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The 9-kg cradle is supported as shown by two uniform disks that roll without sliding at all surfaces of contact. The mass of each disk is m = 6 kg and the radius of each disk is r =- 80 mm. Knowing that the system is initially at rest, determine the velocity of the cradle after it has moved 250 mm.
A car has a 12 W reading lamp in the ceiling. This lamp operates with a potential difference of 12 V across it. Determine how much current flows through the lamp
In the lab frame, a point charge of +q is at rest between two streams of positive charge moving at c/3. The charge per unit length in the line of moving charges is ?C/m. In the lab frame, the electrostatic forces on charge q add up to zero, and th..
Passengers riding on a ferris wheel feel three times heavier at the bottom most point of the ride as they do at the top most point. The radius of the wheel is 19.62m, how many revolutions does the wheel make in one minute?
A common flashlight bulb is rated at 0.30 A and2.8V (the values of the current and voltage under operating conditions). what is the temperature of the filament when the bulb is on
An open-pit coal mine consumes 96 hectares of land, down to the depth of 26 m, each year. What volume of earth, in cubic kilometres, is removed in this time.
1)Suppose that you start with 2.52×1018 radioactive nuclei and 2.09 h later determine that only 8.14E17 nuclei of the substance remains. What is the half-life of this substance?
It is well established that your company's current hiking shoe design lasts on average 900 miles. It is also well known that the durability of hiking shoes is normally distributed. By adding a new ingredient to the soles, you believe you can extend t..
A window air conditioner unit absorbs 9.85 104 J of heat per minute from the room being cooled and in the same time period deposits 1.47 105 J of heat into the outside air. What is the energy efficiency rating of the unit
it has been suggested that rotating cylinders about 12 mi long and 4.6 mi in diameter be placed in space and used as
A 1.50 grinding wheel is in the form of a solid cylinder of radius 0.140. Use equation to calculate the work done by the torque
Consider yourself at the Earth's equator, looking up at the night sky. As you watch the stars, in what direction do they appear to be moving? Find the distance in parsecs to the star Altair, which has an annual parallax of 0.20 arcsec.
A rock is tossed straight up with a velocity of 40.0 m/s.When it returns, it falls into a hole 11.5 m deep. What is the rock's velocity as it hits the bottom of the hole?
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