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If a engine does 200 J of net work and exhausts 800 J of heat per cycle, what is its the thermal efficiency?
An aluminum wing on a passenger jet is 40 m long when its temperature is 22°C. At what temperature would the wing be 7 cm (0.07 m) shorter
Find the energy of the electron in the ground state oftriply ionized beryllium, which has an atomic number Z =4. Find the radius of its ground-state orbit
in ordinary laboratory circuits charges in the mu rm c and rm nc range are common. part a how many excess electrons
To make ice, a freezer that is a reverse Carnot engine extracts 50 kJ as heat at -15°C during each cycle, How much work per cycle is required to run the freezer
The amplitude of a periodic wave is described by theequation Ao cos4 (kx - wt). find the Fourier spectrum of this wave
a particle starts from the origin at t 0 with an initial velocity of 4.0 ms along the positive x axis. if the
An airplane propeller is 3.08 in length (from tip to tip) and has a mass of 142. What is the propeller's angular speed after making 5.00
Three successive resonance frequencies in an organ pipe are 1470, 2058, and 2646 Hz. What is the length of the pipe
A mass of 50 kg is suspended from a steel wire of diameter 1.0 mmand length 11.2 m. How much will the wire stretch
A sphere of radius 4.16cm and uniform surface charge density +11.2 µC/m2 exerts an electrostatic force of magnitude 4.52 x 10-2 N on a point charge +1.30 µC. Find the separation between the point charge and the center of the sphere
Rachel is on the roof of a building, h=15 memters above ground. She throws a heavy ball into the air with a speed v=2.6m/s at an angle 62 degree with respect to the horizontal. Find the speed of the ball when it hits the ground
the average person passes out at an acceleration of 7g that is seven times the gravitational acceleration on earth.
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