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A 102 kilogram fireman slides down a pole to the ground floor, 3.3 meter below. The fireman starts at rest and lands with a speed of 4.2m/s. Need to determine the average force exerted on the fireman by the pole? If the landing speed is half that in the first answer is the average force exerted on the fireman by the pole doubled? Why? And find the average force exerted on the fireman by the pole when the landing speed is 2.1 m/s.
The mass of the blue (dark) puck in the figure below is 18.3% greater than the mass of the green (light) one. Calculate the speed of the blue puck after the collision
an airplane is flying at a speed of 200ms in level flight at an altitiude of 800 m . a package is to be dropped from
A diffraction pattern forms when light passes during a single slit. The wavelength of the light is 686 nm. Decide the angle that locates the first dark fringe when the width of the slit is (a) 1.7 x 10-4 m and (b) 1.7 x 10-6 m.
A glass fiber of index 1.50 is used to transmit light but is submerged in water of index 1.33. What is the critical angle for light to stay inside the optical fiber
a bird lands on a bare copper wire carrying a current of 33 a. the wire is 8 gauge which means that its cross-sectional
The range of a projectile depends not only on v0 and ?0 but also on the value g of the free-fall acceleration, which varies from place to place. by how much would his record have differed
A typical cost for electric power is 12.0 cents/ per kilowatt-hour. What is the yearly cost of operating your refrigerator
a converging lens forms an image of an 8.00-rnm-tall real object. the image is 12.0cm to the left of the lens 3.40cm
For a mass spectrometer the magnetic field is varied to allow ions of varying mass to reach the detector. A different method would be to maintain a constant magnetic field and vary the accelerating potential difference of V.
A person pushes a 12.3-kg shopping cart at a constant velocity for a distance of 16.5 m on a flat horizontal surface. calculate the work done by the pushing force
a 12 kg object sits on 4 rubber pads. Each pad is 35 mm in diameter and 12 mm thick. how far sideways did the object move while the force was applied
One component of a magnetic field has a magnitude of 0.040 T and points along the +x axis, while the other component has a magnitude of 0.030 T, What is the angle that the net force makes with respect to the +x axis
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