The center of our galaxy is located in the direction of the constellation of Orion
a. True
b. False
Indicate whether the statement is true or false
False
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A convex mirror has a focal length of -20 cm. What is the object distance if the image distance is -10 cm?
a. 10 cm b. 40 cm c. 60 cm d. 20 cm e. 30 cm
A 200-kg box is placed on a ramp. As one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 18.0°. What is the coefficient of static friction between box and ramp?
a. 0.42 b. 0.32 c. 3.1 d. 0.27 e. 62
What physical process results in the convection of thermal energy?
a. Collisions between the particles in a material. b. The movement of a fluid through a space. c. The energy exchange when a liquid becomes a gas. d. The energy transferred by electromagnetic waves traveling between objects. e. Brownian motion.
A baseball pitcher, loosening up his arm before a game, tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 24 m/s in a time of 0.40 s, what is the average angular acceleration of the arm and ball?
a. 0.067 rad/s2 c. 15 rad/s2 b. 94 rad/s2 d. 190 rad/s2