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Lodestone (magnetite), an igneous rock formed from molten material, is a natural magnet. How could lodestones become magnetized? What is the principle of an electromagnet?
A tennis ball is struck and departs from the racket horizontally with a speed of 28.2 m/s. How far above the court is the tennis ball when it leaves the racket
A jet plane passes over you at a height of 4990 m and a speed of Mach 1.75. Find the Mach cone angle
To determine the center of mass of her body, a student lies on aplank of mass m=10 kg. The plank is supported by two scales at itsends. The distance between the scales is 2.5 meters. The left scalereads 339 N and the right reads 171 N.
What voltage will your voltmeter read across the second capacitor after repeating the charge sharing process three times? Express the answer with one decimal place
The three air carts shown in figure 9-16 have masses,reading fromleft to right, of 4m,2m,and m,respectively.The most massive carthas an initial speed of V0 ; the other twocarts are at rest initially.
a plane whose airspeed is 200km/h heads north. But a 100km/h northeast wind suddenly begins to blow. what is the excelerating velocity of the plane
Calculate the true mass (that it would have in the absence of air) of a piece of aluminum whose apparent mass is 2.0000 kg
A diathermy machine, used in physiotherapy, generates electromagnetic radiation that gives the effect of "deep heat" when absorbed in tissue. what is its wavelength
a 300 watt toaster is plugged into a 120 volt house current.Electricity is sold at 15 cents per kilowatt hour. If the toasteroperates for 2.5 minutes what is the cost of its operation
What value should m have so the masses won't accelerate? Now take μk = 0.15 on all surfaces and m = 1.1 kg . What will be the acceleration of both masses? Show the force diagram for each.
A circular loop of wire with a radius of 0.8 cm carries a current of 6 A. Determine the direction the loop will want to rotate.
Suppose a star the size of our Sun (R0 = 695,500 km) rotates at a speed of 1.0 revolution every 12 days. what would its new rotation speed be
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