Three particles are placed in the xy plane. A 40-g particle is located at (3, 4) m, and a 50-g particle is positioned at (?2, ?6) m. Where must a 20-g particle be placed so that the center of mass of this three-particle system is located at the origin?
a. (?1, ?3) m
b. (?1, 2) m
c. (?1, 12) m
d. (?1, 7) m
e. (?1, 3) m
d
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A horizontally-projected beam of protons travelling at 55 km/s travels between two parallel plates separated by 7.4 cm, and 12 cm long, between which there is an electric field of 7.2 mV/m upward. If the beam enters the region at exactly midway vertically between the plates, and exits the region 7.2 microns closer to the lower plate, where relative to the lower plate would a beam of electrons – injected into the region at the same location – exit? The proton mass is 1.67 x 10-27 kg and that of the electron is 9.11 x 10-31 kg.
A. 0.9 cm B. 5.1 cm C. 2.3 cm D. 4.6 cm
The explosion in a cannon exerts an average force of 30,000 N for 2.00 meters. The velocity of a 2.00 kg projectile shot from the cannon is
A. 198 m/s. B. 245 m/s. C. 302 m/s. D. 354 m/s. E. 412 m/s.
Which tin can will roll down an incline in the shortest time, one filled with water or one filled with ice? (Hint: water 'slides' inside the can.)
A) with water B) with ice C) both the same D) need more information
A wave is traveling in a string at 60 m/s. When the tension is then increased 60%, what will be the resulting wave speed?
a. also 60 m/s c. 71 m/s b. 76 m/s d. 55 m/s