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A 5-cm-external-diameter, 10-m-long hot-water pipe at 80°C is losing heat to the surrounding air at 5°C by natural convection with a heat transfer coefficient of 25 W/m2 ?c °C. Determine the rate of heat loss from the pipe by natural convection, in kW.
A rocket cruising past earth at 0.800c shoots a bullet out the back door, opposite the rocket's motion, at 0.900c relative to the rocket. What is the bullet's speed relative to the earth
A block of mass 4.0 kg is attached to a string and the string is attached to a spring(k=32.0N/m). What is the maximum extension of the spring
A circular loop of wire of radius 18 cm moves at a speed of 6.6 m/s in the direction of a 0.13 T uniform magnetic field, What is the emf induced in the loop
A cyclist uses 27,000 joules per minute (this is about 385 food Calories per hour) to cycle at a constant pedaling rate of 450 radians per minute along a flat road using a gear ratio of 4
The graph shows the component of a force acting on an object, Find the work done by the force over the specified intervals of displacement
A pendulum is made with a 4.00 kg mass suspended at the end of a thin rod, What is the length of the thin rod
A 1.6mH inductor is connected in parallel with a variable capacitor. The capacitor can be varied from 100 pF to 200 pF. find the maximum oscillation frequency for this circuit
You find that if you hang a 1.75kg weight from a vertical spring, it stretches 2 90cm. What is the force constant of this spring in N/m
A spherical balloon has a radius of 12.5 m, and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 1200 kg? avoid the bouyant force on the cargo volume itself.
A hydrogen atom consists of a single proton and a single electron. Experimentally it is found that it takes 13.6eV of energy to strip the electron from the proton. calculate the size of the hydrogen atom
question you and your friend peter are putting new shingles on a roof pitched at 25circ . youre sitting on the very top
What is the total translational kinetic energy in a test chamber filled with nitrogen (N2) at 2.22×105 Pa and 20.7°C? The dimensions of the chamber are 1.00 m × 4.30 m × 6.50 m. The ATOMIC weight of nitrogen is 28.0 g/mol, Avogadro's number is 6.022 ..
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