A 1,200 kg car going 25 m/s is brought to stop using its brakes. Let's assume that a total of approximately 20 kg of iron in the brakes and wheels absorbs the heat produced by friction.

a) What was the car's original kinetic energy?

b) After the car has stopped, what is the change in temperature of the brakes and wheels.

Explain the addition of the substances : Calculate the of 0.280L of a 0.450M NaHSO3 - 0.285M Na2SO3 buffer before and after the addition of the following substances. |

Explain what was the wavelength of the second photon emitted : One of wavelength 434.2 nm to reach an intermediate level and a second to return to the ground state. What was the wavelength of the second photon emitted |

What is the amplitude of the pressure wave : Here in Boulder, normal atmospheric pressure is NOT 1 atm (that's down at sea level) Let's call it 0.850 atm on a given day. what is the amplitude of the pressure wave |

Explain the correct statement from the multiple choices : The normal sublimation point of solid acetylene is -84 C. Figure out the answers to the questions below and then pick the correct statement from the multiple choices(i) Is the sublimation of solid acetylene an endothermic or an exothermic process |

What was the cars original kinetic energy : A 1,200 kg car going 25 m/s is brought to stop using its brakes. Let's assume that a total of approximately 20 kg of iron in the brakes, What was the car's original kinetic energy |

Explain hooke''s law why the h-x stretches absorb : Explain using Hooke's law why the H-X stretches absorb higher frequency energy than C-X stretches. (X=C,N,O) |

Explain what is the kc : The dissociation of calcium carbonate has an equlibrium constant of kp=1.16 at 800 degrees c. CaCO3(s) CaO9s)+CO2(g). what is the kc |

Find the output voltage when the input voltage to the bridge : It is used in a quarter Wheatstone bridge with three other fixed 100 W resistors. If the strain gauge constant is 2.0, find the output voltage when the input voltage to the bridge is 10 Volts and the strain is 500 m strain. |

State the competing equilibrium that will occur : Write the competing equilibrium that will occur when a strong acid is added to the following equilibrium: Ca2+(aq) + C2O4 2-(aq) equlibrium CaC2O4(aq) |

## Find the second forceThere are two horizontal forces on the 2.0 kg box in the overhead view of the figure below but only one is shown. find the second force. |

## What will be the frequency of vibrationsA thin, uniformly charged spherical shell has a potential of 720 V on its surface. Outside sphere, at a radial distance of 29.0 cm from this surface, the potential is 434 V. |

## Calculate the temperature of the sourceA certain light source is found to emit radiation whose peak value has a frequency of 1.21×1015 Hz. Calculate the temperature of the source |

## Find the velocity of the second ball after the collisionA dolphin located in seawater at a temperature of 25 °C emits a sound directed toward the bottom of the ocean 200m below. How much time passes before it hears an echo. |

## What is the approximate length of the columnA column of soldiers, marching at 141 paces per minute, keep in step with the beat of a drummer at the head of the column, What is the approximate length of the column |

## What is the true distance between the pointsA 30-meter steel tape is correct at a temperature of 20.0(C). The distance between two points, as measured by this tape on a day when the temperature is 5 (C), is 25.970m. What is the true distance between the points? |

## Compute maximum displacement of the particleSoft drinks are commonly sold in aluminium containers. How a lot of such containers are thrown away or recycled each year by U.S. consumers. |

## Determine the self-inductance of one conductorA coiled telephone cord forms a spiral with 74.0 turns, Determine the self-inductance of one conductor in the unstretched cord |

## Where does he land on inclineA world class sprinter accelerates to his maximum speed in 3.80 s. He then maintains this speed for the remainder of a 100 m race, finishing with a total time of 10.30 s. What is the runner's average acceleration throughout the first 3.80 s. |

## What is the net work done by the carA racing car of mass 950 kg accelerates from rest with an acceleration of 3.9 m/s^2 for 7.5 s. What is the net work done by the car |

## By how much has the volume decreasedA husband buys a helium-filled anniversary balloon for his wife. The balloon has a volume of 3.0L in the warm store at 74?F. By how much has the volume decreased |

## Compute the linear density of the stringA steel wire with mass 20.5 g and length 1.29 m is strung on a bass so that the distance from the nut to the bridge is 1.10 m. Compute the linear density of the string |

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