Spring tides occur
a. only in March.
b. when Earth, the Moon, and the Sun line up.
c. fewer than 10 times a year.
d. once a month.
b
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About 540 million years ago, a sudden increase in biological complexity occurred, known as the _______________
Fill in the blank(s) with correct word
In a laboratory accident a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and, after correcting for the background rate, obtain the data shown in the table
Time (days) 0 2 6 11 19 30 Counts/min 1000 899 727 557 364 202 The accident occurred at t = 0. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 133 counts per minute. Of the choices listed below, which one is the earliest time that workers could safely return? A) 38 days B) 44 days C) 50 days D) 32 days E) 24 days
Astronaut Rob leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth
Rob's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year). Relative to a frame of reference that is fixed with respect to Earth, how long does it take Rob to complete the trip? A) 14.4 years B) 15.0 years C) 10.8 years D) 4.20 years E) 22.7 years
If a cosmic-ray proton, an alpha particle, and a 6Li nucleus all have the same kinetic energy, then which one has the lowest speed?
a. the proton b. the 6Li nucleus c. the alpha particle d. All cosmic rays have the same speed, c.