_________is an alloy of zinc and copper
Fill in the blank(s) with the appropriate word(s).
Brass
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If an R = 1.0-k? resistor, a C = 1.0-?F capacitor, and an L = 0.20-H inductor are connected in series with a V = 150 sin (377t) volts source, what is the maximum current delivered by the source?
A. 0.007 0 A B. 27 mA C. 54 mA D. 0.31 A E. 0.34 A
Equilibrium: A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
A. 231 N B. 400 N C. 800 N D. 2560 N E. 3920 N
A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 ×10-26 kg,
and each one strikes the umbrella (without rebounding) with a speed of 2.0 m/s in the same direction, how many molecules strike the umbrella each second? Assume that the wind blows horizontally so that the gravitational force exerted on the air molecules can be neglected.
The average mass per nucleon is greatest in which of the following elements?
a. hydrogen b. iron c. uranium d. krypton