A 2.0 kg mass is moving in a circular path with a radius of 5.00 cm. The mass starts from rest and with constant angular acceleration, obtains an angular velocity of 6.00 rad/sec in 3.00 sec. The mass then comes to a stop with constant angular deceleration in 4.00 sec. The centripetal component of acceleration of the mass at 5.00 sec after the start is
A. 2.50 
B. 2.03
C. 1.25
D. 0.980
E. 0.456
E. 0.456
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How can the description of the atom given by the Schrödinger equations be visualized?
a. As a sphere with electrons distributed through a solid positively charged core, like a plum pudding. b. As a miniature solar system. c. As a nucleus surrounded by an electron cloud. d. As a positively charged nucleus connected to a negatively charged electron shell by a spring. e. An empty box with just one atomic particle in it.
A 3.00-kg ball swings rapidly in a complete vertical circle of radius 2.00 m by a light string that is fixed at one end. The ball moves so fast that the string is always taut and perpendicular to the velocity of the ball
As the ball swings from its lowest point to its highest point A) the work done on it by gravity and the work done on it by the tension in the string are both equal to -118 J. B) the work done on it by gravity is -118 J and the work done on it by the tension in the string is +118 J. C) the work done on it by gravity is +118 J and the work done on it by the tension in the string is -118 J. D) the work done on it by gravity is -118 J and the work done on it by the tension in the string is zero. E) the work done on it by gravity and the work done on it by the tension in the string are both equal to zero.
What is the equivalent resistance between points a and b when R = 13 ??
A. 29 ? B. 23 ? C. 26 ? D. 20 ? E. 4.6 ?
Photosynthetic life existing on a planet farther from the Sun than the Earth would most likely be
A) smaller, less efficient at collecting solar radiation or have a faster metabolism than photosynthetic life on Earth B) identical to photosynthetic life on Earth C) larger, more efficient at collecting solar radiation or have a slower metabolism than photosynthetic life on Earth D) impossible