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Suppose that the dipole moment associated with an iron atom of an iron bar is 2.4 x 10-23 J/T. Assume that all the atoms in the bar, which is 6.5 cm long and has a cross-sectional area of 1.1 cm2, have their dipole moments aligned. (a) What is the dipole moment of the bar? (b) What torque must be exerted to hold this magnet perpendicular to an external field of 1.4 T? (The density of iron is 7.9 g/cm3 and its molar mass is 55.9 g/mol.)
A wave pulse travels down a slinky. The mass of the slinky is m = 0.9 kg and is initially stretched to a length L = 7.3 m. What is the speed of the wave pulse
If 40 g of hot water at 80°C is poured into a cavity in a very large block of ice at 0°C, what will be the final temperature of the water in the cavity? Explain how much ice must melt in order to cool the hot water down to this temperature?
Sam heaves a shot with weight 16-lb straight upward, giving it a constant upward acceleration from rest of 45.7 m/s^2 for a height 65.0 cm. What is the speed of the shot when he releases it
A kite is hovering over the ground at the end of a straight 44-m line. The tension in the line has a magnitude of 15 N. Find the height of the kite
I have a cube of charge 1 cm on a side. The total charge is 1 coulomb. Using gauss's law, calculate the electric field due to the charge a kilometer away
You have a grindstone ( a disk) that is 84.0 kg, has a .307-mradius, and is turning at 104.0 rmp, How many turns wil the stone make before coming to rest
A motor running at 1500 revs/min has on its shaft three pulleys, of radii 6, 10 and 25 cm, respectively. Find the linear velocity of the outside rim of each pulley
A doubly charged ion is accelerated to an energy of 34.0 keV by the electric field between two parallel conducting plates separated by 2.00 cm
To clear the net, the ball must rise at least 0.294 m. If the ball just clears the net at the apex of its trajectory, explain how fast was the ball moving when it left the racquet?
When a person is given intravenous fluid, the bag containing the fluid is typically held about 0.8 m above the person's body. what is the pressure in the person's blood
Just by the impact, the clay has speed v0 = 9 m/s, and the disk is rotating clockwise with angular speed w0 = 0.4 rad/s. Just following the impact, what is an angular speed of the combined system of wheel plus clay.
A piano tuner stretches a steel piano wire with a tension of 964N. What is the frequency of its fundamental mode of vibration
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