The length of a certain wire is kept same while it's radius is doubled. What is the new resistance of this wire?
Answer: It is reduced by a factor of 4
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Angular Momentum: A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg ? m2 is rotating freely with an angular speed of 1.0 rad/s. Two people, each of mass 60 kg, are standing right outside the edge of the merry-go-round and suddenly step onto the edge with negligible speed relative to the ground. What is the angular speed of the merry-go-round right after the two people have stepped on?
A. 0.20 rad/s B. 0.40 rad/s C. 0.60 rad/s D. 0.80 rad/s E. 0.67 rad/s
In order for nuclear fusion to occur, atomic nuclei must overcome the ____ by colliding violently
a. coronal hole b. radiative zone c. convective zone d. dynamo effect e. Coulomb barrier
According to the principle of continuity, the velocity of a fluid multiplied by the cross section through which it flows at one point will equal the product of
A) velocity and cross section at another point. B) velocity and pressure at another point. C) a constraint factor. D) none of the above
What is the hardness of talc on the Mohs scale?
a. 1 b. 4 c. 7 d. 10