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Four equal charges of +2.5×10-6 C are placed on the corners of one face of a cube of edge length 15.0 cm. A charge of -2.5×10-6 C is placed at the center of the cube. What is the magnitude of the force on the charge at the center of the cube?
A dog running in an open field has components of velocity = 3.4 and = -1.9 at time = 10.4. For the time interval from = 10.9 to = 24.7, the average acceleration of the dog has magnitude 0.45 and direction 25.
A 770 kg car moving at 21 m/s brakes to a stop. The brakes contain about 15 kg of iron, which absorbs the energy. What is the increase in temperature of the brakes.
It collides with a 10,000 kg railway car resting at the bottom of the track with its brakes off. The two cars couple together and roll up the track to a height of h. find out h.
if the airplane somehow continues to fly as if nothing happend, where is the engine relative to airplane at the moment the engine hits the ground.
A contact lens is made of plastic with an index of refraction of 1.36. The lens has an outer radius of curvature of +1.91 cm and an inner radius of curvature of +2.41 cm. What is the focal length of lens?
What is modify in frequency ff - fi
A car is traveling 72.0 km/h when the driver applies the brakes. If if car slows down uniformly with an acceleration of -4.5 m/s2, how far does the car travel before coming to rest.
A train is travelling up a 3.2 degree incline at a speed of 3.25 m/s when the last car breaks free and begins to coast. How long does it take for the last car to come to rest.
A 2.80 kg gold bar at 98 degrees celcius is dropped into 0.34 kg of water at 23 degree celcius. what is the final temperature? assume the specific heatof gold is 129 J/kg
A yo-yo has a rotational inertia of 910 g·cm2 and a mass of 120 g. Its axle radius is 3.8 mm and its string is 100 cm long. The yo-yo is thrown so that its its initial speed down the string is 1.1 m/s.
You push with a 20N horizontal force on a 2 kg mass resting on the horizontal surface against a horizontal friction force of 12N. What is the acceleration.
A charge of -3.80 nC and a charge of -6.00 nC are separated by a distance of 60.0 cm. Find out the position at which a third charge of +7.30 nC could be placed so that the net electrostatic force on it is zero.
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