A block is pushed up a 20.0° frictionless incline with an initial speed 12.0 m/s. (a) How high up the plane does the block slide before coming to rest? (b) How much time does it take to return to its starting position?
What will be an ideal response?
(a) 21.5 m
(b) 7.15 s
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Which of the following correctly describes the situation when Jackie returns to Earth? (Ages in this problem refer to biological ages—that is, how much time has passed for each sister since she was born.)
A) It's the year 2050, and both twin sisters are 70 years old. B) It's the year 2050. Gwen (who stayed home) is 70 years old, but Jackie is only a little older than her age of 20 when she left. C) It's the year 2050. Gwen is 70 years old. Jackie is 19. D) It's the year 2100. Gwen and Jackie are both 120 years old. E) According to Gwen, Jackie returns to Earth in the year 2050, but according to Jackie, she returns in the year 2001.
A rock is thrown from the edge of the top of a 100-ft tall building at some unknown angle above the horizontal. The rock strikes the ground a horizontal distance of 160 ft from the base of the building 5.0 s after being thrown. Assume that the ground is level and that the side of the building is vertical. Determine the speed with which the rock was thrown.
A. 72 ft/s B. 77 ft/s C. 68 ft/s D. 82 ft/s E. 87 ft/s
A 460-turn solenoid of length 30.0 cm and radius 4.00 cm carries a current of 3.50 A. What is the magnetic field strength inside the coil at its midpoint?What is the magnetic field strength inside the coil at its midpoint?
a. 2.02E–3 T b. 6.74E–3 T c. 6.07E–4 T d. 4.95E–5 T
The frequency of blue light is ________ that of green light.
A. less than B. greater than C. the same as D. greater than, the same as, or less than, depending on a source of light