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An engine has an efficiency e1. The engine takes input heat QH from a hot reservoir and delivers work W1. The heat rejected by this engine is used as input heat for a second engine, which has an efficiency e2 and delivers work W2. The overall efficiency of this two-engine device is the total work delivered (W1 + W2) divided by the input heat QH. (a) Draw a energy-transfer diagram for this situation.
A 67 kg man weighs 637 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 19 percent of the body weight.
Consider a weathered rock or soil particle lying on a slope. How would the gravitational force pulling the particle downward along the land surface vary with the inclination of the slope.
assume the current in the coaxial cable, see the figure , is not uniformly distributed, but instead the current density varies linearly with distance from the center: for the inner conductor and for the outer conductor. Each conductor still carrie..
On a level road with its brakes on, a car traveling at 93km/hr stops within 92m when the brakes lock and the car slides.
A 0.200 kg block is placed on a vertical spring (k = 5.80x 10^3 N/m) and pushed downward, compressing the spring 0.100 m. As the block is released, it leaves the spring and continues to travel upward. What height above the point of release will bl..
how high above the target must the rifle barrel be pointed.
A plate of glass with parallel faces having a refractive index of 1.57 is resting on the surface of water in tank. A ray of light coming from above in air makes an angle of incidence 34.5 degrees with normal to the top surface of the glass.
A small glass bead has been charged to + 10nC. A metal ball bearing 1.90cm above the bead feels a 1.20×10-2 N downward electric force. What is the charge on ball bearing.
A discussion of why the ideal gas law is expected to fail at low temperatures and how its failure may affect your estimation of absolute zero.
A cannonball launched with an initial velocity of 161 m/s at the angle of 45 degrees follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is it going when it hits the balloon? What is the accelera..
A tennis player places a 40 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.052 kg tennis ball horizontally with a velocity of 30.6 m/s toward the north. What will be the final velocity of the machine.
An inflated rubber balloon is rubbed with the wool cloth until an excess of 1.50 multiplied by 109 electrons is on the balloon. What is the magnitude of the charge on the balloon.
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