What is the speed, as a fraction of , of a particle whose momentum is ?
We have to find the speed as a fraction of , of a particle whose momentum is .
We will use the below formula
From the above formula we will find the speed value,
Teenagers Sam and Tom are playing chicken in their rockets. As FIGURE Q36.2 shows, an experimenter on earth sees that each is traveling at as he approaches the other. Sam fires a laser beam toward Tom.
a. What is the speed of the laser beam relative to Sam?
b. What is the speed of the laser beam relative to Tom?
You are standing at and your assistant is standing a Lightning bolt strikes at and a lightning bolt strikes at . You see the flash from bolt at and the flash from bolt According to your assistant, were the lightning strikes simultaneous? If not, which occurred first, and what was the time difference between the two?
The radioactive element radium (Ra) decays by a process known as alpha decay, in which the nucleus emits a helium nucleus. (These high-speed helium nuclei were named alpha particles when radioactivity was first discovered, long before the identity of the particles was established.) The reaction is , where Rn is the element radon. The accurately measured atomic masses of the three atoms are , , and . How much energy is released in each decay? (The energy released in radioactive decay is what makes nuclear waste “hot.”)
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