If a sound level increases by 30 dB, the intensity increases by a factor of ______________
Fill in the blank(s) with correct word
1000
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A charge +3q is placed at x = 0 and a charge +11q is placed at x = 5 units. Where, along the x-axis is the net force on a charge Q equal to zero?
A) x = 1.72 units B) x = 0.48 units C) x = 0.27 units D) x = 0.21 units E) x = 0.52 units
The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. The mass of a nickel atom is 9.75 × 10-26 kg
What is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 J ? s, h = 1.055 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 0.015 eV B) 0.019 eV C) 0.023 eV D) 0.027 eV E) 0.031 eV
Asteroids ________.
A. are about the same size as planets, but have not pulled themselves into a spherical shape B. are small bodies, typically the size of a grain of sand or a boulder C. are larger objects, a few hundred kilometers in size, but not quite large enough to be classified as a planet D. can range in size from a few meters to many hundreds of kilometers
The position of an air-track cart that is oscillating on a spring is given by x = (12.4 cm) cos[(6.35 s-1)t]. At what value of t after t = 0 s is the cart first located at x = 8.47 cm?
A) 4.34 s B) 0.108 s C) 0.129 s D) 7.39 s E) 7.75 s