The position of a particle as it moves along the x axis is given by x = 15e?2t m, where t is in s. What is the acceleration of the particle at t = 1.0 s?
A. 22 m/s
B. 60 m/s
C. 8.1 m/s
D. 15 m/s
E. 35 m/s
Answer: C
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Which statement expresses Newton's first law of motion? a. An object with no force on acting on it continues at rest or moves in uniform motion in a straight line with constant velocity. b. An object with a force on it is accelerated in the direction of the force an amount inversely proportional to its mass and directly proportional to the size of the force. c. For every action, there is an
equal and opposite reaction. d. The force between two objects is directly proportional to the product of their masses and inversely proportional to the distance between them squared. e. The force between two objects is inversely proportional to the product of their masses and directly proportional to the distance between them squared.
Stable equilibrium is:
a. an equilibrium state where any small rotation results in a torque that acts to produce rotation back in the opposite direction. b. any form of equilibrium, because all equilibrium conditions are stable. c. an equilibrium state where nothing is moving. d. an equilibrium state where there is no net torque or net force. e. an equilibrium state where no torque is involved.
A vertical 30-cm steel rod, 1.0 cm in diameter, supports a 300-kg mass. What is the change in length of the rod caused by this mass? Young's modulus for steel is 2.0 × 1011 N/m2
A) 6.5 × 10-4 m B) 5.6 × 10-6 m C) 6.5 × 10-6 m D) 6.5 × 10-5 m E) 5.6 × 10-5 m
What was discovered in atomic spectra by physics pioneers Balmer, Rydberg, and Ritz?
A) unexplained randomness B) mathematical order C) all atoms are about the same size D) electrons occupy well-defined shells about the atomic nucleus E) electrons behave as standing waves