Which of the following is true about frictional forces?
a. They are stored as frictional potential energy.
b. They can decrease kinetic energy.
c. They can increase kinetic energy.
d. They produce heat potential energy.
e. They eventually convert to electromagnetic potential energy.
b
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The isotope 99m Tc (half-life of 6.0 hours) is used in bone scans. How long does it take a quantity of 99m Tc to reduce to 1% of its initial activity?
A) 0.06 hours B) 3.3 hours C) 33 hours D) 40 hours E) slightly more than one month
The particle in an atom that carries a negative charge is the ____
a. nucleon b. electron c. negatron d. proton e. neutron
In the relativistic case, doubling the speed of an electron causes its wavelength to
A) double. B) more than double. C) halve. D) decrease to less than one-half. E) quadruple.
A hidden link that looks like body text until point to it, at which time it changes color is a(n) ______ link.
A. hot spot B. formatted C. image D. rollover