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Q. A straight, stiff wire of length 1.00 m and mass 21 g is suspended in a magnetic field B = 0.58 T. The wire is connected to an emf. How much current must flow in the wire and in what direction so that the wire is suspended and the tension in the supporting wires is zero?
Q. A 185 watt motor is used to lift a 142 kg container to a height of 7 m. How much time does it take to lift the container with the motor?
When he reaches equator, the sphere is rotating at how many rpm. A car takes 9 s to go from v = 0 to v = 55 m/s at about constant acceleration.
Calculate torques about an axis
A small, 300 {rm g} cart is moving at 1.30 {rm m/s} on an air track when it collides with a larger, 3.00 {rm kg} cart at rest. After the collision, the small cart recoils at 0.890 {rm m/s}.
A pipe with a 2m diameter carries water having a velocity of 4 m/s. What is the mass flow rate of the water in kg/s at the following temperatures.
A 1.0 ball hangs from the ceiling of a truck by a 1.0--long string. The back of truck, where you are riding with the ball, has no windows and has been completely soundproofed. The truck travels along an exceedingly smooth test track, and you feel no ..
What is a vertical velocity of the ball
Assume someone drops an apple from a vertical distance of 6.0 meters, directly above the point where the arrow hits the tree.
What is the difference in blood pressure ({rm mm-Hg}) between the top of the head and bottom of the feet of a 1.80-{rm m}-tall person standing vertically.
A 11.0g bullet is fired horizontally into a 103g wooden block that is firstly at rest on a frictionless horizontal surface and connected to a spring of constant 154N/m. The bullet becomes embedded in block. If the bullet-block system compresses the s..
A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.6m/s at ground level. Its engines then fire and it accelerates upward at 3.80 m/s2 until it reaches an altitude of 930m. At that point its engines fai..
A string vibrates in five segments to a frequency of 460Hz. (a) what is its fundamental frequency? (b) What frequency will cause it to vibrate in three segments.
Two point charges, +3.09 µC and -6.05 µC, are separated by 1.33 m. What is the electric potential midway between them?
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