The resistivity of a 1.0 m long wire is 1.72 × 10-8 ?m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?
A) 17 mV
B) 0.90 mV
C) 1.7 mV
D) 10 mV
E) 90 mV
C
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A particle with charge 2?C is placed at the origin. An identical particle, with the same charge, is placed 2 m from the origin on the x axis, and a third identical particle, with the same charge, is placed 2 m from the origin on the y axis. The magnitude of the force on the particle at the origin is:
A) 9.0 × 10-3 N B) 6.4 × 10-3 N C) 1.3 × 10-2 N D) 1.8 × 10-2 N E) 3.6 × 10-2 N
A standard candle is ________
A) a light source of known luminosity B) a 7-cm-long wax candle C) another name for a main-sequence star D) another name for a barred-spiral galaxy
Basic Postulates: You are riding in a spaceship that has no windows, radios, or other means for you to observe or measure what is outside. You wish to determine if the ship is stopped or moving at constant velocity. How can you do this?
A. You can determine if the ship is moving by determining the apparent velocity of light in the spaceship. B. You can determine if the ship is moving by checking your precision time piece. If it's running slow, the ship is moving. C. You can determine if the ship is moving by lying down and measuring your height. If you are shorter than usual, the ship is moving. D. You should give up because you have taken on an impossible task!
Why would anyone be interested in mining material from an asteroid?
What will be an ideal response?