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A camera is supplied with two interchangeable lenses, whose focal lengths are 40.0 and 120.0 mm. A woman whose height is 1.51 m stands 9.00 m in front of the camera. What is the height (including sign) of her image on the film, as produced by the 40.0-mm lens and the 120.0-mm lens?
A 30cm string of linear density 7.0 g/m is stretched to a tension of 35N and fixed at both ends, Calculate the wavelengths and frequencies of the first fourharmonics
An airplane with a speed of 120 km/h is headed 30.0º east of north in a wind blowing due west at 30.0º km/h. What is the speed of the plane relative to the ground
At t=0 a wheel rotating about a fixed axis at a constant angular acceleration has an angular velocity of 2 rad/s. what is the angular acceleration of this wheel
the phone lines to an airline reservation system are occupied 40 of the time. assume theevents that the lines are
assuming the average person has a mass of 68kg? Do not avoid the weight of the logs. Assume the specific gravity of wood is 0.6.
An electric utility company supplies a customer's house from the main power lines (120 V) with two copper wires, For this load current, find the power delivered to the customer
a softball is hit over a third basemans head with speed v0 and at an angle theta from the horizontal. immediately after
A 42-kg girl is standing on a 125-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is her velocity relative to the ice surface
1.two paths lead to the top of a big hill. one is steep and direct while the other is twice as long but less steep.
A charge of 80nC is uniformly distributed along the x axis from x = 0 to x = 2.0 m. Determine the magnitude of the electric field at a point on the x axis with x= 8.0m
A physicist is designing a cyclotron to accelerate protons toone tenth the speed of light. The magnet used will produce a fieldof 1.4 T. Calculate the radius of the cyclotron
the cable on an elevator of mass m snaps and two safety mechanisms come into play. emergency brakes apply a constant
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