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Q. A 10.0 g of Styrofoam carries a net charge of -0.700 uC and floats above the center of a large horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet.
Q. A Cessna aircraft has a lift off speed of 120 km/h. What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of 250 m?
The coefficient of kinetic friction between a 20 Kg box and the floor is 0.40. How much work does a pulling force do on the box in pulling it 8.0 m at the constant speed? The pulling force is directed 390 above the horizontal.
An electron moves in a circular path perpendicular to a constant magnetic field with a magnitude of 2.00 mT. The angular momentum of the electron about center of the circle is 5.50 multiplied by 10-25 J·s.
Assume a constant upward slope of 32; calculate the horizontal and vertical components of the acceleration of a truck that slowed from 140 to rest in 7.3.
Find out the magnitude of the friction force acting on the case. Laser light with a wavelength = 680 illuminates a pair of slits at normal incidence. What slit separation would produce first-order maxima at angles of 40 from the incident direction.
A 1.35 kg object is moving in the x direction at 16.4 m/s. Just 3.61 s later, it is moving at 28.8 m/s at 36.0^circ to the x axis. What is the magnitude of force applied throughout this time.
In one design, a large spring with spring constant 2×10^4 N/m was placed behind the cannon. The other end of the spring braced against a post that was firmly anchored to ship's frame.
The metal equilateral triangle in the figure, 20 {rm cm} on each side, is halfway into a 0.10 {rm T} magnetic field.What is the magnetic flux through triangle.
A particle undergoes a displacement Δr of magnitude 57 m in a direction 25° below the x axis. Express Δr in terms of the unit vectors x and y.
The critical angle for a special type of glass in air is 41.8. The index of refraction for water is 1.33. What is the critical angle if glass is immersed in water.
A map of a burned area obtined from remote sensing contains 120 pixels. The remote sensing image shows that the fire is isolated to 73 of 120 pixels.
An asteroid is discovered heading straight toward Earth at 14 km/s . An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10minutes , after which the asteroid is moving at 28degrees to its original pa..
An object is 22 cm in front of a diverging lens that has a focal length of -13 cm. How long in front of the lens should the object be placed so that size of its image is reduced by a factor of 4.
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