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A 0.48 m long guitar string, of cross-sectional area 1.0 10-6 m2, has Young's modulus Y = 1.90 109 N/m2. By how much must you stretch the string to obtain a tension of 30 N?
A vacuum cleaner is plugged into a 120.0-V socket and uses 4.1 A of current in normal operation, Find the coil resistance of the motor
A battery charger is connected to a dead battery and delivers a current of 3.7 A for 2.1 hours, How much energy is delivered to the battery
Assume a water strider has a roughly circular foot of radius 0.01 mm. What is the maximum possible upward force on the foot due to surface tension of the water
The near point of a naked eye is 25 cm. When placed at the near point and viewed by the naked eye, Find the focal length of the eyepiece
Use graphical techniques to find out the direction of the dog’s resultant displacement vector. Give the direction of the resultant displacement in degrees (out of 360).
A 42 kg child is riding on a carousel (merry-go-round) at a constant speed of 6 m/s. What is the magnitude of the change in the child's momentum |Δp with arrow| in going all the way around (360°)?
State Faraday's Law. If you use an equation define each term in the equation. what is the peak Emf induced in the coil
A satellite is in elliptical orbit with a period of 8.82 x 104 s about a planet of mass 6.80 x 1024 kg. The pericenter distance is 15900000 m. What is its angular speed at apocenter
A playground merry-go-round of radius R = 1.80 m has a moment of inertia I = 255 kg · m2 and is rotating at 9.0 rev/min about a frictionless vertical axle. What is the new angular speed of the merry-go-round
A positive point charge Q is on the y axis at y = D; a negative point charge -2Q is at the point x = D, y = D. Find the potential for points on the x axis
On a workday the average decibel level of a busy street is 84 dB, with 100 cars passing a given point every minute. what is the decibel level of the street
A 56.0 kg cheerleader uses an oil-filled hydraulic lift to hold four 120 kg football players at a height of 0.900m. what is the diameter of the football players' piston
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