The noble metals are good electrical and _________conductors.
Fill in the blank(s) with the appropriate word(s).
thermal
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Quasars must be small because they
a. have high radial velocities. b. are very luminous. c. are surrounded by quasar fuzz. d. radiate huge amounts of energy. e. fluctuate rapidly on time scales as short as a few hours.
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.
A lawn mower has a 6-horsepower engine (1 HP = 750 W). If the engine has an efficiency of 20%, and the throttle is such that the engine cycles 10 times a second, the heat that is expelled in one cycle is
a. 1 800 J b. 2 000 J c. 2 200 J d. 2 400 J e. 2 250 J
An ideal gas occupies 400 L at an absolute pressure of 500 kPa. Find the absolute pressure if the volume changes to 950 L and the temperature remains constant
A) 500 kPa B) 210 kPa C) 760 kPa D) 950 kPa E) 1150 kPa