A 1000 kg sports car accelerates from zero to 25 m/s in 6.25 s. What is the average power delivered by the automobile engine?
a. 20.8 kW
c. 41.7 kW
b. 30.3 kW
d. 50.0 kW
D
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A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, 384,000 km away. What is the radius of the big red spot on the moon?
a. 500 m b. 250 m c. 120 m d. 1.0 km e. 2.7 km
What is the proper abbreviation for ‘kilohertz?'
a. kh b. khz c. Khz d. KHz e. kHz
Current understanding holds that a galaxy's type (spiral, elliptical, or irregular) ________
A) may either be a result of the mass of the protogalactic cloud that formed it or the result of the heavy element abundance in that cloud B) is always determined by the angular momentum of the protogalactic cloud that formed it C) is determined by whether the galaxy is located in a cluster where collisions are likely or outside a cluster where collisions are less likely D) may either be the result of conditions in the protogalactic cloud that formed it or the result of later interactions with other galaxies
Suppose you are out on a frozen lake, where there is no friction. Which of the following would start you moving towards the shore?
A. Removing a shoe and throwing it towards the shore B. Shouting at someone on the shore C. Removing a shoe and throwing it away from the shore D. None of these choices would work