A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m. What is the initial speed of the ball?
A) 9.8 m/s
B) 20 m/s
C) 35 m/s
D) 4.9 m/s
E) 70 m/s
C
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The crystals in matter are held together by
A) cohesive forces. B) amorphous forces. C) electrical bonding forces. D) excess neutrons.
The magnetic field lines produced by a current in a straight wire
A. are directed outward in a direction perpendicular to the wire B. are directed in concentric circles around the wire C. begin on one side of the wire and end on the other side of the wire
We have a hollow metallic sphere with charge +5.0 µC and radius 5.0 cm. We insert a -10 µC charge at the center of the sphere through a hole in the surface. What charge now rests on the outer surface of the sphere?
a. +10 µC c. -5 µC b. +5 µC d. +15 µC
In the core of high-mass stars, the energy is transported by convection currents.
Answer the following statement true (T) or false (F)