A 4.00 kg object is moving at 3.00 m/s WEST. It strikes a 6.00 kg that is moving WEST at 2.00 m/s. The objects have a one-dimensional elastic collision in the EAST-WEST direction. The velocity of the 4.00 kg object after the collision is
A. 1.00 m/s WEST.
B. 2.80 m/s EAST.
C. 1.80 m/s WEST.
D. 2.80 m/s WEST.
E. 1.80 m/s EAST.
C. 1.80 m/s WEST.
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In which of the following cases can we determine the precise mass and density of an extrasolar planet?
A) We have detected the planet with both the transit and Doppler methods. B) We have detected the planet with the Doppler method, but not any other method. C) We have detected the planet with the transit method, but not any other method. D) We have observed both transits and eclipses of the orbiting planet.
A bar magnet passes through a circular loop of wire as shown below. At the instant that the middle of the magnet passes through the loop, the induced current ( as seen from the coil # 2) is
A. ccw and increasing.
B. cw and decreasing.
C. cw and increasing.
D. zero.
An atom with atomic number 3 is in its ground state. How many electrons are in its outermost shell?
What will be an ideal response?
The circuit below contains three resistors, A, B, and C, which all have equal resistances. The emf ? = 110V. Which resistor generates the most thermal energy after the switch is closed?
a.
A
b.
B
c.
C
d.
A and B
e.
All three generate equal amounts of thermal energy.