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A Carnot heat engine has water ice as a cold reservoir and has an efficiency of 70%. The cold reservoir then warms to 100 degrees Celsius. What would the efficiency be now if the hot reservoir stayed at the same temperature?
a small metal ball with a mass of 5.3 g and a charge of 6.3 mc is located at a distance of 0.70 m above the ground in
The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0^\circ above the horizontal, some of the tiny critters have reached a maximum height of 52.7cm above the level ground.
A small, 2.10 g plastic ball is suspended by a 20.0 cm long string in a uniform electric field E = 5.60×103 i N/C, If the ball is in equilibrium when the string makes a 15.0o angle with the vertical
a projectile is shot from the edge of a cliff 115m above the ground level with a inital speed of 65.0m/s at an angle of 35 degrees
An object is placed 20 cm to the left of a converging lens of focal length 27 cm. A diverging lens of focal length 10 cm is 25 cm to the right of the converging lens. Discover the position and magnification of the final image
An aluminum bar of mass 2.00kg at 300 C is thrown into a lake. The temperature of the water in the lake is 15.0 C; what is the change in total entropy Delta
Determine the reactance of a 7.00 μF capacitor at a frequency of 80.0 Hertz? Find what is the reactance of a 7.00 μF capacitor at a frequency of 3.70 MHz
A 34.3 kg child starting from rest slides down a water slidewith a vertical height of 20.7 m. What is the child's speed halfway down the slide's vertical distance?----m/s What is the child's speed three-quarters of the waydown?---m/s
What is social construction? Which example from the resources provided did you find most compelling in building your knowledge of social construction? Describe it and explain why you found it most useful.
The mass of a neutron is about 1.7x10?27 kg. Suppose the mass of a neutron star is about 3.4*10^30 kg. How many neutrons does such a star contain
The Bohr model of the hydrogen atom pictures the electron as a tiny particle moving in a circular orbit about a stationary proton. What is the angular velocity of the electron
When you take your 1400-{\rm kg} car out for a spin, you go around a corner of radius 52 m with a speed of 11 m/s. what is the force exerted on it by static friction
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