When a 60-Hz voltage is applied to a 22-?F capacitor, the capacitive reactance is
A) 121 ?.
B) 760 ?.
C) 13 × 10-4 ?.
D) 510 ?.
E) 83 × 10-4 ?.
A
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The great contribution of Tycho Brahe was to ________
A) offer the first detailed model of a Sun-centered solar system, thereby beginning the process of overturning the Earth-centered model of the Greeks B) observe planetary positions with sufficient accuracy so that Kepler could later use the data to discover the laws of planetary motion C) discover four moons orbiting Jupiter, thereby lending strong support to the idea that the Earth is not the center of the universe D) discover that planets orbit the Sun in elliptical orbits with varying speed
A particle moving along the x axis has a position given by x = (24t – 2.0t3) m, where t is measured in s. What is the magnitude of the acceleration of the particle at the instant when its velocity is zero?
a. 24 m/s2 b. zero c. 12 m/s2 d. 48 m/s2 e. 36 m/s2
State the specific heat of water in terms of standard SI energy units (joules)
Rutherford's scattering equation question
Scattering one unknown particle of Z1 off of another, much more massive target particle of Z2, you observe a certain number of particles scattered at an angle
(your detector is of width 
, at an angle
from the beam axis, centered at an angle 
around the beam axis). Use Rutherford's scattering equation (and assumptions) to determine which of the following changes to the experiment would be most likely to increase the number of particles you detect with your detector.
increase the velocity of the scattering particles.
a. increase the angle around the beam axis.
b. increase the cross section of the target nuclei.
c. increase the number of neutrons in the scattering nuclei.
d. increase the number of electrons in the target nuclei.