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A copper pipe with an outer radius of 0.014 m runs from an outdoor wall faucet into the interior of a house. The temperature of the faucet is 3.8° C and the temperature of the pipe, at 3.3 m from the faucet, is 26° C. In seventeen minutes, the pipe conducts a total of 257 J of heat to the outdoor faucet from the house interior. Find the inner radius of the pipe. Ignore any water inside the pipe.f
A 57.3-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.770 and 0.405, What horizontal pushing force is required to just start the crate moving
In an experiment of centripetal force you have a rotating mass of 500 grams, which is at 5 cm from the axis of rotation. Calculate the angular velocity of the rotating mass
The electric field on the x-axis due to a point charge fixed at the origin is given by E=(b/x^2)i, Find the magnitude and sign of the point charge
A 40kg child on a 2.30 m long swing is released from rest when the swing supports make an angle of 26 degrees with the vertical. The acceleration of gravity is 9.8 m/s2.
As in the previous problem (43), a solid block is suspended from a spring scale. If the reading on the scale when the block is completely immersed in water is 25.0 N, what are the block's volume and density
A man stands on a platform that is rotating (without friction) with an angular speed of 0.361 rev/s; his arms are outstretched, what is the resulting angular speed of the platform
When a 4.0 µF capacitor is connected to a generator whose rms output is 34 V, the current in the circuit is observed to be 0.40 A
If it actually hits the ground with a speed of 7.80 m/s, what is the magnitude of the average force of air resistance exerted on it
Two frictionless carts are pulled (horizontally to the left) by a force of F1=24N. m1=2.0kg and m2=4.0kg, find the tension in the connecting cord
You exert a force of 25 N on the head of a thumbtack. What is the pressure on your thumb
A laser beam is incident at an angle of 30.8° to the vertical onto a solution of corn syrup in water. If the beam is refracted to 19.18° to the vertical, what is the index of refraction of the syrup solution
an object of mass m=3.1g and charge q=+48 is attached to a string, find the magnitude of the electric field and the tension in the string
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