An isotope of Tc having a half-life of 6.0 h is used in bone scans. If a certain amount of this Tc is injected into the body, how long does it take for its initial decay rate to decrease BY 99%?
A) 0.060 h
B) 3.3 h
C) 33 h
D) 40 h
E) slightly more than a month
Answer: D
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A 40.0-kg box is being pushed along a horizontal, smooth surface. The pushing force is 15.0 N directed at an angle of 15.0° below the horizontal. What is the acceleration of the crate?
A) 0.158 m/s2 B) 0.362 m/s2 C) 0.466 m/s2 D) 0.375 m/s2 E) 0.684 m/s2
In the future, adaptive optics will greatly enhance the resolution of the Hubble Space Telescope
Indicate whether the statement is true or false
One way in which the ionizing radiation occurring naturally in the environment has been beneficial to the human race is
A) the application of solar radiation to the treatment of cancer. B) in the operation of the electron microscope. C) in making nuclear fission possible. D) in producing the mutations that are essential for the process of evolution. E) nonsense--there are no beneficial uses of naturally-occurring high-energy radiation.
An ideal gas is taken around the process shown. The net work done on the gas is most nearly: