A proton is located at the point (x = 1.0 nm, y = 0.0 nm) and an electron is located at the point Find the magnitude of the electrostatic force that each one exerts on the other. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)
A) 1.4 × 10-11 N
B) 5.3 × 10-18 N
C) 5.3 × 108 N
D) 5.9 × 10-15 N
A
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A titanium bar (E 5 100 GPa, v 5 0.33) with square cross sec-tion (b 5 75 mm) and length L 5 3.0 m is subjected to tensile load P 5 900 kN. The increase in volume of the bar is approximately:
(A) 1400 mm3
(B) 3500 mm3
(C) 4800 mm3
(D) 9200 mm3
Two identical cars are traveling around the same curve on a highway. One of them is moving at 60 mph, and the other is moving at 30 mph. The centripetal force acting on the car moving at 60 mph is __________ the value of the centripetal force acting on the car moving at 30 mph
a. one quarter b. one half c. the same as d. twice e. four times
Three wires are made of copper having circular cross sections. Wire 1 has a length L and radius r. Wire 2 has a length L and radius 2r. Wire 3 has a length 2L and radius 3r. Which wire has the smallest resistance?
1.wire 1 2.wire 2 3.wire 3 4.All have the same resistance. 5.Not enough information is given to answer the question.
A hunter on level ground fires a bullet at an angle of 10 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
A) the one dropped B) the one fired C) both hit at the same time.