In semi-crystalline polymers, there is a spike in the specific heat when the crystallites start to _____________.
Fill in the blank(s) with the appropriate word(s).
melt
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A 6.0
resistor and a 3.0
resistor are connected in parallel to a 1.5 V battery of negligible internal resistance. What is the current in the 3.0
resistor?
A. 2.0 A B. 0.50 A C. 0.25 A D. 0.17 A E. 0.75 A
S seismic waves can travel only through ______________ material
Fill in the blank(s) with correct word
When a force is called a "normal" force, it is
A. the usual force expected given the arrangement of a system. B. a force that is perpendicular to the surface of the Earth at any given location. C. a force that is always vertical. D. a contact force perpendicular to the contact surfaces between two solid objects. E. the net force acting on a system.
The figure below shows a planet traveling in a clockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
a.
its speed is constant.
b.
its speed is increasing.
c.
its speed is decreasing.
d.
its speed is a maximum.
e.
its speed is a minimum.