A geologist suspends a 0.30-kg stone on an ideal spring. In equilibrium the stone stretches the spring 2.0 cm downward
The stone is then pulled an additional distance of 1.0 cm down and released from rest.
(a) Write down the equation for the vertical position y of the stone as a function of time t, using the cosine function. Take the origin at the equilibrium point of the stone, with the positive y direction upward.
(b) How fast is the stone moving at a time equal to 1/3 of its period of motion?
(a) y = -(0.010 m) cos(22 s-1 t) (b) 0.19 m/s
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The electric potential at the surface of a charged conductor
a. is always zero. b. is always independent of the magnitude of the charge on the surface. c. may be set equal to zero by adding an appropriate constant to the potential at all points of space. d. is always such that the potential is zero at all points inside the conductor. e. is always such that the potential is always zero within a hollow space inside the conductor.
An electrical motor spins at a constant 2857.0 rev/min. If the armature radius is 2.685 cm, what is the acceleration of the outer edge of the armature?
A) 2403 m/s2 B) 844.4 m/s2 C) 241,100 m/s2 D) 84.40 m/s2
Find the net work done by friction on a box that moves in a complete circle of radius 1.82m on a uniform horizontal floor. The coefficient of kinetic friction between the floor and the box is 0.25, and the box weighs 65.0N
A) 1800 J B) 370 J C) 0 J D) 190 J
Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum constructive interference is to occur at point P, the two beams must travel paths that differ by
A) an odd number of half-wavelengths. B) a whole number of half-wavelengths. C) a whole number of wavelengths.