If a product requires a high elastic modulus, which class of materials can be eliminated from consideration?
(a) Metals
(b) Polymers
(c) Ceramics
(d) Composites
(b) Polymers
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A boulder is thrown into a deep lake. As it sinks deeper and deeper in the water the buoyant force
1) increases. 2) decreases. 3) remains the same. This is because the 4) pressure increases with greater depth. 5) pressure decreases with greater depth. 6) volume and weight of displaced water are the same at any depth.
A airplane that is flying level needs to accelerate from a speed of 2.00 × 102 m/s to a speed of 2.40 × 102 m/s while it flies a distance of 1.20 km. What must be the acceleration of the plane?
A) 4.44 m/s2 B) 2.45 m/s2 C) 7.33 m/s2 D) 5.78 m/s2 E) 1.34 m/s2
Would you be richer if you had a hunk of gold whose weight is 1 newton on the moon, or one whose weight is 1 newton on Earth, and why?
A) 1 newton on the moon, because then the gold's weight on the moon would be larger. B) 1 newton on the moon, because then the gold's mass would be larger. C) 1 newton on Earth, because then the gold's mass would be larger. D) 1 newton on Earth, because then the gold's weight on Earth would be larger. E) It wouldn't make any difference, because the amount of actual gold would be the same in both cases.
A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming negligible air resistance?
A) 9.8 m/s B) 25 m/s C) 49 m/s D) 98 m/s