The amount of light received at Earth from a star is called luminosity
a. True
b. False
Indicate whether the statement is true or false
False
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An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field. b. Sonya, because the electron moves opposite to the direction of the field. c. Joanna, because the electron moves in the direction of the field. d. Sonya, because the electron moves in the direction of the field. e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.
Explain why it so much more expensive to transmit electricity locally than over long distances. Give as many reasons for this as you can
What will be an ideal response?
The Sun's magnetic field is evident in the looped shapes of
a. solar flares. b. sunspots. c. the corona. d. granules. e. prominences.
A 1.500 m long uniform beam of mass 30.00 kg is supported by a wire as shown in the figure. The beam makes an angle of 10.00 degrees with the horizontal and the wire makes and angle of 30.00 degrees with the beam. A 50.00 kg mass, m, is attached to the end of the beam. What is the tension in the wire?
A. 2,034 N
B. 1,855 N
C. 1,435 N
D. 1,255 N
E. 1,035 N