In the context of a redshift and a blueshift, "red" and "blue" refer to the actual color of the light
Indicate whether the statement is true or false
False
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A box is pushed across a rough horizontal floor by a force acting parallel to the floor in the direction of motion. A force doing negative work on the body is
A. friction. B. gravity. C. the applied force. D. the normal reaction force of the floor upward on the body. E. a fictitious force.
When a bar magnet is thrust at the same speed into a coil having twice the number of loops, the induced voltage is
A) half. B) the same, no different. C) twice as much. D) four times as much. E) none of the above
A concave mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?
A) 50 cm B) 20 cm C) 15 cm D) 7.5 cm E) 5.0 cm
A 1000-kg car is driving toward the north along a straight road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest in a distance of 140 m. What is the constant force applied to the car to bring it to rest?
A) 1.43 N north B) 7.00 × 103 N south C) 1.43 × 103 N south D) 1.43 N south E) 143 N south