A hockey puck slides off the edge of a table at point A with an initial velocity of 20.0 m/s and experiences no air resistance. The height of the tabletop above the ground is 2.00 m
(a) What is the speed (not the velocity) of the puck just before it touches the ground?
(b) What is the distance between point A and the point where the puck hits the ground?
What will be an ideal response?
Answer: (a) 21.0 m/s (b) 12.9 m
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John is nearsighted and cannot see things beyond 90 cm from his eyes. What is the refractive power of the contact lenses that will enable him to see distant objects clearly?
A) +1.1 diopters B) -1.1 diopters C) -1.7 diopters D) -2.2 diopters E) +2.2 diopters
A farsighted person cannot see clearly objects that are closer to her eyes than 60.0 cm
Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable her to comfortably see the objects at a distance of 25.0 cm from her eyes? A) -42.9 cm, +2.33 diopters B) -42.9 cm, -2.33 diopters C) +42.9 cm, +2.33 diopters D) +42.9 cm, -2.33 diopters E) +60 cm, +42.9 diopters
The critical density for the Universe is about
A. equal to six hydrogen atoms per cubic meter. B. the same as the density of the Sun. C. equal to 6,000 hydrogen atoms per cubic meter. D. the same as the density of Earth. E. equal to 600,000 hydrogen atoms per cubic meter.
In a ballistics test, a 1.50-g bullet is fired through a 28.0-kg block traveling horizontally toward the bullet
In this test, the bullet takes 11.4 ms to pass through the block as it reverses the block's velocity from 1.75 m/s to the right to 1.20 m/s to the left with constant acceleration. Find the magnitude of the force that the bullet exerts on the block during this ballistics test.