A tiny gun made of a strong but very light material fires a bullet more massive than the gun itself. For such a weapon
A) the target would be safer than the shooter.
B) recoil problems would be lessened.
C) conservation of energy would not hold.
D) conservation of momentum would not hold.
E) both conservation of energy and momentum would not hold.
Answer: A
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A design requires a material that must have a high melting temperature, high stiffness, high compressive strength, low density, and low cost. Which of the following materials is most likely to best satisfy the design requirements?
(a) Alumina ceramic (b) Carbon steel (c) Polyethylene (d) Graphite-reinforced-epoxy composite
Which of the following statements about the celestial equator is true at all latitudes?
A) It lies along the band of light we call the Milky Way. B) It represents an extension of Earth's equator onto the celestial sphere. C) It cuts the dome of your sky exactly in half. D) It extends from your horizon due east, through your zenith, to your horizon due west. E) It extends from your horizon due north, through your zenith, to your horizon due south.
The magnetic field in a region of space is parallel to the surface of a long flat table. Imagine that this page is lying flat on the table. When current is present in the coil, which is lying on the table, the coil tends to rotate so that the left side moves up and the right side moves down. The magnetic field is
a.
directed parallel to the page and downwards.
b.
directed parallel to the page and upwards.
c.
directed parallel to the page and to the right.
d.
directed parallel to the page and to the left.
e.
in a direction that cannot be determined in this experiment
If a constant non—zero force is applied to an object, its velocity will certainly ________
a. change b. stop c. be zero d. be constant e. equal acceleration