When a nucleus in an excited state decays to the ground state, the particle emitted is
a. an alpha particle.
b. a beta particle.
c. a gamma ray.
d. an x-ray.
e. none of the above.
c
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A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed will its gravitational potential energy (relative to the base of the cliff) be equal to its kinetic energy?
A) 3.1 m/s B) 4.4 m/s C) 6.3 m/s D) 8.9 m/s E) 13 m/s
An object is acted upon by the three forces shown. In order to move the object upward,
A. an upward force of at least 55 N must be applied. B. an upward force of at least 25 N must be applied. C. an upward force of at least 5 N must be applied. D. any upward force can be applied. E. an upward force of at least 30 N must be applied.
A compound is a stable chemical substance composed of two or more ________.
Fill in the blank(s) with the appropriate word(s).
A uniform electric field has a magnitude of 10 N/C and is directed upward. A charge brought into the field experiences a force of 2.0 N upward. The charge must be
A. +20 C. B. -2.0 C. C. -20 C. D. -0.2 C. E. +0.2 C.