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In 1656, the Burgmeister (mayor) of the town of Magdeburg, Germany, Otto Von Guericke, carried out a dramatic demonstration of the effect resulting from evacuating air from a container. It is the basis for this problem. Two steel hemispheres of radius 0.380 m (1.25 feet) with a rubber seal in between are placed together and air pumped out so that the pressure inside is 11.00 millibar. The atmospheric pressure outside is 970 millibar. Calculate the force required to pull the two hemispheres apart. Two equal teams of horses, are attached to the hemispheres to pull it apart. If each horse can pull with a force of 1390N (i.e., about 312 lbs), what is the minimum number of horses required? Also What would the units be for part 1 and part 2.
A circular coil having 19 turns and a radius of R = 19.2cm carries a current of 3.30A. It is placed in a uniform magnetic field of 62.0mT. What is the magnitude of the torque acting on the coil
You throw a rock vertically upward with an initial speed of 19.9 m/s. How much time does it take for the rock to hit the ground
You spin an object around so that it moves in a horizontal circle with 2.00 m radius at a speed of 2.5m/s, What is the angular speed of the object
Two charges q1 = 1.1 10-8 C and q2 = -4.8q1 are placed 50 cm apart. Find the point along the straight line passing by the two charges at which the electric field is zero, as measured from q1.
A truck is traveling at 13.1 m/s down a hill when the brakes on all four wheels lock. The hill makes an angle of 15 ° with respect to the horizontal. The coefficient of kinetic friction between the tires and the road is 0.815. How far does the ..
A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.877 rad/s. You, with a mass of 70.5 kg, compute the total angular momentum of the system
what is the initial velocity of a silver bullet if it completely melts when striking a werewolf? the initial temperature of the bullet is 300
An electron with kinestic energy 1.8 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 27.0 cm, Find the period of the motion
A 120g ball moving at .30 m/s in the + x-direction is subject to a 0.15N force in the - y-direction for 3.0s. Find the magnitude of the ball's momentum change
A 1200 kg car is traveling at 3.00 m/s and strikes a wall. The 1200 kg car bounces off the wall with a velocity of 4.00 m/s. then the average force on the car is
An airplane propeller is rotating at 1250rpm, Compute the propeller's angular velocity in rad/s
A 70 cm long, 0.8 mm diameter steel guitar string must be tightened to a tension of 2000 N by turning the tuning screws. By how much is the string stretched
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