A charge per unit length given by l(x) = bx, where b = 12 nC/m2, is distributed along the x axis from x = +9.0 cm to x = +16 cm. If the electric potential at infinity is taken to be zero, what is the electric potential at the point P on the y axis at y = 12 cm?
a. 5.4 V
b. 7.2 V
c. 9.0 V
d. 9.9 V
e. 16 V
A
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A turntable has a moment of inertia of 3.0 × 10^-2 kg•m2 and spins freely on a frictionless bearing at 25 rev/min. A 0.60-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.10 m from the center. By what factor does the kinetic energy of the system change after the putty is dropped onto the turntable?
a. 0.91 c. 0.83 b. 1.0 d. 1.5
A laser produces a beam of 4000-nm light. A shutter allows a pulse of light, 30 ps in duration, to pass
Which of the following is closest to the uncertainty in the energy of a photon in the pulse? ( h = 1.055 × 10-34 J • s = 6.59 × 10-16 eV • s) A) 10-3 eV B) 10-6 eV C) 10-4 eV D) 10-2 eV E) 10-5 eV
State the work-energy principle
What will be an ideal response?
You stand with your heels against a wall and bend ninety degrees forward at the waist.
A. You fall forward because your center of gravity moves ahead of your base of support. B. You fall forward because of the momentum you gain when you move. C. You fall forward because the muscles in your feet aren't strong enough to stop you. D. You are able to maintain your balance.