A 1.5m long, 0.75kg dowel is pivoted about the end so that it is a pendulum of sorts - it can freely swing in a vertical plane. At the other end of the dowel is a brass weight having mass 1.5kg. (The center of the brass weight is 1.5m from the pivot point. When the rod is positioned in its swing such that its angle with the vertical is 22.5 degrees, what is the net torque on the rod about the pivot?
A. 11 Nm
B. 28 Nm
C. 9.5 Nm
D. 25 Nm
C. 9.5 Nm
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Scientists always try to
A) be as subjective as possible B) be as objective as possible C) disagree with the current paradigm of the time D) agree with the current paradigm of the time
Rays that pass through a lens very close to the lens axis are more sharply focused than those that are very far from the axis. The inability of a lens to sharply focus off-axis rays is called spherical aberration
This effect helps us to understand why A) we become more farsighted as we grow older. B) we become more nearsighted as we grow older. C) we can see only in black and white in dim light. D) it is easier to read in bright light than in dim light. E) a moving object is more readily detected than a stationary one.
The mass of Pluto is 1.31 × 1022 kg and its radius is 1.15 × 106 m. What is the acceleration of a freely-falling object at the surface of Pluto if it has no atmosphere? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 9.81 m/s2 B) 1.62 m/s2 C) 3.72 m/s2 D) 0.661 m/s2 E) 0.140 m/s2
A 10.0 m2 area wall is constructed of three layers. The first layer is 2.00 cm thick and has a thermal conductivity 0.500 W/m?K
The second layer is 15.0 cm thick and has a thermal conductivity 0.100 W/m?K. The third layer is 3.00 cm thick and has a conductivity 1.00 W/m?K. How much heat flows through this wall per hour if one side of the wall is at 20.0°C and the other side is at 0.00°C? A) 3.22 × 105 J B) 1.73 × 105 J C) 4.59 × 105 J D) 1.14 × 105 J E) 2.68 × 105 J