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A spaceship passes you at a speed of 0.950c. You measure its length to be 50.2 m. How long would it be when at rest?
75-kg person stands on a 6.0-m-long 47-kg ladder. The ladder is tilted 60° above the horizontal. The coefficient of friction between the floor and the ladder is 0.42. The coefficient of friction between the wall and the ladder is zero.What dis..
At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. How long is each rod
A round pipe of varying diameter carries petroleum from a wellhead to a refinery. At the wellhead the pipe\'s diameter is 57.5 cm (0.575 m), what is the pipe\'s diameter at the refinery
A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a place perpendicular to the manetic field
A Carnot engine takes in heat from a reservoir at 470°C and releases heat to the lower-temperature reservoir at 200°C. What is its efficiency.
A man of mass 65 kg falls stiff-legged straight down from a height of 2m. He lands on one foot. The femur is a bone in the leg with the length L=.65m, and a cross-sectional area of about 2.0 x 10^-4m^2. The Young's modulus for bone is 9.4x 10^9 N/..
A sphere of radius r starts from rest and rolls without slipping along a curved surface, dropping through a vertical distance of 0.303 m. Find the final speed v of the sphere's center of mass
A spherical balloon has a radius of 6.75m and is filled with helium. The density of helium is 0.179 kg/m3, and the density of air is 1.29 kg/m3. Determine the largest mass of cargo the balloon can lift
Two point charges are located as shown in the figure, with charge q1 = +3.5 C at x = ?3.0 m, y = 0, How much work must be done on the electron to move it to the origin
A cockroach of mass m lies on the rim of a uniform disk of mass 4m that can rotate freely about its center like a merry-go-round. compute the angular velocity of the cockroach-disk system
A 50.0-kg child stands at the rim of a merry-go-round of radius 1.75 m, rotating with an angular speed of 3.10 rad/s. What is the child's centripetal acceleration
The tension in the string when the ball is at the very bottom of the circle is 4.3 N. At the very bottom of the circle, a very sharp knife is suddenly inserted, to cut the string directly below point of support. How far to the right of where the s..
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