Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. Each dish in the figure concentrates sunlight on one side of a heat engine, producing a hot-reservoir temperature of 500 . The cold reservoir, ambient air, is approximately 30. The actual working efficiency of this device is 30%. What is the theoretical maximum efficiency?

What is the new flow rate : A viscous fluid is flowing in a constant cross-section, horizontal pipe. With a pressure difference across the pipe of 1 × 106 Pa, what is the new flow rate |

Explain what is its hydroxide-ion concentration : The pH of a 0.015 M ammonia solution is 10.72. What is its hydroxide-ion concentration |

What is the force the left support exerts on the beam : A gymnast with mass m1 = 43.0 kg is on a balance beam that sits on (but is not attached to) two supports. What is the force the left support exerts on the beam |

What are the amplitudes of each the two seperate modes : A room has two opposing walls which are tiled. The remainingwalls, floor, and ceiling are lined with sound-absorbent material. What are the amplitudes of each the two seperate modes |

Determine what is the theoretical maximum efficiency : Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. What is the theoreti.. |

Explain what is oxidation-reduction reaction : What is oxidation-reduction reaction. Balance the reaction between potassium permanganate with oxalic acid in the presence of excess sulfuric acid. What is normality. What is the normality of 1M H2SO4 solution. |

Evaluate the concentration of each substance : Calculate the concentration of each substance when mixing 40.0 mL of 0.1 M CH3COOH and 10.0 mL of 0.1 M CH3COONa |

Compute the magnitude of the force of friction : Suppose a slide similar to Der Stuka is 38.8 meters high, but is a straight slope, inclined at 45° with respect to the horizontal. Find the magnitude of the force of friction |

Compute what is the height of the final image : A converging lens with a focal length of 17.9 cm and a diverging lens are placed 26.0 cm apart, with the converging lens on the left. What is the height of the final image |

## Find the magnitude and direction of the fourth displacementWhile surveying a cave, a spelunker follows a passage 190{rm m} straight west, then 210{rm m} in a direction 45.0^circ east of south, and then 260{rm m} at 30.0^circ east of north. After a fourth unmeasured displacement, she finds herself back whe.. |

## Question1a cube of ice is taken from freezer at -83degc andquestion1a cube of ice is taken from freezer at -8.3degc and placed in a 100 g aluminium calorimeter filled with 289 g |

## Calculate the work you do on the pumpkinEarly one October you go to a pumpkin patch to select your Halloween pumpkin. Calculate the work you do on the pumpkin as you lift it from the ground |

## Describe the maxwell-amperes equationUse Maxwell-Ampère's equation to calculate the maximum strength of the B-field on the perimeter of the plates; when is the B-field maximum |

## Calculate the magnetic moment of the loopA current of 18.0 mA is maintained in a single circular loop of 2.20 m circumference. A magnetic field of 0.690 T is directed parallel to the plane of the loop. Calculate the magnetic moment of the loop. |

## Compute the magnitude of the force on the caran 1800 kg car is moving at 14 m/s slows to 8.0 m/s in 4.4 s. Use the impulse momentum theorem to find the magnitude of the force on the car |

## Find the initial speed of the rockA 0.20 {rm kg} rock is thrown vertically upward from the top of a cliff that is 31.0 {rm m} high. While it hits the ground at the base of the cliff, the rock has the speed of 31 {rm m/s}. Assume that air resistance can be ignored; find the initial sp.. |

## Find the value of g at the location of the pendulumA simple pendulum has a length of 52.5 cm and makes 83.0 complete oscillations in 2.00 min, Find the value of g at the location of the pendulum |

## When the small-mass object is the one moving initiallyOne object is at rest, and another is moving. The two collide in a one-dimensional, completely inelastic collision. when the small-mass object is the one moving initially |

## Determine what is the pressure at the lower level in paWater is moving with a speed of 4.7 m/s through a pipe with a cross-sectional area of 4.3 cm2. The water gradually descends 7 m as the pipe increases in area to 8.2 cm2. |

## How many atoms are in the copper blockA jogger runs 100m due east, then changes direction for the second leg of the run. At the end of the run, she is 350m away from the starting point at an angle of 25.0° north of east. What were the direction and length of her second displacement? Util.. |

## Assume that the electrons do not interact with one anotherA cubical box of widths Lx = Ly = Lz = L = 4.82 nm contains eight electrons. What is the energy of the ground state of this system? Assume that the electrons do not interact with one another, and do not neglect spin. |

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