A watt is equal to 746 horsepower
a. True
b. False
Indicate whether the statement is true or false
False
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In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.5 km?
A) 79 m/s B) 310 m/s C) 260 m/s D) 160 m/s E) 510 m/s
An electron moving in the +y direction, at right angles to a magnetic field, experiences a magnetic force in the -x direction. The direction of the magnetic field is in the
A) -x direction. B) +x direction. C) +y direction. D) -z direction. E) +z direction.
Consider fully developed laminar flow of a fluid inside a wide rectangular duct with both the upper and lower surface at uniform surface temperature, as schematically shown in the figure below. The effect of the two sides of the duct is neglected (W>> H), and at a location far from the entrance the velocity distribution is assumed to be uniform, u(x) = Cu whereas the temperature distribution has a parabolic profile given by T(x)= Ts + CT (1 –(2x/H)2). From the given velocity and temperature distributions, calculate the Nusselt number, which is given by its definition as where Tb is the average bulk temperature of the flowing fluid at the specified location, and k is the thermal conductivity of the fluid.
GIVEN
Fully developed laminar flow of fluid inside rectangular duct
Uniform upper and lower surface temperature
Uniform velocity distribution u(x) = Cu
Parabolic temperature distribution T(x)= Ts + CT (1 –(2x/H)2
FIND
Nusselt number
SKETCH
Earth exerts a gravitational force of 7000 N on one of the communications satellites. What force does the satellite exert on Earth?
A. more than 7000 N B. 7000 N C. less than 7000 N D. zero