If an element of atomic number 15 has an isotope of mass number 32
A) the number of neutrons in the nucleus is 15.
B) the number of neutrons in the nucleus is 17.
C) the number of protons in the nucleus is 17.
D) the number of nucleons in the nucleus is 15.
E) the number of protons in the nucleus is 32.
B
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A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
A. 3.5 rad/s B. 3.8 rad/s C. 4.1 rad/s D. 2.0 rad/s E. 5.6 rad/s
Vector = 4.00 m points eastward and vector = 3.00 m points southward. The resultant vector + is given by
A) 5.00 m at an angle 36.9° south of east. B) 5.00 m at an angle 53.1° south of east. C) 5.00 m at an angle 71.6° south of east. D) 5.00 m at an angle 18.4° south of east. E) 5.00 m at an angle 26.6° south of east.
If an ideal gas does positive work on its surroundings, we may assume, with regard to the gas, that its:
a. temperature increases. c. pressure increases. b. volume increases. d. internal energy decreases.
A hydraulic jack is used to lift a load of weight 4000 N. The load-bearing cylinder has a radius of 4 cm, and the other piston has a radius of 1 cm. What force must be exerted on the smaller piston to support the load?
A. 100 N B. 16,000 N C. 250 N D. 1000 N E. 4000 N