A plane is moving due north, directly towards its destination. Its airspeed is 200 mph. A constant breeze is blowing from west to east at 40 mph. How long will it take for the plane to travel 200 miles north?
a. one hour
c. less than one hour
b. more than one hour
d. more information is needed
B
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A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper, with the aluminum and the copper in thermal contact. The specific heat capacity of aluminum is more than double that of copper
Which object experiences the greater magnitude gain or loss of heat during the time the system takes to reach thermal equilibrium? A) the aluminum B) the copper C) Neither one; both of them experience the same size gain or loss of heat. D) It is impossible to tell without knowing the masses. E) It is impossible to tell without knowing the volumes.
A filtergram is a photograph of the Sun's surface made
a. in a band of wavelengths in the infrared. b. in a band of wavelengths in the ultraviolet. c. using the Zeeman effect. d. with only those photons emitted in a specific spectral line. e. none of the others.
Intensity: An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter. What is the maximum value of the magnetic field in the laser beam? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 9.24 µT B. 17.2 µT C. 12.4 µT D. 20.5 µT E. 15.4 µT
The transit method searches for extrasolar planets by
A) monitoring stars for slight dimming that might occur as unseen planets pass in front of them. B) obtaining high-resolution photographs of other star systems. C) observing Doppler shifts in a star's spectrum caused by an unseen planet. D) looking for slight back and forth shifts in a star's position in our sky.