You stand three feet away from a plane mirror. How far is it from you to your image?
a. 4.0 ft
c. 2.0 ft
b. 6.0 ft
d. 3.0 ft
B
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In our Sun, the spectral lines of hydrogen are weak, compared to their appearance in hotter stars
Indicate whether the statement is true or false
A car of mass m goes around a banked curve of radius r with speed v
If the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to A) mg/2. B) mg. C) mg sin? . D) mv2/r. E) tan[v2/(rg)].
Starting with a heat balance, show that the effectiveness for a counterflow arrangement is
GIVEN
Counterflow heat exchanger
FIND
Show that the effectiveness is
ASSUMPTIONS
Heat loss to surroundings in negligible
SKETCH
Hydrostatic equilibrium refers to the balance between weight and pressure
Indicate whether the statement is true or false