The free-body diagram below represents a 1500-kg car sitting on a 3000-kg bridge supported at its far ends. The car's position is three quarters of the length L from the left end of the bridge. Identify the one error in the torque equation below:
?
?
d
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Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?
A) 0.25 m/s2 B) 2.8 m/s2 C) 4.0 m/s2 D) 10 m/s2 E) 40 m/s2
At the first maxima on either side of the central bright spot in a double-slit experiment, light from each opening arrives
A) in phase. B) 90° out of phase. C) 180° out of phase. D) 45° out of phase. E) -45° out of phase.
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.
Which of the following is not a greenhouse gas?
A) oxygen (O2) B) carbon dioxide (CO2) C) methane (CH4) D) water vapor (H2O)