FUNDAMENTALS OF PHYSICS - EXTENDED
12th Edition
ISBN: 9781119773511
Author: Halliday
Publisher: WILEY
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A linear particle accelerator using beta particles collides electrons with their anti-matter counterparts, positrons. The accelerated electron hits the stationary positron with a velocity of 98 x 106 m/s, causing the two particles to annihilate.If two gamma photons are created as a result, calculate the energy of each of these two photons, giving your answer in MeV (mega electron volts), accurate to 1 decimal place. Take the mass of the electron to be 5.486 x 10-4 u, or 9.109 x 10-31 kg.Note: Assume that the kinetic energy is also converted into the gamma rays, and is included in the two photons.
(a) Taking A = (6.00 î – 8.00 j) units,
B = (-8,00 Î + 3.00 j) units, and
C = (26.0 î + 19.0 ĵ) units, determine a
and b such that a à + b B + T = 0.
(b) A student has learned that a single equation cannot be
Figure P22
solved to determine values for more than one unknown in
it. How would you explain to him that both a and b can be
determined from the single equation used in part (a)?
Growth of yeast cells In a controlled laboratory experiment,
yeast cells are grown in an automated cell culture system that
counts the number P of cells present at hourly intervals. The num-
ber after t hours is shown in the accompanying figure.
250
200
150
100
50
0 1 2 3 4 5 6 7
a. Explain what is meant by the derivative P'(5). What are its
units?
b. Which is larger, P'(2) or P'(3)? Give a reason for your
answer.
c. The quadratic curve capturing the trend of the data points
(see Section 1.4) is given by P(t) = 6.10r2 – 9.28t + 16.43.
Find the instantaneous rate of growth when t = 5 hours.
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