The first minerals to crystallize from a cooling magma have a
What will be an ideal response?
high melting point and a low silica content.
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Equilibrium: A child is trying to stack two uniform bricks, each 24 cm long, so they will protrude as far as possible over the edge of a table without tipping over, as shown in the figure. What is the maximum possible overhang distance d?
A. 10 cm B. 12 cm C. 14 cm D. 16 cm E. 18 cm
The cause of the pulsations we see in the light from neutron stars is
A) the in and out pulsations of star's radius, as the star gets rapidly larger and then smaller. B) pulsations of its neutrons. C) the spinning motion of the star. D) motions of electrons within the star. E) Nonsense--neutron stars do not pulsate.
The isotope 64Zn has a nuclear radius of 4.8 × 10^?15 m. Which of the following is the mass number of an isotope for which the nuclear radius is 3.6 × 10^?15 m?
a. 3 b. 1 c. 9 d. 27 e. 48
You may have noticed that when you get out of a swimming pool and stand dripping wet in a light breeze, you feel much colder than you feel after you dry off. Why is this?
A) The moisture on your skin has good thermal conductivity. B) Water has a relatively large heat capacity. C) This is a purely psychological effect resulting from the way in which sensory nerves in the skin are stimulated. D) The water on your skin is colder than the surrounding air. E) 540 calories of heat are required to evaporate each gram of water from your skin, and most of this heat flows out of your body.