21.) A hollow steel ball of diameter 3m barely floats in water. What is the wall

Question

21.) A hollow steel ball of diameter 3m barely floats in water. What is the wall thickness of the ball? (qFe = 7.87 g/cm^3)

A) 37 cm                          B) 6.6 cm                              C) 79 cm                          D) 131 cm

22.) 20.00 cm of space is available. How long a piece of brass at 20 degrees Celsius can be put there and still fit at 200 degrees Celsius? Brass has a liner expansion coefficient of 19 x 10^-6 / C degrees.

A) 19.5 cm                       B) 19.93 cm                       C) 19.09 cm                       D) 19.69 cm

24.) You may have noticed that when you get out of swimming pool and stand dripping wet in a light breeze, you feel much colder than you feel after you dry off. Why is this?

A) The water on your skin is colder than the surrounding air.

B) 540 calories of heat are required to evaporate each gram of water from your skin, and most of this heat flows out of your body.

C) Water has a relatively large heat capacity

D) T he moisture on your skin has good thermal conductivity.

E) This is a purely psychological effect resulting from the way in which sensory nerves in the skin are stimulated

Explanation / Answer

1.B

density steel 7750 to 8050 kg/m

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