The density of aluminum is 2700 kg/m3. If transverse waves propagate at 34 m/s in a 4.6-mm diameter aluminum wire, what is the tension on the wire?
A) 52 N
B) 31 N
C) 42 N
D) 62 N
A
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In principle, the Drake equation should enable us to calculate the exact number of intelligent civilizations capable of interstellar communication in our galaxy right now. However, currently this is not feasible because
A) we do not have exact numbers for any of the factors in the equation B) it is impossible for us to ever know the values of any of the factors C) we have exact numbers for the first three factors, but not the last factor D) we have an exact number for the first factor, but not for any of the other factors
Ice cream, when eaten, gives about 2100. Calories/kg to the body. On the other hand, the body must give back energy to warm it up to body temperature (37°C). Assuming ice cream has similar thermal properties to water:
(a) 1/2 kg produces how much energy? (b) 1/2 kg absorbs how much energy to reach 37°C? (c) What is the net gain or loss (eating 1/2 kg ice cream)?
Most of the detailed information about the planets in our solar system comes from
A) telescopic observations from Earth B) robotic spacecraft C) human visits D) meteorites
Which of the following materials has the highest dielectric constant?
a. air b. Mylar c. paper d. Pyrex glass e. water