An object moving on the x axis with a constant acceleration increases its x coordinate by 80 m in a time of 5.0 s and has a velocity of +20 m/s at the end of this time. Determine the acceleration of the object during this motion
a. -1.6 m/s2
b. +6.4 m/s2
c. +1.6 m/s2
d. -2.0 m/s2
e. -6.4 m/s2
C
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The following equation has been proposed for the heat transfer coefficient in natural convection from long vertical cylinders to air at atmospheric pressure:
Where Tf = the film temperature = 1/2 (Ts + T?) and Tf is in the range 0 to 200°C The corresponding equation in dimensionless form is
Compare the two equations, to determine those values of C, m and n in the second
equation that will give the same results as the first equation.
GIVEN
Empirical equations shown above
FIND
Values of C, m and n
ASSUMPTIONS
Air behaves as an ideal gas
An observer approaches a stationary 1000 Hz sound source at twice the speed of sound. The observer hears a frequency of
A) 2000 Hz. B) 500 Hz. C) 4000 Hz. D) 1500 Hz. E) 3000 Hz.
The kilowatt-hour is a unit of
a. power c. voltage b. energy d. current
Galileo's telescopic discoveries of mountains on the moon and spots on the sun were controversial because they suggested that the sun and moon
a. were the same kind of object. b. were not perfect spheres. c. were inhabited. d. orbited each other. e. did not orbit Earth.