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An isolated air-filled parallel-plate capacitor that is no longer connected to anything has been charged up to Q = 2.9 µC. The separation between the plates initially is 1.20 millimeter, and for this separation the capacitance is 31 pF. Compute the work that must be done to pull the plates apart until their separation becomes 5.30 millimeter, if the charge on the plates remains constant.
A microscope has an objective that has a focal length equal to 6.6 mm. what is the laternal magnification of the objective
The driver of a 1800 {rm kg} car travelling on a horizontal road at 100 {rm km}/{rm h} suddenly applies the brakes. Because of a slippery pavement, the friction of the road on the tires of the car, which is what slows down the car, is 20.0% of the..
A lead ball weighing 10 N falls 0.8 m from rest into a bucket of sand. The ball stops after making a crater 0.2 m deep. According to the work-energy theorem the work done by the sand on the ball in bringing it to rest is...?
A 28 cm tall object is placed in front of a concave mirror with a radius of 33 cm. The distance of the object to the mirror is 84 cm. Calculate the focal length of the mirror. Calculate the image distance. Calculate the magnification of the image ..
What is the work done by the centripetal force on an object with a mass of 2 kg moving with a constant velocity of 3 m/s into a circular path of radius 0.5 m for one full cycle?
A uniform electric field points midway between the positive x and y axies. Its strength is 100Volts/m. A -50nC charge is placed at the position ( 2m, 3m ) and fixed in place. What are the components of the total electric field at the location (..
consider two spheres with two masses and two charges. at a distance of 119.0 m the ratio of the electric force to the
When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, what is the speed of a particle (in km/s) on the star's equator
A particle has an acceleration of 6.19 m/s^2 for 0.350 s . At the end of this time the particle's velocity is 9.26 m/s What was the particle's initial velocity?
A 10 g bullet moving horizontally at 400m/s penetrates a 3.0 kgwooden block attached to a spring of spring constant 200N/m on a frictionless surface. How far is the spring compressed after the collision?
An 82 g arrow is fired from a bow whose string exerts an average force of 95N on the arrow over a distance of 77.00 cm. What is the speed of the arrow as it leaves bow.
A gas is flowing through a certain system. At the inlet, the pressure is 0.3 MPa and the density is 1.2kg/m^3. Determine the flow work the system does to the outside
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