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## Category: physics # Two small masses are attached to a massless rod of length 2.

Posted By Bruce Simons

A skater twirls at 1.0 rev/s with her arms extended and holds a 3 kg mass in each hand; each mass is 0.8 m from the axis of rotation. She pulls the masses in along the radial direction until they are 0.4 m from the # The angular momentum of a flywheel having a rotational inert

Posted By Bruce Simons

A diver comes off a board with arms straight up and legs straight down, giving her a moment of inertia about her rotation axis of 18kg⋅m^2. She then tucks into a small ball, decreasing this moment of inertia to 3.6kg⋅m^2. While tucked, she makes two # You heat a 507 cm3 sample of a substance from 133Â°C to 281Â

Posted By Bruce Simons

A playground merry-go-round of diameter 3.5 m and rotational inertia 120 kg·m2 is pushed with no one on it by three children to an angular speed of 2.0 rad/s. Two of the children, of mass 29 kg each, jump on the edge of the merry-go-round, # A pendulum clock loses 25.80 s every day. What fractional ch

Posted By Bruce Simons

During a hurricane, wind with the speed of 160 mph blows over the roof of a house. The roof has a surface area of 225 m2 . Find the force acting on the roof. Show the derivation of your results. Use Bernoulli’s formula. (Take the # A flat horizontal square rocket launchpad is supported by a

Posted By Bruce Simons

The sound level of a certain sound is at 85 dB. This sound has a frequency of 1250 Hz.. It travels in a copper beam. The density of copper is 8.92 g/cm3 . Its elastic-modulus is 11×1010 Pascals . a) Find the speed of sound # A student wants to place a flower pot on a board that juts o

Posted By Bruce Simons

A certain star of radius 7.34 million meters, rotates 125 times around its axis in 240 hours. This star has a mass of 1.00×1032 kg. When this star collapses to a neutron star, its radius shrinks by a factor of 104 but it loses 30% # A skater twirls at 1.0 rev/s with her arms extended and hold

Posted By Bruce Simons

A copper wire of mass 25.6 g and length 3.56m is spanned between two clamps. A tension of 5000 N is applied to it. (a) Find the speed of a wave in the wire. (b)Assume the amplitude is 1.25 cm. Find the maximum acceleration of # Please take you time ensuring the answer is correct In the F

Posted By Bruce Simons

You heat a 507 cm3 sample of a substance from 133°C to 281°C and find that its volume increases by 2.29 cm3. Calculate the coefficient of volume expansion of this substance. # A molecule of DNA (deoxyribonucleic acid) is 2.19 µm long.

Posted By Bruce Simons

A pendulum clock loses 25.80 s every day. What fractional change ΔL/L must be made to the length L of the pendulum so that the clock keeps perfect time? # A single-loop circuit consists of a 7.2 Ω resistor, 11.8 H

Posted By Bruce Simons

A flat horizontal square rocket launchpad is supported by a large column at each corner. Each side of the square faces one of the cardinal directions, North, East, South, West. Each side is 15 meters in length. The launch pad is 75,000 kg in mass.