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The charge of 20μ C produces an electric field. Twopoints are 10 cm and 5cm from this charge. Find the amount of workdone in taking a proton from one point to another.
A person 1.7 m tall is standing 2.50m in front of a camera. Find the magnification and the height of the image on the film
While exploring a sunken boat the principal researcher found the absolute pressure on the exploring devide at the level of the boat about 413 atm the density of the seawater is 1025 kg/mcubed
An open train car, with a mass of 2130 kg, coasts along a horizontal track at the speed 2.41 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 2.59 s at the rate of 489 kg/s. What is the car\'s speed af..
A vertical tube that is closed at the upper end and open at the lower end contains an air pocket. The open end of the tube is under the water of a lake. What is the volume of the air pocket under these conditions
The combination of an applied force and a friction force produces a constant total torque of35.3N · m on a wheel rotating about a fixed axis. Find the magnitude of the torque due to friction
A soap film whose index of re%uFB02ecetion is 1.33 is suspended in air. When sunlight strikes the film nearly perpendicularly, two colors, Find the thickness of the film
A ruby laser emits an intense pulse of light that lasts a mere 30 ns. The light has a wavelength of 690 nm , and each pulse has an energy of 700 mJ. How many photons are emitted in each pulse
Two cylindrical artificial bones are made of the same material and length, one with twice the radius as the other. When the two have the same tension force applied, the larger bone stretches by what factor compared to the smaller bone?
The heels on a pair of women's shoes have radii of 0.54 cm at the bottom. find the stress on each heel
A potter's wheel is a uniform solid disk of diameter 0.72m and a mass of 60kg. what minimum total friction force must the potter supply to the disk if her hands are acting at the edge of the disk
The component of the external magnetic field along the central axis of a 18-turn coil of radius 28.0 cm decreases from 1.90 T to 0.550 T in 2.10 s. What is the direction of the current
A 180.0- g copper block at 90.0 oC is dropped into an aluminum calorimeter cup initially at 22.0 oC. What is the final temperature of the system
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