A solid disk is released from rest and rolls without slipping down an inclined plane that makes an angle of 25.0° with the horizontal. What is the speed of the disk after it has rolled 3.00 m, measured along the plane?
A)
2.04 m/s
B)
3.53 m/s
C)
4.07 m/s
D)
5.71 m/s
E)
6.29 m/s
C
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Work is done on an object to increase its total energy. Which one of the following is true?
A. Both the kinetic energy and potential energy can be larger B. The total work done must be equal to the energy lost to heat and sound C. If the potential energy increases, then the kinetic energy must decrease D. The object must have a larger speed and smaller height above the ground
Understanding wind movement is increasingly important as wind power becomes more common. Wind turbines are driven by air and create electricity, so faster air means more power. Air close to Earth's surface doesn't move as quickly because it is slowed by friction with Earth's surface. Wind turbines are tall in order to access the faster-moving air above Earth's surface. Which of the following options describe the features of the ideal location to erect wind turbines in order to generate the most electricity? Select the two that apply.
A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stop watch measures the ball's trajectory time from table to the floor to be 0.20 s. How far away from the table does the ball land? (g = 9.8 m/s2 and air resistance is negligible)
a. 0.24 m b. 0.048 m c. 0.39 m d. 0.15 m e. 0.47 m
In a single-slit diffraction experiment, the width of the slit through which light passes is reduced. What happens to the width of the central bright fringe?
A) It becomes narrower. B) It stays the same. C) Its behavior depends on the wavelength of the light. D) It becomes wider.