A proton moving at a speed of 4.2 × 10^6 m/s cuts across the lines of a magnetic field at an angle of 78°. The strength of the field is 0.91 × 10^?4 T. What is the magnitude of the force acting on the proton? (qp = 1.6 × 10^?19 C)
a. 1.3E–17 N
b. 3.1E–17 N
c. 6.0E–17 N
d. 7.2E–9 N
e. 9.6E–36 N
c
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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?
Photoelectric Effect: A metal surface has a work function of 2.50 eV. What is the longest wavelength of light that will eject electrons from the surface of this metal? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. The speed of the car just before the brakes were applied was
A) 1.2 m/s. B) 15 m/s. C) 30 m/s. D) 45 m/s. E) none of the above
For which of the following will the phenomenon of wave interference apply? (Choose the best answer.)
1.square-shaped pulses 2.sinusoidal pulses 3.triangular pulses 4.all of these