Ethanol is to be boiled in a tube. If the tube temperature is expected to be 450 K, and ethanol boils at 351.5 K, what is the superheat?
What will be an ideal response?
The superheat or degrees of superheat is the difference between the heating
surface temperature and the saturation temperature. Thus,
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What type of spectrum is observed when the light from a hot, dense body is seen through a cooler, tenuous gas?
A. emission-line B. continuous C. absorption-line D. None of these choices are correct.
How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature?
What will be an ideal response?
An object of mass m is suspended by two coplanar wires, as shown below. The tension in each wire has a magnitude given by
A.
.B.
.C.
.D.
E.
.A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
a. 3.2 mN b. 2.1 mN c. 5.3 mN d. 4.2 mN e. 6.0 mN