Which of the following seems to be a region of self-sustaining star formation?
A) The Orion complex
B) The asteroid belt
C) The Kuiper Belt
D) The Solar System
A
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A 3.0-kg mass sliding on a frictionless surface has a velocity of 5.0 m/s east when it undergoes a one-dimensional inelastic collision with a 2.0-kg mass that has an initial velocity of 2.0 m/s west. After the collision the 3.0-kg mass has a velocity of 1.0 m/s east. How much kinetic energy does the two-mass system lose during the collision?
a. 22 J b. 24 J c. 26 J d. 20 J e. 28 J
A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into a room per cycle. How much work is required in each cycle?
A) 4 kJ B) 20 kJ C) 22 kJ D) 24 kJ E) 44 kJ
In 2008 the Phoenix spacecraft landed in the Martian arctic and found water ice
A) on the surface B) deep beneath the surface C) just below the surface D) was nowhere to be found
A thin ribbon of a silver alloy 2.00-cm wide and 0.0150-mm thick carries a current of 6.98 A perpendicular to a magnetic field. The Hall voltage is found to be 1.24 × 10?4 V when the magnetic field is 2.50 T. Calculate n, the number of charge carriers per cubic meter.
What will be an ideal response?