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A rubber rod is rubbed with fur. The fur is then quickly brought near the bulb of an uncharged electroscope. What is the sign of the charge on the leaves of the electroscope?
a fully charged 12.0 volt car battery rated at 850 amp hours is connected to a spotlight rated at 150 watts for 12 volts. what current soed the spot operate on
A steel cable with a total length of 22.6 m and total mass of 68 kg is connected to two poles. Calculate the wavelength of the resulting wave on the cable
A police car is moving at 37.1 m/s (83.0 mi/h) behind a speeding car that is going faster. How fast is the speeder going
A window air conditioner has an average coefficient of performance of 2.3. In a futile attempt to cool a bedroom, Determine the net heat added to the room by operating the air conditioner in this manner
Some European trucks run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 110 π rad/s. What is the kinetic energy of the flywheel after charging
One object is at rest, and another is moving. The two collide in a one-dimensional, completely inelastic collision. when the small-mass object is the one moving initially
A freezer of resistance 14.5ohms is connected to a 110V source. What is the power delivered when this freezer is on
You use a sequence of ideal polarizing filters, each with its axis making the same angle with the axis of the previous filter, What is the angle between adjacent polarizers
A sailboat is heading directly north at a speed of 21 knots (1 knot = 0.514 m/s). The wind is blowing towards the east with a speed of 10.6 knots. (Both velocities are given relative to the Earth.)
If the sphere is enclosed in a room whose walls are kept at -5°C, what is the net flow rate of energy out of the sphere
What is the caused by sun wind in upper atmosphere
In order to find the density of an unknown material Susan measured the mass of a cube made out of this material and the length of its side
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