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.
7.25 × 103 N
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The cosmic background radiation comes from a time after the origin of the universe
a. when protons and neutrons were first formed. b. when the big bang first began to expand. c. the inflationary period. d. when gamma rays had enough energy to destroy nuclei. e. when electrons began to recombine with nuclei to form atoms.
A single-slit experiment uses light of wavelength 720. nm with a slit separation of 0.250 mm and a screen placed 2.7 m away
(a) What is the angular width of the central fringe? (b) What is the linear width of the central fringe on the screen? (c) What is the linear distance on the screen between the central maximum and the 1st order maximum?
A 1-centimeter cubed sugar cube scaled up by a factor of 10 has a volume of
A) 10 cm3. B) 100 cm3. C) 1000 cm3. D) none of the above
When an object experiences uniform circular motion, the direction of the acceleration is
A) in the same direction as the velocity vector. B) in the opposite direction of the velocity vector. C) is directed toward the center of the circular path. D) is directed away from the center of the circular path. E) depends on the speed of the object.