The singularity of a black hole is where general relativity predicts the density to become infinite
Indicate whether the statement is true or false
TRUE
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Which of these is a longitudinal wave
A) sound B) light C) radio D) all of the above E) none of the above
A potential energy function for system 1 is given by U1(x) = Cx2 + Bx3. The potential energy function for system 2 is given by U2(x) = A + Cx2 + Bx3, where A is a positive quantity
How does the force on system 1 relate to the force on system 2 at a given position? A) The force on the two systems will be in opposite directions. B) The force is identical on the two systems. C) The force on the second system will be with less than the force on the first system. D) There is no relationship between the forces on the two systems. E) The force on the second system will be with greater than the force on the first system.
If Q = 16 nC, a = 3.0 m, and b = 4.0 m, what is the magnitude of the electric field at point P?
a.
33 N/C
b.
31 N/C
c.
24 N/C
d.
19 N/C
e.
13 N/C
A bar of diameter d 5 18 mm and length L 5 0.75 m is loaded in tension by forces P. The bar has modulus E 5 45 GPa and allowable normal stress of 180 MPa. The elongation of the bar must not exceed 2.7 mm. The allowable value of forces P is approximately:
(A) 41 kN
(B) 46 kN
(C) 56 kN
(D) 63 kN
