A child, whose weight is 150 newtons, lifts a pumpkin from the ground with a force of 50 newtons. The force the pumpkin exerts on the child is
A. 50 newtons.
B. zero.
C. more than 50 newtons.
D. greater than zero but less than 50 newtons.
Answer: A
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If a metal has a low cohesive energy, the metal is expected to have a ______________hardness.
Fill in the blank(s) with the appropriate word(s).
Mars currently lacks surface habitability mostly because of
A) the chemical composition of its atmosphere B) its distance from the Sun C) its small size D) the chemical composition of its surface
When an electron collides with a positron the two particles
A) fuse to form a heavier particle B) bounce off each other C) are destroyed, producing a pair of high-energy gamma rays D) are destroyed, producing another pair of particles
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A) warm and humid. B) cool and wet. C) monsoonal. D) dry as deserts.