The Sun's surface seethes and churns with a bubbling pattern. Why?
A) We are seeing hot gas rising and cool gas falling as a result of the convection that occurs beneath the surface.
B) The Sun's surface is boiling.
C) The churning gas is being stirred up by the strong solar wind.
D) The churning is an illusion created by varying radiation; the gas on the Sun's surface is actually quite still.
A) We are seeing hot gas rising and cool gas falling as a result of the convection that occurs beneath the surface.
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Uniform Circular Motion: A 20-g bead is attached to a light 120-cm-long string as shown in the figure. This bead moves in a horizontal circle with a constant speed of 1.5 m/s. What is the tension in the string if the angle ? is measured to be 25°?
A. 0.089 N B. 0.041 N C. 0.20 N D. 0.22 N E. 0.46 N
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. What is the maximum speed of the needle?
A) 3.18 cm/s B) 4.51 cm/s C) 20.3 cm/s D) 10.1 cm/s E) 6.36 cm/s
The biological damage caused by radioactive materials is due to
A) nuclear fusion occurring within biological cells. B) thermal energy created by radioactive decay within biological cells. C) nuclear fission occurring within biological cells. D) the fast-moving daughter nuclei [or residual nuclei] passing through biological cells. E) the fast-moving alpha, beta, and gamma particles passing through biological cells.
The number of photons per second passing a plane perpendicular to a collimated monochromatic (one frequency) beam of light transporting power P is directly proportional to
a. the wavelength of the light. b. the frequency of the light. c. the power of the beam. d. all of the above. e. only (a) and (c) above.