The force of gravity is an inverse square law. This means that, if you double the distance between two large masses, the gravitational force between them _________________.
Fill in the blank(s) with the appropriate word(s).
weakens by a factor of 4
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Mass on a Spring: An object of mass m = 8.0 kg is attached to an ideal spring and allowed to hang in the earth's gravitational field. The spring stretches 2.2 cm before it reaches its equilibrium position. If it were now allowed to oscillate by this spring, what would be its frequency?
A. 3.4 Hz B. 0.28 × 10-3 Hz C. 0.52 Hz D. 1.6 Hz
Which of the following methods describes the transit method for detecting extrasolar planets?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky B) detection of Doppler shifts in the spectra of the parent stars C) detection of brightness changes in a star as a planet passes in front of it D) detection of reflected starlight
Northern hemisphere winters are colder than northern hemisphere summers because
a. Earth is closer to the Sun during the summer than it is during the winter. b. the snow that falls in the northern latitudes cools Earth during the winter. c. the light from the Sun shines more directly on the northern hemisphere during the summer. d. the period of sunlight is longer during the summer than during the winter. e. the light from the Sun shines more directly on the northern hemisphere during the summer and the period of sunlight is longer during the summer than during the winter.
Which of the items below is electromagnetic radiation?
a. gamma rays
b. X-rays
c. visible light
d. radio
e. All of the other choices are correct.