A sound source of frequency 1 100 Hz moves at 40.0 m/s toward a listener who is at rest. What is the apparent frequency heard by the listener? (speed of sound = 340 m/s)
a. 1 230 Hz
b. 970 Hz
c. 980 Hz
d. 1 250 Hz
e. 870 Hz
d
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The boundary shown is that of a uniform magnetic field directed in the positive z direction. An electron enters the magnetic field with a velocity pointing along the x axis and exits 0.63 ?s later at point A. What is the magnitude of the magnetic field?
A. 18 ?T B. 14 ?T C. 28 ?T D. 34 ?T E. 227 ?T
Which of the following is not caused by the Coriolis effect on Earth?
A) Water going down a drain swirls in opposite directions in the Northern and Southern hemispheres. B) Earth's global circulation cells are split into three separate cells in each hemisphere. C) Hurricanes swirl in opposite directions in the Northern and Southern hemispheres. D) Air or objects moving northward in the Northern Hemisphere are deflected to the east.
What happened to the quarks that existed freely during the particle era?
A) They combined in groups to make protons, neutrons, and their antiparticles. B) They froze out of the soup of particles at the end of the era. C) They evaporated. D) They combined in groups to make electrons and neutrinos. E) They combined in groups to make W and Z bosons.
The Venus lacks
a. an atmosphere. b. a solid surface. c. a moon. d. a gravitational field.