If I short out a D cell and draw a current of 7 A for 5 s, how many coulombs of charge move through the circuit?
a. 7 C b. 5 C
c. 7/5 C d. 35 C
d
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A cooling tower, shown schematically, has outside surface temperature of 70ºC when quiescent air is 10ºC. If the nominal diameter of the tower is 20 m, estimate a) the vertical distance up from the base where turbulent flow begins and b) total heat transfer due to natural convection.
What will be an ideal response?
The radio radiation emitted by a radio lobe is mainly synchrotron radiation
a. True b. False Indicate whether the statement is true or false
A satellite is placed in a geosynchronous orbit. In this equatorial orbit with a period of 24 hours, the satellite hovers over one point on the equator. Which statement is true for a satellite in such an orbit?
a. There is no gravitational force on the satellite. b. There is no acceleration toward the center of the Earth. c. The satellite is in a state of free fall toward the Earth. d. There is a tangential force that helps the satellite keep up with the rotation of the Earth. e. The force toward the center of the Earth is balanced by a force away from the center of the Earth.
Astronomers can detect the spin rates of stars by
A) their temperature. B) changes in temperature. C) absorption spectra. D) the Doppler effect. E) all of the above