A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = -2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire?
a. 3.2 ILB
b. 5.0 ILB
c. 4.2 ILB
d. 3.6 ILB
e. 1.0 ILB
D
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The ancient Greeks get a lot of attention for their contributions to science because ________
A) they were the only ancient culture that kept written records of their astronomical observations B) they were the first people to realize that Earth is a planet orbiting the Sun C) they were the first people known to try to explain nature with models based on reason and mathematics, without resort to the supernatural D) the books of every other culture were lost in the destruction of the library of Alexandria
A supersonic plane passes overhead at a speed of 500 m/s. If you hear the sonic boom (shock wave) 4.00 s after the plane is directly overhead, at what altitude is the altitude the plane flying? Assume the speed of sound in air is 340 m/s
A) 1.36 km B) 2.16 km C) 1.85 km D) 2.45 km E) The plane is not flying fast enough to produce a shock wave.
How fast is a galaxy at a distance of 3000 Mpc receding from us?
A: 216,000 km/s B: 3000 km/s C: 2400 km/s D: 24 km/s E: 24,000 km/s
Which of the following is true according to the hypothesis on chemical evolution?
A) Early living things reproduced by linking and breaking apart at random. B) Reproducing molecules did not originate on Earth but instead arrived from space. C) Somewhere in the oceans, after sufficient time, a molecule formed that could copy itself. D) Due to the effect of ultraviolet radiation, complex organic molecules that were living were formed.