An object 50-cm high is placed 1.0 m in front of a converging lens whose focal length is 1.5 m. Determine the image height (in cm)
a. 77
b. 150
c. 52
d. 17
e. 83
b
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A packing crate rests on a horizontal surface. It is acted on by three horizontal forces: 600 N to the left, 200 N to the right, and friction. The weight of the crate is 400 N. If the 600-N force is removed, the resultant force acting on the crate is
A) zero. B) 200 N to the right. C) 200 N to the left. D) 400 N to the left. E) impossible to determine from the information given.
When a nucleus in an excited state decays to the ground state, a(n) __________ particle is emitted
Fill in the blank(s) with correct word
In the Doppler effect for electromagnetic waves, which of the following gives the greatest shift in frequency?
a. the source moving toward the non-moving observer at speed v b. the observer moving toward the non-moving source at speed v c. the source moving toward the approaching observer, both at speed v/2 d. All of the above give the same shift.
A proton's rest mass is 1.67 × 10^-27 kg. Calculate its kinetic energy when it is accelerated to a speed of 0.80 c
a. 1.0 × 10^-10 J b. 1.5 × 10^-10 J c. -2.0 × 10^-10 J d. 2.5 × 10^-10 J e. 7.5 × 10^-10 J