A 375-g stone hangs from a thin light string that is wrapped around the circumference of a frictionless pulley with a moment of inertia of 0.0125 kg ? m2 and a radius of 26 cm
When the stone is released, the stone accelerates downward and the pulley rotates about its axis as the string unwinds.
(a) What is the magnitude of the acceleration of the stone?
(b) What is the tension in the string?
(a) 6.6 m/s2 (b) 1.2 N
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A man pushes a block up an incline at a constant speed. As the block moves up the incline,
(a) its kinetic energy and potential energy both increase. (b) its kinetic energy increases and its potential energy remains the same. (c) its potential energy increases and its kinetic energy remains the same. (d) its potential energy increases and its kinetic energy decreases by the same amount.
__________is the stage in the early history of the Universe when ultraviolet photons from the first stars ionized the gas filling space
A) Unionization B) Replication C) Recombination D) Reionization
A 2000 kg car is traveling on a banked curved icy road. The velocity of the car is 25.0 m/s and the road has a radius of curvature of 500 m. If the car is to travel on the icy road without sliding, then the angle of the banked road is
A. 25.7 degrees. B. 21.0 degrees. C. 12.7 degrees. D. 10.5 degrees. E. 7.27 degrees.
Which of the following sets of characteristics describes the image formed by a plane mirror?
A) real and inverted B) real and upright C) virtual and upright D) virtual and inverted E) All of the previous statements can be correct.