Halley's Comet returns about every ______________ years
Fill in the blank(s) with correct word
76
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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.
Which of the following observations would not be likely to provide information about the final, explosive stages of a star's life?
A) studying the light rings around Supernova 1987A in the Large Magellanic Cloud B) decades of continuous monitoring of red giants in a globular cluster C) observing the structures of planetary nebulae D) neutrino detections from nearby supernovae
How much heat (in kcal) must be removed to make ice at -10°C from 2 kg of water at 20°C? (The specific heat of ice is 0.50 cal/g×°C.)
a. 190 b. 200 c. 240 d. 210 e. 50
Two isotopes of uranium have the same
a. mass number b. neutron number c. atomic number d. nucleon number e. nucleon number and neutron number