Earthquakes are caused by the
A) friction between diverging plates.
B) sudden release of energy that is stored elastically in deforming rocks.
C) expansion of Earth's crust.
D) combined motion of tectonic plates.
Answer: B
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When a proton and an antiproton collide
a. they destroy each other and produce energy in the form of gamma rays. b. one of the protons is converted to a neutron and they form nucleus of one proton and one neutron. c. one of the protons is converted to an electron and they form a hydrogen atom. d. one proton is converted to a neutron and the other is converted to an electron. e. A proton and an antiproton can not collide because the Coulomb barrier is too great.
On a frictionless tabletop, a force is applied to an object: the object's velocity is horizontal and the force is perpendicular to the tabletop. Which of the following is true?
A. The total energy of the object does not change B. The applied force is friction C. There cannot be more than one force on the object D. The force does work on the object
The standard kilogram is a platinum-iridium cylinder 39.0 mm in height and 39.0 mm in diameter. What is the density of the material?
a. 21.5 g/cm3 c. 13.6 g/cm3 b. 19.3 g/cm3 d. 10.7 g/cm3
The geographical area that contributes groundwater and runoff to any particular stream is called the ?
What will be an ideal response?