A "grand-design" galaxy contains clear spiral arms with few spurs
a. True
b. False
Indicate whether the statement is true or false
True
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The capture of too few solar neutrinos by Davis in the solar neutrino experiment
a. has been disproved by the results of later experiments. b. can be explained if the sun is not undergoing thermonuclear fusion of hydrogen in its core. c. indicates that the sun's core is much hotter than expected. d. indicates that the sun's core is convective. e. none of the above
Mass on a Spring: A 0.30-kg block of wood is suspended on a spring. In equilibrium the wood stretches the spring 2.0 cm downward. The wood is then pulled an additional distance of 1.0 cm down and released from rest.(a) How long does it take the wood to make 3 complete cycles of vibration?(b) How much total mechanical energy does this system contain if we choose the total potential energy (elastic and gravitational) to be zero at the equilibrium position of the hanging block?
What will be an ideal response?
Multiple-Object Accelerating Systems: The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.53 s for it to reach the floor. What is the mass m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very light. 
A. 16 kg B. 14 kg C. 13 kg D. 11 kg
Describe some characteristics that all the planets seem to share and use the solar nebula theory to explain them
What will be an ideal response?