A solid wood door, 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg. It is ajar and at rest. A ball with a mass of 500 g is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side
The ball rebounds with a speed of 16.0 m/s along the same line. How much energy is lost in the process? A) 29.8 J
B) 16.3 J
C) 14.9 J
D) 12.7 J
E) 4.79 J
A
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Kepler's Laws: If NASA wants to put a satellite in a circular orbit around the sun so it will make 2.0 orbits per year, at what distance (in astronomical units, AU) from the sun should that satellite orbit? The earth's orbit is 1.0 AU from the sun.
A. 7.6 AU B. 0.63 AU C. 0.50 AU D. 2.0 AU E. 0.71 AU
What does this photo show?
A) an interstellar cloud that will ultimately give birth to thousands of star systems B) an interstellar cloud that probably looks almost identical to the way the solar nebula looked about 4.5 billion years ago C) stars viewed through the atmosphere of Venus D) a galaxy much like our Milky Way Galaxy
What technique for measuring distance can you use to discover Hubble's Law?
A.) Cepheid variables in galaxies. B.) White dwarf supernovae in galaxies. C.) Redshifts of bright objects in galaxies. D.) A and B. E.) All of the above.
The clouds of Venus are much higher in its atmosphere than are those in our troposphere
Indicate whether the statement is true or false