Energy Conservation With Nonconservative Forces: As shown in the figure, a 4.0-kg block is moving at 5.0 m/s along a horizontal frictionless surface toward an ideal spring that is attached to a wall. After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m. What is the speed of the block when the spring is compressed to only one-half of the maximum distance?
Fill in the blank(s) with the appropriate word(s).
4.3 m/s
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Which of the following is not a characteristic of superplasticity?
(a) Grains elongate in the direction of flow. (b) Temperatures are above half of the melting temperature. (c) The material is highly strain-rate sensitive. (d) A strain rate of approximately 10-3 s-1.
Water is flowing through a pipe whose cross-sectional area at point A is larger than the cross-sectional area at point B. The reading on a pressure gauge connected to the pipe at point A will be _____________ the reading on a pressure gauge connected to the pipe at point B
a. the same as b. higher than c. lower than d. unrelated to
According to the Big Bang theory, ordinary matter did not exist in the first microsecond after the beginning. All the matter in the universe was a sea of ________.
Fill in the blank(s) with the appropriate word(s).
In what phase of matter are the particles no longer moving?
A) solid B) liquid C) gas D) none of the above