34. The period of a satellite in LEO is: A. 24 hours B. 365 Days C. Cannot tell

Question

34. The period of a satellite in LEO is: A. 24 hours B. 365 Days C. Cannot tell since mass is not given D. 90 minutes E. 24 days 35. A refrigerator in a room with the door open will: A. Decrease the entropy of the room B. Decrease the average temperature of the room C. Increase the average temperature of the room D. Increase the pressure in the room E. Not change the average temperature of the room 36. Suppose you are trying to look into clear water that has a strong reflection of skylight on its surface. To reduce the reflection you can: A. Make the image pass through a diffraction grating B. Look through a polarizer with its conducting lines vertical. C. You cannot reduce the reflection by any means D. Look through a polarizer with its conducting lines horizontal E. Look through a small hole in a piece of cardboard. 37. If the input coil of a transformer has 60 turns of wire, carrying 1A at 120V and the output coil has 1 turn, what is the volatge and current that we expect to flow in the output coil? A. 2V, 60A B. 20V, 60A C. 20V, 6A D. 7.2kV, 0.6A E. 7.2kV, 6A 38. Hooke's law: A. Describes how entropy increases as a function of temperature change B. Relates the pressure to the velocity of a fluid C. Describes how distant objects effect the motion of local ones D. Relates how objects change size when forces are applied E. Describes how far objects move when there are random collisions 39. Two solid blocks collide on a smooth surface with no friction. If we know the mass and velocity of each block before collision. What do we know after collision? A. Relative velocity of the two blocks B. None of these C. Total momentum D. Total kinetic energy E. Velocity for each block

Explanation / Answer

34)

A low Earth orbit (LEO) is an orbit around Earth with an altitude of 2,000 km (1,200 mi) or less, and with an orbital period of between about 84 and 127 minutes.

So from among the given options, the one which lies between the said limit is the correct answer.

Ans: (D) 90 minutes.

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