Monochromatic light of wavelength 500 nm is incident normally on a diffraction grating. If the third-order maximum of the diffraction pattern is observed at 32.0°, what is the total number of maxima can be seen?
A) 5
B) 7
C) 10
D) 11
E) 8
D
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As a car goes up a hill, there is a force of friction between the road and the tires rolling on the road. The maximum force of friction is equal to:
a. the weight of the car times the coefficient of kinetic friction. b. the normal force of the road times the coefficient of kinetic friction. c. the normal force of the road times the coefficient of static friction. d. zero.
At the highest point on the path of a projectile, its vertical acceleration
a. equals g pointing downwards. b. equals g pointing upwards. c. is zero. d. is undetermined. e. does not exist.
A 12.0-N object is oscillating in simple harmonic motion at the end of an ideal vertical spring
Its vertical position y as a function of time t is given by y(t) = 4.50 cm cos[(19.5 s-1)t - ?/8]. (a) What is the spring constant of the spring? (b) What is the maximum acceleration of the object? (c) What is the maximum speed that the object reaches? (d) How long does it take the object to go from its highest point to its lowest point?
Quasars are common in the early Universe because ____ at that time
a. galactic collisions were more frequent b. black hole collisions were more frequent c. gas and dust clouds were denser d. galaxies were more isolated e. central bulges were larger