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A pipe 0.026 m in diameter and 0.22 m long can transfer 3476 J of heat per second with a temperature difference across the ends of 7?C. Compare this performance with the heat transfer of a solid silver bar of the same di- mensions by finding the ratio of the given heat to that of the silver bar. The thermal conduc- tivity of silver is 427 W/m · ? C. (Silver is the best heat conductor of all metals.)
A horizontal force of 213 N is exerted on a 1.90 kg discus as it rotates uniformly in a horizontal circle (at arm's length) of radius 1.60 m. determine the time for one revolution of the discus. Round the answer to 2 decimal places.
A car with mass 2000.0kg is moving from rest with acceleration 0.50m/s^2. What is its speed after 4.0s of motion? What is its kinetic energy at that instant of time
In Oersted's experiment, suppose that the compass was 0.27 m from the current-carrying wire. If a magnetic field of 1/4 the Earth's magnetic field of 5*10-5 T was required to give a noticeable deflection of the compass needle, what current must the w..
A classroom demonstration is done with an Atwood machine. The masses are m1 = 1.0 kg and m2 = 1.10 kg. what is the acceleration of gravity at that place
Three resistors having resistances of R1 = 1.53?, R2 = 2.37?, and R3 = 4.73?respectively, are connected in parallel to a 28.3 V battery that has negligible internal resistance. Find the equivalent resistance of the combination
You would like to shoot an orange out of a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. how far away can you stand to hit the orange
A 10000 kg empty railroad car moving at 3 m/s collides with a loaded railroad car weighing 196000 N and couples with it. What is the final velocity of the combined railroad cars
The wheel of an automobile has a mass of 25 kg and a diameter of 67.0 cm. What is the angular momentum of the wheel about its axle when the automobile is traveling at 25 m/s (90 km/h) on a straight road
A 1.5-cm--tall object is 28cm to the left of a lens with a focal length of 14cm. Calculate the distance between the image and the second lens
A person walked a 400 m with a constant speed of 1 m/s, then he increased his speed and walked another 400 m with 2 m/s, what is the average speed during his trip
Suppose you wish to make a solenoid whose self-inductance is 1.6 mH. How many turns of wire are needed
A thin spherical shell has a radius of 2.1 m and a mass of 360 kg, and its center is located at the origin of a coordinate system. What is the gravitational force of attraction between the two shells
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