Two blocks in contact with each other are pushed to the right across a rough horizontal surface by the two forces shown. If the coefficient of kinetic friction between each of the blocks and the surface is 0.30, determine the magnitude of the force exerted on the 2.0-kg block by the 3.0-kg block
a.
15 N
b.
25 N
c.
11 N
d.
22 N
e.
33 N
d
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Three coplanar parallel straight wires carry equal currents I to the right as shown below. The current in the upper two wires is directed to the right, but the current in the bottom wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.
A goldfish bowl is spherical, 8.0 cm in radius. A goldfish is swimming 3.0 cm from the wall of the bowl. Where does the fish appear to be to an observer outside? The index of refraction of water is 1.33
Neglect the effect of the glass wall of the bowl. A) 3.3 cm inside the bowl B) 3.9 cm inside the bowl C) 2.5 cm inside the bowl D) 3.0 cm inside the bowl E) 1.7 cm inside the bowl
Glacial striations on the continental landmasses provide evidence
A) that Hawaii was once joined to Alaska. B) of the direction of Pleistocene ice flow. C) that the Cenozoic was a very cool time. D) that Baja California was once joined to Mexico.
Vectors A , B, C and have magnitudes 6, 11, and 22. When these vectors are added, what is the least possible magnitude of their addition?
A. 25 B. 15 C. 5 D. 3