The area under a graph of ax vs. t from t = ti to t = tf represents
A. xf?xi.
B. vf?vi.
C. xav.
D. vav.
E. aav.
Answer: B
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A 0.150-m-radius grinding wheel, starting at rest, develops an angular speed of 12.0 rad/s in a time interval of 4.00 s. What is the centripetal acceleration of a point 0.100 m from the center when the wheel is moving at an angular speed of 12.0 rad/s?
a. 0.450 m/s2 b. 7.20 m/s2 c. 14.4 m/s2 d. 28.8 m/s2
An AC voltage source, with a peak output of 200 V, is connected to a 25-W resistor. What is the rate of energy dissipated due to heat in the resistor?
a. 566 W c. 800 W b. 400 W d. 200 W
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C A 1 kg block of ice is removed from a freezer where its temperature was –10°C. The amount of heat absorbed by the ice as it warms to 0°C is 20,000 J
Indicate whether the statement is true or false
Selective _________is the selective removal of one element from a metal alloy.
Fill in the blank(s) with the appropriate word(s).