Co-generation has the advantage that ________
a. more energy is generated than is put into the system
b. the overall efficiency of the energy conversion process increases
c. more waste heat is generated
d. solar energy can be utilized to a greater extent
b
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A block (mass mA) lying on a fixed frictionless inclined plane is a mass ma by a cord passing over a pulley, as shown in Fig. 4-54.
(a) Determine a formula for the acceler ation of the system in terms of mA, mB, ?, and g,
(b) What conditions apply to masses mA and mp for the acceleration to be in one direction (say, ma down the plane), or in the opposite direction? Ignore the mass of the connected to cord and pulley.
A coconut and a bird's feather fall from a tree through the air to the ground below. The force of air resistance is
A) greater on the coconut. B) greater on the feather. C) the same on each.
An 80.0-g puck moving at 1.20 m/s on an air table collides with a stationary 100-g puck
After the collision, the 80.0-g puck moves in a direction that makes an angle of 45.0° with the original direction of motion and the 100-g puck moves at an angle of 12.0° in the opposite direction. What is the speed of the 80.0-g puck after the collision? A) 0.809 m/s B) 0.297 m/s C) 0.533 m/s D) 0.0953 m/s E) 1.23 m/s
A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
a. 0; 0. b. 0; 2.38 m/s, south. c. 0; 2.38 m/s, north. d. 1 000 m, south; 2.38 m/s, south. e. 1 000 m, north; 2.38 m/s, north.