The magnetic field of the Earth at a particular location is directed vertically downward with magnitude of 40.0 ?T. An electron is moving horizontally toward the west in this field with a speed of 5.2 × 10^6 m/s. What are the direction and magnitude of the magnetic force the field exerts on the electron? (e = 1.6 × 10^–19 C)
a. 3.33E–17,south
b. 3.33E–17,north
c. 2.08E–20,south
d. 2.08E–20,north
b
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A very elastic rubber ball is dropped from a certain height and hits the floor with a downward speed v. Since it is so elastic, the ball bounces back with the same speed v going upward
Which of the following statements about the bounce are correct? (There could be more than one correct choice.) A) The ball had the same momentum just before and just after the bounce. B) The magnitude of the ball's momentum was the same just before and just after the bounce. C) The ball's momentum was conserved during the bounce. D) None of the above statements are correct.
What should be the height of a dipole antenna (of dimensions 1/4 wavelength) if it is to transmit 1200 kHz radiowaves?
a. 11.4 m b. 60 cm c. 1.12 m d. 62.5 m e. 250 m
Write the energy balance for an ice pond at noon on a sunny day with solar energy of 300 W/m2 to the ice, air at -8ºC, convective heat transfer coefficient of 10 W/m^2?K above the ice, and 1ºC water with a convective heat transfer coefficient of 30 W/m^2?K below the ice. Then estimate the rate at which the ice thickness is increasing or decreasing.
What will be an ideal response?
Yellow paint always subtracts or absorbs
a. Red light b. Blue light c. Yellow light d. Cyan light