Which one of the following processes CANNOT occur?
A) ?- + p ? n + ?
B) ?0 ? 2?
C) ?+ ? ?+ + v?
D) ?- ? ?- + p
E) ?+ + p ? K+ + ?+
D
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Since matter is made of electrically charged particles, why don't we feel electric forces all the time?
A) Because electric forces cannot be exerted across the nearly empty space. B) Because there is no electric current in ordinary matter, so there can be no net macroscopic effect. C) Because matter contains as many electrons as protons, leading to no net macroscopic effect. D) Because the atoms in each small portion of ordinary matter are at rest, so they produce no electromagnetic force. E) Because the effect of the electric force is absorbed by the air that normally surrounds us.
A flatbed truck is carrying a 20-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.40, and the coefficient of kinetic friction is 0.30
What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place? A) 13° B) 0.38° C) 17° D) 68° E) 22°
You are in a desert and you are thirsty. You come upon a deep well hole and you see water about 11 meters down. You take a long tube and you try to drink the water by sucking on the tube. Compared to drinking with a cup with a standard 20 cm straw, in this case, drinking would be
1.much easier. 2.about the same level of difficulty. 3.more difficult. 4.impossible.
What is the probability of rolling either a 7 or 11 on a single roll of a pair of dice?
a. 1/6 b. 2/9 c. 3/8 d. 1/3 e. 1/2