At a depth of 1030 m in Lake Baikal (a fresh water lake in Siberia), the pressure has increased by 100 atmospheres (to about 107 N/m2)
By what volume has 1.0 m3 of water from the surface of the lake been compressed if it is forced down to this depth? The bulk modulus of water is 2.3 × 109 Pa.
A) 5.3 × 10-3 m3 B) 4.3 × 10-3 m3 C) 2.3 × 10-3 m3 D) 3.3 × 10-3 m3
B
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Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
A) Fusion can only proceed by the proton-proton chain and therefore requires that protons come close enough together to be linked up into a chain. B) Nuclei have to be very hot in order to fuse, and the only way to get them hot is to bring them close together. C) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. D) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are very close together.
Astronomers estimate that the age of the Solar System is about ________ years.
A. 4.6 billion B. 4.6 million C. 4.6 trillion D. 13.7 billion
A battery is responsible for supplying a constant current to a circuit
Indicate whether the statement is true or false
When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is 
. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ?sphere at the spherical surface to the flux ?cube at the surface of the cube is
A.
.B.
.C.
D.
.E.
.