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Assuming the Earth's magnetic field averages about 0.50*10^-4 T near the surface of the Earth, estimation the total energy stored in this field in the first 6.5 km above the Earth's surface.
A constant retarding torque of 15 m·N stops a rolling wheel of diameter 0.50 m in a distance of 21 m. How much work is done by the torque
After 1.86 days, the activity of a sample of an unknown type radioactive material has decreased to 88.8% of the initial activity
A ten pound car wheel has a moment of inertia of 0.38 kg m2. What is the wheel's rotational kinetic energy
The Hall effect can be used to determine the density of mobile electrons in a conductor. Find the density of mobile electrons in the material
A baseball is thrown at an angle of 27 degrees relative to the ground at a speed of 20.9m/s. The ball is caught 36.0231m from the thrower. The acceleration due to gravity is 9.81m/s square. Explain how long is it in the air ?
An object is in front of a converging lens (f = 0.370 m). The magnification of the lens is m = 3.60. Through what distance should the object be moved
two parallel metal plates have area a255cm2 and are sepearated by l 0.50 cm. they have a potential difference of 0.25v.
A 40.0 m long uniform bridge span weighs 6.00 x 104N. What force do the bridge and the car exert on the left pier
One of the weapons considered for the "Star Wars" antimissile system is a laser that could destroy ballistic missiles. What laser beam intensity will produce such a field
The plane of a rectangular coil, 6.0 cm by9.0 cm, is perpendicular to the direction of a magnetic field vector B . If the coil has 100 turnsand a total resistance of 8.0 Ω, at what rate must the magnitude of vector B change to induce a current of0.10..
A fuzzy die that has weight of 1.8 N hangs from the ceiling of a car by a massless string. Find the angle theta
the density of helium gas at T=0 degrees Celcius is 0.179kg/m3. Temp is raised to 100 degrees Celcius, but pressure isconstant. calculate new density of gas
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