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1. What are the mechanisms of heat transfer? How are they distinguished from each other?
2. Two surfaces of a 2-cm-thick plate are maintained at 0°C and 80°C, respectively. If it is determined that heat is transferred through the plate at a rate of 500 W/m2, determine its thermal conductivity.
A car accelerates from 0 to 30 mph in 1.5s. How long does it take for it to accelerate from 0 to 60 mph, assuming the power of the engine is independent of velocity and neglecting friction?
An object is projected at 36.9 degrees above the horizontal. The potential energy of the object at the top of the trajectory is 144j. What is the kinetic energy at the top?
Telescopes can be networked together to give an apparent aperature equal to their separation. Telescopes on either side of Earth can be combined to give an aperature of 8000 miles, greatly improving resolving power. What is this technique called?
what is the voltage across the capacitors?
Evaluate the magnitude of the apparent weight of a 84 kg astronaut 4500 km from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 3.1 m/s^2?
If aliens were to drop an asteroid of a mass 10^14 kg from about the radius of the moon's orbit (384,000km), how much kinetic energy would it have
A uniform rod of mass 3.20×10?2 and length 0.430 rotates in a horizontal plane about a fixed axis through its center and perpendicular to the rod. find the angular speed of the rod after the rings leave it
If the velocity of a pitched ball has a magnitude of 35.0 m/s and the batted ball's velocity is 65.0 m/s in the opposite direction, Find the magnitude of the impulse applied to it by the bat
How much does the rocket clear the top of the wall
A cord passes over a weightless and frictionless pulley. Masses of 200 and 300 grams are attached to the ends of the cord. Find the distance the masses will move during the fifth second after they had started.
Say the electrical company needs to step down the voltage from 7200V RMS in the power line behind your house to the required 120V RMS, how many loops must be on the secondary side
consider an electron with an initial speed v0 = 32 Mm/s (1 Mm = 1 megameter = 1000 km = 1E6 m), What distance d (in m) will the electron travel before it stops
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