A glass rod is rubbed with nylon. The rod is then brought close to the metal knob of an electroscope. A person's finger briefly touches the knob on the far side and is then removed. After the rod is removed the charge on the electroscope will be ________.
Fill in the blank(s) with the appropriate word(s).
negative
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If a star that is 10 light-years away from Earth explodes, gravitational waves from the explosion will reach Earth in
A) less than 10 years. B) more than 10 years. C) 10 years.
A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thick- ness is 20 mm, and internal pressure is 2.0 MPa. The maximum tensile stress in the cylindrical part of the tank is approximately:
(A) 45 MPa
(B) 57 MPa
(C) 62 MPa
(D) 75 MPa
Vicki very closely examines her new ruby ring with the jeweler's "loop." The ruby appears 7.0 times larger through this lens than when she views it close-up without the "loop"
If her near point is 35 cm, what is the focal length of the lens of the "loop"? A) 5.8 cm B) 6.7 cm C) 4.2 cm D) 3.6 cm E) 7.0 cm
A 4.2-kg object, initially at rest, "explodes" into three objects of equal mass. Two of these are determined to have velocities of equal magnitudes (5.0 m/s) with directions that differ by 90°. How much kinetic energy was released in the explosion?
a. 70 J b. 53 J c. 60 J d. 64 J e. 35 J