A 20.0-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. If the block had been originally at rest and is free to move, what is its resulting speed?
a. 22.0 m/s
b. 18.0 m/s
c. 20.0 m/s
d. 2.00 m/s
e. 45.0 m/s
b
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The transit method allows us in principle to find planets around
A) only a small fraction of stars that have planets. B) all stars that have planets of any kind. C) only stars of about the same mass and size as our Sun. D) only stars located within about 100 light-years of Earth.
A mass src="https://sciemce.com/media/4/67174e56c9eba0e835.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
as shown in the figure. Both masses move vertically and there is no slippage between the string and the pulley. The pulley has a radius of 20.0 cm and a moment of inertia of 1?2 
If 
is 3.00 kg, 
is 6.00 kg and M is 4.00 kg, then what is the tension in the string that is attached to mass
A. 33.6 N
B. 42.8 N
C. 53.6 N
D. 63.4 N
E. 75.5 N
What is some of the evidence that Cygnus X-1 is a black hole?
What will be an ideal response?
A boy kicks a football with an initial velocity of 28.0 m/s at an angle of 30.0° above the horizontal. What is the highest elevation reached by the football in its trajectory?
A) 11.2 m B) 10.0 m C) 12.7 m D) 9.40 m E) 41 m