A 4.00 kg ball is moving at 3.00 m/s to the NORTH and a 5.00 kg ball is moving at 2.00 m/s to the NORTHWEST. The total momentum of the system is
A. 20.3 kg m/s at an angle of 89.7 degrees NORTH of EAST.
B. 20.3 kg m/s at an angle of 24.6 degrees SOUTH of EAST.
C. 26.1 kg m/s at an angle of 24.6 degrees NORTH of EAST.
D. 26.1 kg m/s at an angle of 89.7 degrees SOUTH of EAST.
E. 43.00 kg m/s at an angle of 45.0 degrees NORTH of EAST.
A. 20.3 kg m/s at an angle of 89.7 degrees NORTH of EAST.
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A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet. The ammeter shows a deflection when:
a. the wire is moved parallel to the field. b. neither wire nor magnet is moving. c. the wire's axis is parallel to the field. d. the wire is moved perpendicularly to the field.
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
A. (?3, ?1) m B. (+1, +3) m C. (+3, ?1) m D. (?1, ?3) m E. (?0.5, ?2) m
Two infinite parallel surfaces carry uniform charge densities of 0.20 nC/m2 and ?0.60 nC/m2. What is the magnitude of the electric field at a point between the two surfaces?
A. 34 N/C B. 23 N/C C. 45 N/C D. 17 N/C E. 90 N/C
Assume that a heavy rope is tied to a light rope. Imagine a transverse wave that propagates from the light rope onto the heavy rope. For this wave, which of the following will occur?
(i) The frequency will decrease. (ii) The frequency will increase. (iii) The wave speed will increase. (iv) The wave speed will decrease.
1.(iii) only. 2.(ii) and (iii) only. 3.(i) and (iv). 4.(iv) only.