The hottest objects with temperatures in the millions of Kelvins, give off most of their radiation in which part of the electromagnetic spectrum?
A) visible
B) radio
C) ultraviolet
D) X-ray
E) gamma ray
D
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The uncharged particle inside an atom is
a. the electron. b. the proton. c. the neutron. d. the nucleus. e. none of the above.
An electron is traveling due south when it enters a uniform magnetic field directed due west. Which of the following statements concerning this situation is false?
a) The subsequent motion of the electron will be the same as if there were an electric field directed due west and no magnetic field present. b) The electron will follow a curved path. c) The direction of the magnetic force on the electron will vary with time. d) The magnitude of the magnetic force will be constant with time. e) The direction of the magnetic field and the direction of the magnetic force on the electron are perpendicular to one another.
An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage and current are present in the secondary?
What will be an ideal response?
A 4.0-kg block is pushed up a 36° incline by a force of magnitude P applied parallel to the incline. When P is 31 N, it is observed that the block moves up the incline with a constant speed. What value of P would be required to lower the block down the incline at a constant speed?
a. 27 N b. 15 N c. 13 N d. 17 N e. 19 N