If you place a plane mirror vertically into water, and a dolphin moves toward it with a speed of 4 m/s, she will see her image move toward her at a relative speed of
A) 6. m/s.
B) 10. m/s.
C) 2. m/s.
D) 4. m/s.
E) 8. m/s.
E
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What force is necessarily applied to the 2.5 cm-diameter piston of a hydraulic lift system in order to lift a truck of mass 1210 kg upon a platform supported by a 15 cm-diameter piston?
A. 33.6 N B. 1980 N C. 330 N D. 494 N E. 4850 N F. 202 N
A 12.0-kg mass is placed on a 29.0° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.660, and the coefficient of sliding friction is 0.546 . The mass is given a shove causing it to slide down the incline. What is the frictional force while the mass is sliding?
a. 57.0 N b. 102.9 N c. 56.2 N d. 67.9 N e. 10.5 N
Suppose there were no solar wind. How would the appearance of a comet in our inner solar system be different?
A) It would have only one tail instead of two. B) It would not have a coma. C) It would not have a nucleus. D) It would be much brighter in appearance.
The region of the electromagnetic spectrum with wavelengths just less than those in the ultraviolet region is the ______________ region
a. x-rays b. radio waves c. microwaves d. infrared e. gamma rays