Concrete is a composite with a matrix of hydrated _________cement, and the reinforcement is aggregate with sizes ranging from fine sand to coarse rocks.
Fill in the blank(s) with the appropriate word(s).
Portland
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A ball with a diameter of 10.0 cm is submerged in water. The buoyant force of the water on the ball is
A. 4.25 N. B. 4.75 N. C. 5.13 N. D. 5.75 N. E. 6.00 N.
Based on current understanding, what exactly is causing the expansion of the universe to accelerate?
A) WIMPs B) neutrinos C) white dwarf supernovae D) Gravity E) We don't know, but we call it "dark energy."
When a net force on a moving object increases, the object will
a. maintain the same velocity. b. always show an increase in speed. c. exhibit a change in speed and/or direction. d. maintain a constant acceleration.
A student kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory:
A) both velocity and acceleration of the soccer ball are zero. B) neither the ball's velocity nor its acceleration is zero. C) the ball's acceleration is zero but not its velocity. D) the ball's acceleration points upwards. E) the ball's velocity points downwards.