Stars form from a collapsing cloud that fragments into smaller and smaller pieces. This process takes about:
A) 10,000 years.
B) 25,000 years.
C) 100,000 years.
D) a few million years.
E) 100 million years.
D
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Meters: A galvanometer with a coil resistance of 40.0 ? deflects full scale for a current of 2.0 mA. What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for 50 V?
A. 25 k? B. 27 k? C. 29 k? D. 31 k?
From a latitude of 60 degrees north during the winter, the Sun will
A) spend most of each day below the horizon. B) spend most of each day above the horizon. C) never be seen above the horizon. D) end a few weeks continuously below the horizon.
A 1200-kg pick-up truck traveling south at 15 m/s suddenly collides with a 750-kg car that is traveling east. The two vehicles stick together and slide along the road after colliding
A highway patrol officer investigating the accident determines that the final position of the wreckage after the collision is 25 m, at an angle of 50° south of east, from the point of impact. She also determines that the coefficient of kinetic friction between the tires and the road at that location was 0.40. What was the speed of the car just before the collision? A) 20 m/s B) 4.8 m/s C) 14 m/s D) 23 m/s E) 17 m/s
Body A has a higher temperature than body B. Which of the following statements is true?
1.Body A will feel hotter than body B. 2.Body A contains more energy than body B. 3.If placed in contact with each other, energy will flow from body A to body B. 4.If placed in contact with a third body having temperature greater than body A, body B will absorb more heat than A. 5.More than one statement is true.