I attach a 4.0-kg block to a spring that obeys Hooke's law and supply 3.4 J of energy to stretch the spring. I release the block; it oscillates with period 0.15 s. The amplitude is
a. 2.2 cm.
b. 3.1 cm.
c. 1.6 cm.
d. 20 cm.
e. 4.4 cm.
b
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Why do stars have dark lines in their spectra?
A. They simply don't emit light at certain wavelengths. B. The cooler atoms in their surface layers absorb the radiation at some wavelengths. C. Magnetic fields in Earth's atmosphere absorb the radiation at some wavelengths. D. The statement is false. Stars have bright emission lines in their spectra, but no absorption lines.
Consider the four U.S. non-renewable energy resources: gas, oil, coal, uranium without recycling for plutonium recovery. Assuming that we used each of these for a major portion of our energy needs, for which ones would domestic U.S
resources run out within some 50 years, and which ones does the United States have in much greater abundance? A) The United States is running out of gas and oil, but has abundant coal and uranium. B) The United States is running out of all four. C) The United States is running out of gas, oil, and uranium, but has abundant coal. D) The United States has abundant supplies of all four of these resources. E) The United States is running out of gas, oil, and coal, but has abundant uranium.
A child is riding a merry-go-round that has an instantaneous angular speed of 1.25 rad/s and an angular acceleration of 0.745 rad/s2. The child is standing 4.65 m from the center of the merry-go-round
What is the magnitude of the linear acceleration of the child? A) 8.05 m/s2 B) 7.27 m/s2 C) 2.58 m/s2 D) 3.46 m/s2 E) 4.10 m/s2
Mutual inductance can depend upon
A) the shape of the coils. B) the number of coils. C) the number of turns. D) the relative position of the coils. E) all of the above as well as other factors.