A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.If two slide projectors are connected in series across the same 120-volt source, the current drawn from the source is __________
Fill in the blank(s) with correct word
3 amperes
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The more powerful the motor is
a. the longer the time interval for doing the work is. b. the shorter the time interval for doing the work is. c. the greater the ability to do the work is. d. the shorter the workload is.
Which object has zero acceleration?
A) one at rest B) one moving at constant velocity C) one in mechanical equilibrium D) all of the above E) none of the above
Which of the following statements about circumpolar stars is true at all latitudes?
A) They are the stars close to the north celestial pole. B) They always remain above your horizon. C) They make relatively small circles, traveling clockwise around the north celestial pole. D) Like all other stars, they rise in the east and set in the west. E) You cannot see them from the Southern Hemisphere.
A cable is 100-m long and has a cross-sectional area of 1.0 mm2. A 1000-N force is applied to stretch the cable. Young's modulus for the cable is 1.0 × 1011 N/m2. How far does the cable stretch?
A) 0.10 m B) 1.0 m C) 10 m D) 0.010 m