In the above model of an atom, where is the neutron located, assuming a neutron is present?
a. A
b. 1
c. 2
d. 3
A
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If a crystal has a fourfold axis of symmetry, the crystal can be rotated by _________degrees about this axis and the diffraction pattern will look exactly the same.
Fill in the blank(s) with the appropriate word(s).
On average, how often do impactors about 10 km in size, large enough to produce mass extinction, hit Earth?
What will be an ideal response?
When a pair of 10-N forces act on a box of candy, the net force on the box is
A) zero. B) about 14 N. C) 20 N. D) Any of the above depending on the directions of forces.
An object of 1.0 kg mass is pulled up an inclined plane by a constant force of 10 N that causes a displacement of 0.50 m. The angle of inclination with the horizontal is 30°. Neglect friction and use g = 10 m/s2. What is the work done by the net force on the object along the inclined plane?
A) 4.3 J B) 4.3 kg m/s2 C) 0 J D) 2.5 J