An automobile is moving on a highway at 100 km/hr. Estimate the heat loss per unit area from the auto’s roof, which is at 30ºC, if the air temperature is 15ºC.
What will be an ideal response?
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Food cooked in a microwave oven depends on electrical
A) conduction. B) charge polarization. C) resistance changes. D) field strength. E) all of the above
If M = 2.0 kg, what is the tension in string 1?
a.
1.2 N
b.
11 N
c.
34 N
d.
3.5 N
e.
40 N
For this situation, I push on a heavy chair.Suppose I push moderately on the chair, and this time the chair does move. Then the strength of the force the chair exerts on me is
a. less than the force I exert on the chair. b. equal to the force I exert on the chair. c. greater than the force I exert on the chair. d. zero.
What unit of measurement is used to describe extraordinary large distances, such as the distance of other stars from our own?
a. AU b. min c. ly d. km e. mi