Which of the following describes an object that is accelerated?
A) A car slowing down while moving along a straight line
B) A car rounding a curve at a steady 80 km/hr
C) Both of the above.
D) A car moving up a straight hill [a hill whose "slope" is unchanging] at a steady 80 km/hr, when the car is midway up the hill
E) All of the above.
C
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You hold a tennis racket in your hand. On top of the racket you have balanced a ball. Which statement is true?
a. The force of your hand on the racket and the force of the ball on the racket are equal and opposite. b. The force of the racket on your hand and the force of the ball on the racket are equal and opposite. c. The force of your hand on the racket and the force of the racket on the ball are equal and opposite. d. The force of the racket on your hand and the force of the racket on the ball are equal and opposite. e. The force of your hand on the racket and the force of the racket on your hand are equal and opposite.
A +15-nC point charge is placed on the x axis at x = 1.5 m, and a -20-nC charge is placed on the y axis at y = -2.0m. What is the magnitude of the electric field at the origin?
a. 105 N/C b. 15 N/C c. 75 N/C d. 45 N/C e. 60 N/C
The type of EM waves used in radar is
a. ultraviolet b. infrared c. x ray d. microwave e. blackbody
Most Greek philosophers believed in a(n) _______________ Universe
Fill in the blank(s) with correct word