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A UFO streaks across the sky at a speed of 0.80 c relative to the earth. A man on earth calculates the length of the UFO to be 250 meter along the direction of its motion. Find what length does the man measure for the UFO when it lands?
m
An airplane has a mass of 3.0*10^6 kg and air flows past the lower surface of the wing at 96 m/s, how fast must the air flow over top of the wing
A 1500 {rm kg} car skids to the halt on a wet road where mu_k = 0.50. How fast was the car travelling if it leaves 66-{rm m}-long skid marks.
Dave Johnson, the bronze medalist at the 1992 Olympic decathlon in Barcelona, How far does his center of mass move up as he makes the jump
A circular coil with one turn is in a perpendicular (timedependent) magnetic field given by B = 0.400 -0.0800 t Tesla, where time t is in seconds. Calculate the radius of the coil
A tiny sphere with a charge of q = +6.0 µC is attached to a spring. Two other tiny charged spheres, each with a charge of ?4.0-µC, are placed in the positions, in which b = 3.8 cm. The spring stretches 5.0 cm from its previous equilibrium position..
The electric field inside a 50.0?cm? long copper wire is 5.00mV/m .What is the potential difference between the ends of the wire
Suppose in the drawing that I1 =I2 = 23.6 A and that the separation between thewires is 0.0467 m. By applying an external magnetic field (createdby a source other than the wires) it is possible to cancel themutual repulsion of the wires. This exte..
An airplane is flying in a horizontal circle at a speed of 103 m/s. The 74.0 kg pilot does not want the centripetal acceleration to exceed 6.97 times free-fall acceleration. Find the minimum radius of the plane's path
24.0g of copper pellets are removed from a 300 ? C oven and immediately dropped into 120mL of water at 24.0 ? C in an insulated cup. What will the new water temperature be
In reality, the COP of the heat pump will only be 60 percent of the ideal value. What is the minimum power of the electric motor when the COP is 60 percent of the ideal value
q1. an alpha particle m 6.7 acute 10-27 kg q 3.2 acute 10-19 c has a speed of 20 kms at point a and moves to point b
How much does the spring stretch. A 1200 {rm kg} car traveling at a speed of 15 {rm m/s} skids to a halt on wet concrete where f_k = 0.20. how long are the skid marks.
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