Three long, straight, parallel wires all lie in the yz plane and each carries a current of 20 A in the positive z direction. The two outer wires are each 4.0 cm from the center wire. What is the magnitude of the magnetic force on a 50-cm length of either of the outer wires?
a. 1.0 mN
b. 0.50 mN
c. 1.1 mN
d. 1.5 mN
e. 2.0 mN
D
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A) absorb radiation relatively well. B) reflect radiation relatively well. C) both of these D) neither of these
Ordinary forces, such as pushes, pulls, normal forces and friction, are considered to be due to the
A) gravitational force. B) electromagnetic force. C) strong nuclear force. D) weak nuclear force. E) contact force.
Which of the following best describes the current status of the debate over evidence for life in the Martian meteorite ALH84001?
A) Most scientists now agree that the meteorite shows clear evidence of past life on Mars. B) Most scientists now agree that the meteorite shows no evidence for past life on Mars. C) Most scientists agree that the evidence would support life if the meteorite truly comes from Mars, but few scientists accept that the meteorite is from Mars and instead think it is an ordinary Earth rock. D) Most scientists find the evidence intriguing but suspect that it can be explained without requiring past life on Mars.
The initial speed of a cannon ball is 0.20 km/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km from the cannon, what is the minimum time of flight for the ball?
A. 16 s B. 21 s C. 24 s D. 14 s E. 19 s