The figure represents the position of a particle as it travels along the x-axis. Between t = 2 s and t = 4 s, what is (a) the average speed of the particle and (b) the average velocity of the particle?
What will be an ideal response?
Answer: (a) 1.0 m/s (b) 0.00 m/s
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At what frequency will a 12-?F capacitor have a reactance XC = 300??
a. 44 Hz b. 88 Hz c. 180 Hz d. 350 Hz e. 280 Hz
Specific Heat: In grinding a steel knife, the metal can get as hot as 400°C. If the blade has a mass of 80 g, what is the minimum amount of water needed at 20°C if the water is to remain liquid and not rise above 100°C when the hot blade is quenched in it? The specific heat of the steel is 0.11 cal/g ? C° and the specific heat of water is 1.0 cal/g ? C°.
A. 22 g B. 33 g C. 44 g D. 55 g
If the momentum of an electron is 1.95 × 10-27 kg ? m/s,
what is its de Broglie wavelength? (h = 6.626 × 10-34 J ? s) A) 340 nm B) 210 nm C) 170 nm D) 420 nm E) 520 nm
If we learn that the universe is a recollapsing universe, it will mean that the universe is presently contracting, rather than expanding as generally believed
Indicate whether the statement is true or false