When a neutron decays to create a proton, another particle emitted is a(n)
a. alpha particle
b. beta particle
c. gamma ray
d. x ray
e. none of the above
B
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In a relay race, runner A is carrying the baton and has a speed of 2.80 m/s. When he is 25.0 m behind the starting line, runner B starts from rest and accelerates at 0.0800 m/s2. How long afterwards will A catch up with B to pass the baton to B?
A) 5.17 s B) 10.5 s C) 11.9 s D) 20.4 s E) Runner A never catches up.
Ultrasonic sound that travels at 1530 m/s in ocean water is bounced off the ocean floor and returns to the ship above. If the round trip takes 3 s, the depth of the water is
A) 1530 m. B) 2295 m. C) 3060 m. D) 4590 m.
A brass cube, 10 cm on a side, is raised in temperature by 150°C. The coefficient of volume expansion of brass is 57 × 10^-6/°C. By what percentage is any one of the 10-cm edges increased in length?
a. 4% c. 0.38% b. 2.8% d. 0.29%
The earth's northern magnetic pole acts like
A) it has negative charge. B) it has positive charge. C) it has no charge. D) the north pole of a magnet. E) the south pole of a magnet.