All classes of binary stars yield the basic information on stellar ________
Fill in the blank(s) with correct word
masses
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Life emerged from the oceans about _________ billion years ago
Fill in the blank(s) with correct word
A block holding a ringing tuning fork oscillates back and forth, attached to a wall by a spring of spring on a horizontal, frictionless surface, with amplitude 17 cm. The mass of the tuning fork and block together is 0.75 kg. An observer who is situated so that the block’s direction of motion is either directly towards or away from him notes that the frequency he hears varies between 174 and 178 Hz. What is the period of motion of the block? The speed of sound at the time of the experiment is 340 m/s.
A. Cannot do without knowing the spring constant. B. 0.28 s C. 0.14 s D. 0.044 s E. 0.022 s
Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal you should
A) use light of a longer wavelength. B) use light of a shorter wavelength. C) use light of the same wavelength but increase its intensity. D) use light of the same wavelength but decrease its intensity.
An 80,000-kg airliner is flying at 900 km/h at a height of 8.00 km. What is its total energy (kinetic + potential) if the total was 0 when the airliner was at rest on the ground?
a. 250 MJ c. 8770 MJ b. 478 MJ d. 10,300 MJ