Misty throws a stone horizontally from the roof edge of a 50. meter high dormitory. It hits the ground at a point 60. m from the building
(a) Determine the horizontal component of velocity just before hitting the ground.
(b) What vertical speed did it have just before hitting the ground?
(a) 19. m/s
(b) 31. m/s
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An object is moving with constant non-zero velocity on the +x axis. The velocity versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.
Carbon-14 has a half-life of 5730 y. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.144 Bq/g
By comparing this activity with the activity of living organic matter, 0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. How old is the sample of wood? A) 3870 y B) 4250 y C) 4590 y D) 2630 y E) 2940 y
A bat, flying due east at 2 m/s, emits a shriek that is reflected back to it from an oncoming insect flying directly toward the bat at 4 m/s. The insect is 20 m from the bat at the instant the shriek is emitted. Sound travels 340 m/s in air
After what elapsed time does the bat hear the reflected echo?
What does the prefix pico- stand for?
What will be an ideal response?