What do you do to the control rods of a reactor in order to shut it down?
a. push them into the core
b. pull them out of the core
c. nothing—it's the cooling water that shuts down the reactor
d. none of the above
a
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The Sun's elliptical shape at sunset can be adequately explained by
A) Fermat's principle. B) the law of refraction. C) both of these D) neither of these
A flatbed truck is carrying a 20.0-kg crate down a sloping road inclined 15.0° below the horizontal. The coefficient of static friction between the crate and the bed is 0.400
What is the maximum acceleration that the truck can have if the crate is to stay in place? A) 1.25 m/s2 B) 0.625 m/s2 C) 2.50 m/s2 D) 3.16 m/s2 E) 6.33 m/s2
A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?
a. 2.0 m/s b. 2.7 m/s c. 4.9 m/s d. 2.4 m/s e. 3.6 m/s
In Active Figure 30.7, assume I1 = 2.00 A and I2 = 6.00 A. What is the relationship between the magnitude F1 of the force exerted on wire 1 and the magnitude F2 of the force exerted on wire 2?