a hoop of mass M=2 kg and radius R=0.4 m rolls without slipping down a hill. The lack of slipping means that when the center of mas of the hoop has speed V, the tangential speed of the hoop relative to the center of mass is equal to Vcm,since in that case the instantaneous speed is zero for the part of the hoop that is in contact with the ground (v-v=0). The initial speed of the hoop is Vinitial =2m/s, and the hill has a height of H=4.1 m. what is the speed Vfinal at the bottom of the hill?

Determine what is the efficiency of the solar cell : A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1000 W/m2 sunlight. What is the efficiency of the solar cell |

To decrease the body temperature : To decrease the body temperature of a 66-kg person by 1.0 C , what mass of alcohol must be evaporated from the person's skin? Ignore the heat involved in raising the temperature of alcohol to its boiling point (why?) and approximate the human body as.. |

System when the stick is pivoted about axis perpendicular : A particle of mass 0.450 kg is attached to the 100-cm mark of a meter stick of mass 0.125 kg. The meter stick rotates on a frictionless, horizontal table with an angular speed of 2.00 rad/s. |

Find the work done by the machine : A machine does work at a rate given by Pct^2 , where c = 15W/s^2 and t is time. Find the work done by the machine between 15s and 20s? huh |

What is the speed at the bottom of the hill : a hoop of mass M=2 kg and radius R=0.4 m rolls without slipping down a hill. what is the speed Vfinal at the bottom of the hill |

Find the atoms maximum speed : An atom in a solid vibrates at 10THz with amplitude 10pm. Find the atom's maximum speed |

Explain the sum of the coefficients in the balanced equation : The following reaction occurs in basic solutions. What is the sum of the coefficients in the balanced equation. MnO4- + NH3 ----> NO3- + MnO2 |

Determine what is the oscillators speed : A simple harmonic oscillator has spring constant k = 6.6N/m , amplitude A = 12cm , and maximum speed 4.6m/s. What's the oscillator's speed when it's at x = 5.8cm |

Recalling that an object smaller than the wavelength : Recalling that an object smaller than the wavelength illuminating it cannot be "seen", what is the minimum kinetic energy of electrons needed in an electron microscope in order to "see" an atoms whose diameter is 0.1 nm, about the size of a silicon a.. |

## Calculate the total momentum of the systemA cart of mass 1.91kg traveling 1.29m/s inelastically strikes a stationary mass of 0.41kg. What is the total momentum of the system |

## What is the mass of the second carA 8500 kg boxcar traveling at 16.8 m/s strikes a second boxcar at rest. What is the mass of the second car |

## Determine what is the mass of each sphereIf two tiny identical spheres attract each other with a force of 2.00 when they are 26.0 apart, what is the mass of each sphere |

## What is her average speed for the round tripAn athlete swims the length L of a pool in a time t1 and makes the return trip to the starting poisition in a time t2. What is her average speed for the round trip |

## What force is exerted on the bulletA 4.7-g bullet leaves the muzzle of a rifle with a speed of 334 m/s. What force (assumed constant) is exerted on the bullet |

## Determine the voltage at the motor terminalsDetermine the voltage at the motor terminals - mesh analysis with one loop including the source |

## Compute the magnetic field at the center of the coilA closely wound circular coil with a diameter of 4.00cm has 600 turns and carries a current of 0.500 A. What is the magnetic field at the center of the coil |

## What is the torque on the particle around the originA force F = 4.2 Ni + 3.7 Nj + 1.2 Nk acts on a particle located at x = 3.3 m. What is the torque on the particle around the origin |

## How fast is the rock star moving relative to the earthAn intergalactic rock star bangs his drum every 1.70 s. How fast is the rock star moving relative to the earth |

## Q1 a rocket moves with a velocity of 0818c to the rightq1. a rocket moves with a velocity of 0.818c to the right with respect to a stationary observer a. an observer b moving |

## What net force is exerted on the shipTwo tug boats are towing a ship. Each exerts a horizontal force of 5 tons and the angle between their towropes is 90 degrees. What net force is exerted on the ship? |

## What is the force exerted on the liquid by the potA 3 kg flowerpot drops from a tall building. The initial speed of the pot is zero, and you may neglect air resistance. What is the force exerted on the liquid by the pot |

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