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The image of a tree 10 m high and 20 m away is 1.5 cm high when photographed. What is the focal length of the lens in the camera?
A very long solenoid with a circular cross section and radius r= 8.10 cm with n= 1.50E 4 turns/m has a magnetic energy density uB= 6.40 mJ/m3. What is the total energy stored in the solenoid
A 10 cm high object is situated 25 cm in front of a convex mirror that has a radius of curvature of 1.00 102 cm.
A skier with a mass of 63 kg starts from rest and skis down an icy slope that has a length of 50 m at an angle of 32 degrees with respect to the horizontal. Iillustrate what is the speed of the skier at the bottom of the slope?
In 1990 Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth, How much work did Arfeuille do on the object
The centers of a 14kg lead ball and a 110g lead ball are separated by 8.0cm. What gravitational force does each exert on the other
A bat flies toward a wall, emitting a constant sound of frequency 2.00 rm kHz. This bat hears its own sound plus the sound reflected by the wall.
At a construction site, a 62.0 kg bucket of concrete hangs from a light (but strong) cable that passes over a light friction-free pulley and is connected to an 84.0 kg box on a horizontal roof. Find the friction force on the box
an airplane starts from rest and accelerates at a constant 3.00 m/s^2 for 30.0 s before leaving the ground. how fast was the airplane going when it took off
Determine magnitude of the force from the ground on each front wheel. what is magnitude of the duck's velocity.
q1. a ferris wheel is a vertical circular amusement ride with radius 6 m. riders sit on seats that swivel to remain
A knife thrower throws a knife toward a 300-g target that is sliding in her direction at a speed of 2.50 m/s on a horizontal frictionless surface. find the speed of the knife after passing through the target
At one instant a bicyclist is 49.0 m due east of a park's flagpole, going due south with a speed of 14m/s. Then 35.0 s later, the cyclist is 49.0 m due north of the flagpole, going due east with a speed of 14m/s.
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