A 3.0-kg mass and a 5.0-kg mass hang vertically at the opposite ends of a rope that goes over an ideal pulley. If the masses are gently released from rest, how long does it take for the 3.0-kg mass to rise by 1.0 m?
A) 0.41 s
B) 0.74 s
C) 0.82 s
D) 1.8 s
E) 0.90 s
E
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Conduction: A heat conducting rod, 1.60 m long and wrapped in insulation, is made of an aluminum section that is 0.90 m long and a copper section that is 0.70 m long. Both sections have a cross-sectional area of 0.00040 m2. The aluminum end and the copper end are maintained at temperatures of 30°C and 170°C, respectively. The thermal conductivities of aluminum and copper are 205 W/m ? K (aluminum) and 385 W/m ? K (copper). At what rate is heat conducted in the rod under steady state conditions?
A. 9.0 W B. 7.9 W C. 10 W D. 11 W E. 12 W
According to the hypothesis of de Broglie, any moving particle has
a. energy. b. a magnetic force field. c. an electric force field. d. a wavelength.
When light travels from a larger index of refraction towards a smaller index of refraction, there is no phase change upon reflection at the boundary
Indicate whether the statement is true or false
Two long straight wires each carry a current of 12 A. One wire lies on the x-axis with its current in the positive x-direction. The other wire lies on the y-axis with its current in the positive y-direction. In the x-y plane, which quadrant (quadrants) has/have points where the magnetic field is zero?
A. I B. II C. II and IV D. I and III E. none