A 0.40-kg mass, attached to the end of a 0.75-m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 450 N, then what maximum speed can the mass have if the string is not to break?
a. 370 m/s
b. 22 m/s
c. 19 m/s
d. 29 m/s
d
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An objects average density P is defined as the ratio of its mass to its volume. P = M/V. The earth's mass is 5.94 X 10^24 ks and its volume is 1.08 X 10^12 km^3. What is the earth's average density?
A. 5.50 X 10^3 Kg/M^3 B. 5.50 X 10^6 Kg/M^3 C. 5.50 X 10^9 Kg/M^3 D. 5.50 X 10^12 Kg/M^3
A jeweler needs to electroplate gold, having an atomic mass of 196.97 g/mol, onto a bracelet
He knows that the charge carriers in the ionic solution are singly-ionized gold ions, Au+, and has calculated that he must deposit of gold to reach the necessary thickness. How much current does he need to plate the bracelet in 3.0 hours? (e = 1.60 × 10-19 C, NA = 6.02 × 1023 atoms/mol) A) 9.1 mA B) 540 mA C) 33 A D) 1800 mA
A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south. The two cars stick together after the collision. What is the speed of the cars after collision?
A) 8.3 m/s B) 14 m/s C) 17 m/s D) 22 m/s
We can best understand how a diver is able to control his rate of rotation while in the air (and thus enter the water in a vertical position) by observing that while in the air
A) his linear momentum is constant. B) his potential energy is constant. C) his kinetic energy is constant. D) his angular momentum is constant. E) his total energy is constant.