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Question: Suppose equal weights are put on the two pans of a beam balance, the arm is kept at an angle with the horizontal and released. Is the torque of the two weights about the middle point (point of support) zero? If so, why does the arm rotate and finally become horizontal?
A suspension bridge is 62.0 m above the level base of a gorge. A stone is thrown or dropped from the bridge. If you throw the stone straight down with a speed of 25.0 m/s, how long before it hits the ground
A whale comes to the surface to breathe and then dives at an angle of 20 degree below the horizontal.
A space station, in the form of a wheel 184 m in diameter, rotates to provide an "artificial gravity" of 7.40 m/s2 for persons who walk around on the outer rim. Find the rotational frequency of wheel (in revolutions per minute) that will produce t..
A train normally travels at a uniform speed of 72 km/h on a long stretch of straight, level track. how much time is lost in stopping at the station
If material increases its length by 4.2% when its temperature is raised 40 degrees C, then what is its coefficient of linear expansion
A couple is defined as two parallel forces, separated by a distance, that have equal magnitudes but opposite directions. A couple only produces a rotation in a specified direction. The moment produced by a couple is known as a couple moment.
you want to take a picture of a 4.5 m tall giraffe at the zoo. your camera has a focal length of 50 mm and the size of
A cylindrical bucket, open at the top, is 28.0 cm high and 10.0 cm in diameter. How high will the water rise in the bucket
Vectors A and B have scalar product -7.00 and their vector product has magnitude 7.00. What is the angle between these 2 vectors
Earth has a net charge that produces an electric field of approximately 150 N/C downward at its surface. Find the magnitude of the excess charge on the earth
A bicycle has wheels with a diameter (DIAMETER, not radius) of 0.580 m. Find the linear acceleration of the bicycle
A rifle is aimed horizontally at a target 50 meter away the bullet hits the target 1.5 centimeter below the aim point, Find the bullet speed as it left the barrel
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