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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 2.2m from the axis has a tangential speed of 1.4 m/s. What is the tangential speed of another child, who is located at a distance of 3.3m from the axis, in m/s?
q1. a spaceship of mass 2.50806 kg is to be accelerated to a speed of 0.820c.a what minimum amount of energy does this
General relativity says that the total orbital energy of the binary system consisting of two neutron stars will decrease over time through the emission of gravitational waves. If this happens slowly sufficient that the orbit stays circular, response ..
An object with a height of 4.0 cm is placed 30.0 cm from a lens. The resulting inverted image has a height of 1.5 cm. What is the focal length of the lens
A cannon fires a cannon ball at 999.16 m/s in a straight line that passes directly over an observer's head. how far is the cannon from the observer
An electron and a proton are each placed at rest in a uniform electric field of magnitude 556 N/C. Calculate the speed of each particle 47.6 ns after being released
A 20 g plastic ball is moving to the left at 35 m/s. How much work must be done on the ball to cause it to move to the right at 35 m/s
The drawing shows an intravenous feeding. With the distance shown, nutrient solution (? = 1010 kg/m3) can just barely enter the blood in the vein. What is the gauge pressure of the venous blood
Two people pull as hard as they can on horizontal ropes attached to a boat that has a mass of 200 kg. If they pull in the same direction, the boat has an acceleration of 1.59 m/s2 to the right. If they pull in opposite directions, the boat has..
What magnitude point charge creates a 14000 N/C electric field at a distance of 0.230 m, How large is the field at 20.0 m
The electric potential at the center of a (5.00 cm radius) metallic sphere is zero volts. what is the voltage between the conductors
A coil of 15 turns and radius 10.0 cm surrounds a long solenoid of radius 2.00 cm and 1000 turns/meter. The current in the solenoid changes as I = (5.00 A) sin(120t). Find the induced emf in the 15-turn coil as a function of time.
A banked circular highway curve is designed for traffic moving at 77-km/h. The radius of the curve is 153 m. Traffic is moving along the highway at 46-km/h on a rainy day. What is the minimum coefficient of friction between tires and road that wil..
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