The current in a simple series circuit is 5.40 A. When an additional resistance of 8.60 ohms is inserted, the current drops to 4.40 A. What was the resistance (in ohms) of the original circuit?

Estimate the length of the pendulum : The maximum speed of the pendulum bob in a grandfather clock is 0.45 m/s. what is the length of the pendulum |

Explain the blade of an ice skate is ground to a knife edge : The blade of an ice skate is ground to a knife edge on each side of the skate. If the width of the knife edge is 0.001in., and the length of the skate in contact with the ice is 3 in., calculate the pressure exerted on the ice by a 150lb man. |

How high up the ramp does the ball roll : A ball (spherical shell of mass M and radius R) rolls without slipping up a ramp. If the ball's initial speed is v, how high up the ramp does the ball roll |

Explain the concentrations of the ionic species : Determine the concentrations of the following ionic species present in a 0.333 M solution of the diprotic acid H2SO3. For H2SO3, Ka1 = 1.4E-2, Ka2 = 6.3E-8. |

What was the resistance of the original circuit : The current in a simple series circuit is 5.40 A. When an additional resistance of 8.60 ohms is inserted, What was the resistance (in ohms) of the original circuit |

Explain gibbs energy of a certain constant-pressure process : The change in the Gibbs energy of a certain constant-pressure process as a function of temperature was found to fit the expression ?G (J K-1)=-73.1 J +42.8T. Calculate the value of S for the process. |

Determine the work done by the air on the lungs : A person takes in a breath of -2 degrees C air and holds it until it warms to 37.5 degrees C. Determine the work done by the air on the lungs |

Explain the milky jiuce that exudes from unripe poppy : The addictive painkiller morphine, C17H19NO3, is the principal molecule in the milky jiuce that exudes from unripe poppy seed capsules. Calculate the pH of a 0.0227 M solution of morphine, given that Kb = 7.9E-7.? |

Evaluate the size of a hydrogen atom : Calculate the 'size' of a hydrogen atom in its ground state according to this definition. Go on to explore how the 'size' varies as the definition is changed to other precentages, and plot your conclusion. |

## Q1 a potential difference of 87 mv exists between the innerq1. a potential difference of 87 mv exists between the inner and outer surfaces of a cell membrane. the inner surface |

## Estimate the magnification of the microscopeA microscope uses an eyepiece with a focal length of 1.43 cm. What is the magnification of the microscope |

## What is the speed of each star at the moment of impactTwo stars are at rest 1.0×1014m apart. This is about 10 times the diameter of the solar system. What is the speed of each star at the moment of impact |

## Find the change in entropy of the surrounding airAn electric motor rotating a workshop grinding wheel at a rate of 107 rev/min is switched off. Assume the wheel has the constant negative angular acceleration of magnitude 1.70 rad/s2. |

## Evaluate the magnitude of the normal forceUsing Newton's laws, Evaluate the magnitude of the normal force that the floor exerts on the chair. |

## How many electrons leave the battery per minuteA 9.0-V battery is connected to a bulb whose resistance is 2.7Ω. How many electrons leave the battery per minute |

## How greatly time elapses before the compass hits the groundHow greatly time elapses before the compass hits the ground |

## Determine the saturation pressure and temperature of waterA sealed rigid tank contains 5.0 kg of water (liquid plus vapor) at 100 oC with a quality of 30.375%. Using the Thermodynamic Tables and the relationship between quality and other thermodynamic properties |

## Draw free body diagrama for the girl and the sledA 40.0 kg girl and a 8.4 kg sled are on on ice (frection coefficient 0.01) of a frozen lake, draw free body diagrama for the girl and the sled |

## What is the maximum speed of the oscillationA passenger car traveling down a rough road bounces up and down at 1.3 Hz with a maximum vertical acceleration of 0.20 m/s^2, What is the maximum speed of the oscillation |

## Calculate the necessary amount of charge on the marbleYou and a friend have been given the task of designing a display for the Physics building that will demonstrate the strength of the electric force, calculate the necessary amount of charge on the marble for a reasonable ramp angle of 15 degrees |

## Find out the magnitude of the acceleration of particleAn 8.00 point mass and a 15 point mass are held in place 50 apart. A particle of mass is released from a point between the two masses 13.00 from the 8 mass along the line connecting the two fixed masses. |

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