Why should the smallest particulates cause the greatest health problems? Explain
What will be an ideal response?
These particles are much smaller than the salt particles near the sea and typical
dust particles to which our ancestors were exposed. This means that humans have no
evolutionary defense mechanisms for such tiny particles, and they can travel unimpeded into
the lungs and form loci that can lead to lung disease.
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According to Kepler's third law, the square of the planet's period in years is:
A) equal to its perihelion distance from the Sun in A.U. B) inversely proportional to its mass in kilograms. C) equal to the fourth power of its average temperature in degrees Kelvin. D) proportional to the cube of its semimajor axis in A.U. E) equal to the square of its aphelion distance in A.U.
Consider a spacecraft that travels round-trip to the zeta reticuli star system (distance 39.5 light-years) at 99% of the speed of light
If the round-trip travel time as measured from Earth is 79.8 years, how much time would pass for passengers on the spacecraft? A) 39.9 years B) 79.8 years C) 22.6 years D) 11.3 years
A ping-pong ball is dropped vertically onto a stationary bowling ball resting on the floor. Which of the balls experiences the greater force as a result of the collision?
A. The ping-pong ball B. The bowling ball C. Neither, both experience forces of the same size D. It's impossible to tell from this data
When an atom emits a photon, the atom's mass
A) decreases slightly. B) remains exactly the same. C) increases slightly. D) could do any of the above. E) becomes negative--i.e., less than zero.