The Paleozoic era ended with an event called the
a. Chicxulub Impact.
b. Cambrian Explosion.
c. Great Dying.
d. Pangaean Rift.
c
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An automobile engine takes in 4000 J of heat and performs 1100 J of mechanical work in each cycle. (a) Calculate the engine's efficiency. (b) How much heat is "wasted" in each cycle?
What will be an ideal response?
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s north, and the total acceleration of the car is 2.5 m/s2 37° south of west. Which of the following is correct?
a. R = 0.40 km, and the car's speed is decreasing. b. R = 0.20 km, and the car's speed is decreasing. c. R = 0.20 km, and the car's speed is increasing. d. R = 0.16 km, and the car's speed is increasing. e. R = 0.16 km, and the car's speed is decreasing.
Determine the magnitude and sense (direction) of the current in the 500-? resistor when I = 30 mA.
A. 56 mA left to right B. 56 mA right to left C. 48 mA left to right D. 48 mA right to left E. 26 mA left to right
Which of the following best describes the modern definition of a constellation?
A) a region of the celestial sphere B) a pattern of bright stars in the sky C) a Greek mythological figure D) a collection of stars that are near one another in space E) a group of stars that all lie at about the same distance from Earth