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A merry-go-round at a playground is a circular platform that is mounted parallel to the ground and can rotate about an axis that is perpendicular to the platform at its center. The angular speed of the merry-go-round is constant, and a child at a distance of 1.4 m from the axis has a tangential speed of 2.2 m/s. What is the tangential speed of another child, who is located at a distance of 2.1 m from the axis?
A new event has been proposed for the Winter Olympics. An athlete will sprint 100 m, starting from rest, then leap onto a 18 kg bobsled. How far will Lisa compress the spring
One vessel contains a mixture of 5 parts pure wine and 3 parts soda, whereas the other vessel contains a mixture of 9 parts pure wine and 5 parts soda. Compare the strength of the wine.
Light hits the surface of water at an incident angle of 36° with respect to the normal line. What is the angle between the reflected ray and the refracted ray?
Explain how does that compare with the heat needed to reaise the temp of the same mass of water through the same temp difference?
Four polarizing sheets are placed one behind the other, each onemaking an angle of 20o with the preceding one. A polarized beam of light with itselectric field making an angle of 30o with the first polarizing sheet impinges on this assembly.
An airplane black box contains a bunch of unknown resistances and sources of emfs connected in unknown way such that (1) a 9 Ohm resistor across the terminals of the circuit box draws 0.80 A, and (2) an 17 Ohm resistor draws 0.50 A. What resistance w..
In the 1950s, an experimental train that had a mass of 2.30 x 10^4 kg was powered across a level track by a jet engine that produced the thrust of 5.30 x 10^5 N for a distance of 504 m. unless otherwise directed, suppose that air resistance is neglig..
If the perceived frequency becomes constant at 440 Hz, what is terminal speed at the paratrooper? Take the speed sound in air to be 343 m/s and assume the paratrooper always remains below the helicopter.
Large meteors can impact the earth with speeds of 80,000 km/h. If such a meteor were to impact at a point on the plane of Earth's equator, calculate the mass of the meteor
Cloverleaf exits are approximately circular. A 740 kg automobile is traveling 60 mph while taking a cloverleaf exit that has aradius of 44.5 m. Calculate the centripetal acceleration of the car and the centripetal force on the car
A yo-yo is made from two uniform disks, each with mass m and radius R, connected by a light axle of radius b. Find the angular acceleration of the yo-yo
question a box sits on a horizontal wooden board. the coefficient of static friction between the box and the board is
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