Where do scientists find the key evidence linking the extinction of the dinosaurs to the impact of an asteroid or comet?
A. in sediments that surround a large crater in Mexico
B. in sediments separating rocks from the time when dinosaurs existed from those deposited after dinosaurs were no longer found
C. in rock brought up by drilling deep into Earth's mantle
D. in sediments found on the ocean bottom near mid-ocean ridges
E. in rocks returned from craters on the Moon
Answer: B. in sediments separating rocks from the time when dinosaurs existed from those deposited after dinosaurs were no longer found
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A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating counterclockwise and then clockwise.
Thin Lenses: A convex lens has focal length f. If an object is placed at a distance beyond 2f from the lens on the principal axis, the image is located at a distance from the lens
A. of 2f. B. between f and 2f. C. of f. D. between the lens and f. E. of infinity.
A lens that is thicker at the center than at the edge is called a(n) ______________ lens
Fill in the blank(s) with correct word
How fast would a rocket ship have to move to contract to half of its proper length (as observed by a stationary object)?
A) 0.25c B) 0.50c C) 0.65c D) 0.78c E) 0.87c