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During a lightning storm, it is safest to stand in the middle of a field, rather than taking shelter under a tree. Many deaths caused by lightning relate to this. Why is this the case?
How can an electric current cause a magnetic field? Describe how some common device that uses this principle to accomplish something useful.
Using general terms, explain how a DC motor works?
How does a transformer work? What does it do to an electrical current?
A student reading his physics book on a lake dock notices that the distance between two incoming waves is about 0.85m, and then measures the time of arrival between the crests to be 1.7s. What is the approximate speed of the waves?
The 0.4kg slender bar and 1 kg disk released from rest in the position shown. if the disk roll, what is the bar's angular acceleration at the instant of release?
a 1.8 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction is applied on the block. what is the work done by the force between the initial position and x = 2.0 m
A golfer tees off on level ground, giving the ball an initial speed of 38.5 m/s and an initial direction of 36.0° above the horizontal. (a) How far from the golfer does the ball land? (Neglect air resistance.)
A straight wire having a length of 14.0 m is bent to form a square. If the wire carries a current of 20.0 A, what is the magnitude of the magnetic field at the center of the square
One of the fastest recorded pitches in major-league baseball, thrown by Tim Lincecum in 2009, how far would the ball fall vertically by the time it reached home plate, 60.5 ft away
Determine the WAVELENGTH of the wave. Remember, the speed of light is 3×108 m/s.
Astronomers discover an exoplanet (a planet of a star other than the Sun) that has an orbital period of 3.53 Earth years in its circular orbit around its sun, Find the radius of the exoplanet\'s orbit
the crew of an enemy space craft attempts to escape from your spacecraft by moving away from you at 0.281 of the speed
A spaceship is 1600 m long when it is at rest. When it is traveling at a certain constant speed its length is measured by external observers and it is found to be 795 m. How much time does the roast beef spend in the oven
All the steps are quasi-static and reversible. Calculate the TOTAL work done by the gas.
A 4.00-kN piano is lifted by three workers at a constant speed to an apartment 27.6 meter above the street using a pulley system fastened to the roof of the building. determine the time required to lift the piano from the street to the apartment
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