A hypernova is a violent event caused by _____
a. the merger of two neutron stars
b. the collapse of a rapidly rotating massive star
c. the fusion of a layer of degenerate helium deposited on the surface of a neutron star
d. carbon deflagration in a neutron star
e. the crossing of jets from two compact objects
b
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A wood block is placed on top of the ice in a large bowl half full of ice. The bowl is then filled to the brim with water, with the wood block riding on top of the ice. As the ice melts,
a. the density of the water decreases. b. the water level falls below the rim. c. the water level rises and water spills out of the bowl. d. the water level does not change. e. the wood block descends, causing water to spill out of the bowl.
The graph above shows 4 models for how the average distance between galaxies could change with time, from the past (left) to now (middle) to the future (right-hand side). The graph also shows real data, based on white dwarf supernovae. Which model(s) predict(s) that galaxies are getting farther apart NOW?
A) accelerating B) coasting C) critical D) recollapsing E) all of them
Light passes from medium one 
to medium two 
If v1< v2 then at the boundary
A. f increases 
decreases.
B. f does not change, 
increases.
C. f decreases, 
increases.
D. f does not change, 
decreases.
Three coplanar parallel straight wires carry equal currents I as shown below. The current in the outer wires is directed to the right, and that in the middle wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.