A ball of mass 5.0 kg is suspended by two wires from a horizontal arm that is attached to a vertical shaft, as shown in the figure
The shaft is in uniform rotation about its axis. The rate of rotation is adjusted until the tensions in the two wires are EQUAL. At that speed, the radial acceleration of the ball is closest to
A) 4.9 m/s2.
B) 5.9 m/s2.
C) 6.9 m/s2.
D) 7.9 m/s2.
E) 9.9 m/s2.
Answer: A
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The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center. b. the Copernican system used elliptical planetary orbits c. the Copernican system used uniform circular motion. d. the Copernican system assumed all planets orbited the Sun
The lowest energy level in an atom is its
a. ionization level. b. emission level. c. absorption level. d. photon level. e. ground state.
__________________ is the agitation among the molecules and/or atoms of a body
Fill in the blank(s) with correct word
A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2. At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time.
What will be an ideal response?