A straight wire of length 70 cm carries a current of 50 A and makes an angle of 60° with a uniform magnetic field. If the force on the wire is 1.0 N what is the magnitude of 
?
A. 41 mT
B. 33 mT
C. 55 mT
D. 87 mT
E. 57 mT
Answer: B
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An electron moves with a speed of 8.0 × 106 m/s along the +x-axis
It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. (1 eV = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg) Calculate the magnitude of (a) the magnetic force on the electron. (b) the acceleration of the electron. What will be an ideal response?
First Law of Thermodynamics: A cyclic process is carried out on an ideal gas such that it returns to its initial state at the end of a cycle, as shown in the pV diagram in the figure. If the process is carried out in a clockwise sense around the enclosed area, as shown on the figure, then the magnitude of the enclosed area represents
A. the heat that flows out of the gas. B. the work done on the gas. C. the heat added to the gas. D. the work done by the gas.
Which of the following is the best explanation for the tremendous cliffs on Mercury?
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Based on the curves shown here, which of the following statements best describes how we can distinguish a massive star supernova from a white dwarf supernova?
A) A white dwarf supernova is brighter at its peak and over a few months fades more steadily than a massive star supernova. B) For a few seconds, a white dwarf supernova is brighter than a massive star supernova, but after that the two look virtually identical. C) The spectrum of a massive star supernova has two major spectral lines, while a white dwarf supernova has only one. D) The two types of supernovae behave so similarly that we can only distinguish them by studying photographs of the systems taken before the explosions.