Chapter 1: Q31 PE (page 11)
How many times longer than the mean life of an extremely unstable atomic nucleus is the lifetime of a human? (Hint: The lifetime of an unstable atomic nucleus is on the order of 10-22s
Hence, the lifetime of an unstable atomic nucleus is times longer
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(a) Find the size of the smallest detail observable in human tissue with 20MHz ultrasound. (b) Is its effective penetration depth great enough to examine the entire eye (about 3.00cm is needed)? (c) What is the wavelength of such ultrasound in air \[{0^o}{\rm{C }}\]?
Tectonic plates are large segments of the Earth’s crust that move slowly. Suppose that one such plate has an average speed of\({\bf{4}}.{\bf{0}}{\rm{ }}{{{\rm{cm}}} \mathord{\left/ {\vphantom {{{\rm{cm}}} {{\rm{year}}}}} \right. \\} {{\rm{year}}}}\). (a) What distance does it move in\({\rm{1 s}}\)at this speed? (b) What is its speed in kilometers per million years?
Find the components of \({v_{tot}}\) along a set of perpendicular axes rotated \(30^\circ \) counterclockwise relative to those in Figure 3.55.
Figure: The two velocities\({{\rm{v}}_{\rm{A}}}\)and\({{\rm{v}}_{\rm{B}}}\)add to give a total \({{\rm{v}}_{{\rm{tot}}}}\)
Three adjacent keys on a piano (F, F-sharp, and G) are struck simultaneously, producing frequencies of 349, 370 and 392 Hz. What beat frequencies are produced by this discordant combination?
A ball is thrown straight up. It passes a 2.00 m highwindow 7.50 moff the ground on its path up and takes 1.30sto go past the window. What was the ball’s initial velocity?
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