I need someone smart in science. Part 7.?

51.) An arrangement of pulleys designed to reduce the effort force is called a... A.) block and tackle B.) fixed pulley C.) inclined plane and a wedge D.) screw and an inclined plane

52.) Two simple machines that are part of a bicycle are a(n)... A.) gear and a wheel and axle B.) inclined plane and a lever C.) inclined plane and a wedge D.) screw and an inclined plane

53.) A material that reduces the flow of heat by conduction, conversation, and radiation is... A.) a conductor B.) condensation C.) an insulator D.) solar collector

54.) All of the following are good conductors of heat EXCEPT... A.) air B.) aluminum C.) copper D.) silver

55.) The transfer of energy that does NOT require matter is... A.) combustion B.) radiation C.) conduction D.) convection

56.) Energy from the Sun travels to Earth as... A.) chemical energy B.) combustion C.) radiant energy D.) mechanical energy

51. B
52. A
53. C
54. A
55. B
56. B/C - not 100 % sure :P

51) b

52) a

53) c

54) a

55) radiation (it can travel through a vacumn)

56) radiant energy

51. A

52. A

53. C

54. A

55. B

56. C

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