The nuclear force is:
a. weaker than the electromagnetic force.
b. almost independent of charge.
c. long range.
d. stronger with positively charged particles.
e. always negatively charged.
b
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If the kinetic energy of a ball is doubled, then the momentum is
A. 0.50 times larger. B. 0.71 times larger. C. 1.00 times larger. D. 1.41 times larger. E. 1.50 times larger.
What features are unique to Earth?
A. an atmosphere B. precipitation C. volcanoes D. canyons E. None of these features is unique to Earth.
In the 19th century, Charles Darwin suggested that life may have originated
A) in shallow ponds on land B) deep beneath the oceans C) beneath the surface of the Earth D) in the atmosphere
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms). What is the speed of the particle as it moves along this path?
A. 0.13 km/s B. 0.10 km/s C. 0.16 km/s D. 0.23 km/s E. 0.06 km/s