A ball is thrown upward. After the ball is released upward and is in the air, its acceleration
1.remains the same.
2.increases.
3.decreases and then increases.
4.increases and then decreases.
1
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If the part of an iceberg that extends above the water were suddenly removed, the
A) iceberg would sink. B) buoyant force on the iceberg would decrease. C) density of the iceberg would change. D) pressure on the bottom of the iceberg would increase. E) none of the above
It is not possible to resolve detail of objects smaller than the wavelength of the radiation being used
Indicate whether the statement is true or false
f the distance between two point charges remains constant while the size of one of the charges is quadrupled, the force between the charges is multiplied by
A. 1/4 B. 2 C. 4 D. 16
A particle with electric charge is fired into a region of space where the electric field is zero. It moves in a straight line. Can you conclude that the magnetic field in that region is zero?
1.Yes, you can. 2.No; the field might be perpendicular to the particle’s velocity. 3.No; the field might be parallel to the particle’s velocity. 4.No; the particle might need to have charge of the opposite sign to have a force exerted on it. 5.No; an observation of an object with electric charge gives no information about a magnetic field.