the ship are those of a rectangular box 300 meters long, 80 meters wide, and 40 meters high, determine how far the bottom of the ship is below sea level. (?sea = 1 020 kg/m3.)
a. 10 m b. 15 m c. 20 m d. 25 m e. 30 m
An ac generator consists of a coil with 40 turns of wire, each with an area of 0.06 m2
The coil rotates in a uniform magnetic field B = 0.4 T at a constant frequency of 55Hz. What is the maximum induced emf? A) 110 V B) 625 V C) 200 V D) 421 V E) 332 V