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A photographer uses his camera, whose lens has a 70mm focal length, to focus on an object 4.5m away. He then wants to take a picture of an object that is 60cm away.
1. In which direction must the lens move to focus on this second object?
a) away from the film
b) towards the film
2. How far must the lens move to focus on this second object?
a ray of light traveling through the air has an angle of incidence of 30 degrees on a block of glass, find speed of light on the block of glass
A person pushes a 17.2-kg shopping cart at a constant velocity for a distance of 24.2 m on a flat horizontal surface. Determine the work done by the pushing force
A 1530 kg car is traveling with a speed of 14.5 m/s. What is the magnitude of the horizontal net force
A student has a stretched string on density u and length L under a tesnion F. A standing wave of frequency f = 4/4 squareroot, Calculate the length of the string
make use of the force equation of equilibrium with torques to compute around the second pivot pt, fine the women's position when the beam is about to tip.
Compute the force that acts on a square access hatch at the bottom of the tank that measures 0.25m by 0.25m.
How much time has elapsed between the two measurements.
An 88 kg spacewalking astronaut pushes off a 640kg satellite, exerting a 640N force for the 0.60 s it takes him to straighten his arms.
Closed gaussian surfuce in the shape of a cube of edge length 2.00 m, with one corner at x=5.00m, y=4.00m, what is the net charge contained by the cube
What friction torque is required to reduce its angular speed from 80.0 to 51 in 27.
What is the total charge of all the electrons in a 14 kg bar of zinc? (Zinc has 30 electrons per atom and an atomic mass of 65 u.)
What is the phase dierence between wavefronts originating from the two slits, at a point on the screen located +Π/10m from the zero'th order?
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