A student wants to place a flower pot on a board that juts out from a window so it will get more sunlight (Fig. 11-28). The flower pot has a mass of 3.9 kg and needs to be 65 cm from the window sill. The

Read More# Two small masses are attached to a massless rod of length 2.

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

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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

Read More# You heat a 507 cm3 sample of a substance from 133Â°C to 281Â

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,

Read More# A pendulum clock loses 25.80 s every day. What fractional ch

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

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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

Read More# A student wants to place a flower pot on a board that juts o

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%

Read More# A skater twirls at 1.0 rev/s with her arms extended and hold

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

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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.

Read More# A molecule of DNA (deoxyribonucleic acid) is 2.19 µm long.

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?

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