Halley's Comet returns about every ______________ years

Fill in the blank(s) with correct word


76

Physics & Space Science

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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.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science