Find the final velocity of the two balls if the ball with velocity v2i = ?20.9 cm/s has a mass equal to half that of the ball with initial velocity v1i = +32.1 cm/s. (Indicate the direction with the sign of your answer.)

## What is this energy worth per dayThe nearby town of Bellefonte, PA features the Gamble Mill, an old mill originally used to grind grain into flour - 1800s hydropower. At $0.07 per kWh, what is this energy worth per day |

## What is the diameter and lenght of the wireA cylindrical 98.50 ? resistor is made from a coil of copper wire whose total mass is 74.0 g, What is the diameter and lenght of the wire |

## Find the gauge pressure at the bottom of the tankA storage tank 27 m high is filled with pure water, Calculate the magnitude of the net force that acts on a square access hatch at the bottom of the tank that measures 0.6 m by 0.6 m |

## Find the direction the magnetic force on the electronAn electron (charge=-1.6x10^-19C) is moving at 3x10^5 m/s in the positive x direction. What are the magnitude and direction the magnetic force on the electron |

## Determine the field strengthA proton moves at 7.50 X 10 ^7 m/s, perpendicular to a magnetic field. The field causes the proton to travel in a circular path of radius 0.800m. |

## How much heat energy can created throughout motionHow much heat energy can created throughout motion |

## What is the thickness of the ice layerWhite light is shone on a very thin layer of ice (n = 1.31), and above the ice layer, What is the thickness of the ice layer |

## Find the length of the tubeOne of the harmonic frequencies of tube A with only one end open is 1080 Hz. The next-highest harmonic frequency is 1320 Hz. Find the length of the tube A |

## What is the expression for the particles velocityThe motion of a particle is given by x= Asin^3(wt). What is the expression for the particle's velocity |

## What pressure do they exert on the wallThe mass of the H2 molecule is 3.3x10-24 g. If 1023 hydrogen molecules per second strike 2.0 cm2 of wall at an angle of 45° with the normal when moving a speed of 105 cm/s |

## Calculate the index of refraction of the substanceThe critical angle for total internal reflection for sapphire surrounded by air is 34.4°. Calculate the index of refraction of the substance |

## Find how far the textbook moves from its initial positionA 2.40-kg textbook is forced against a horizontal spring of negligible mass and force constant 300 N/m , compressing the spring a distance of 0.260m. find how far the textbook moves from its initial position before coming to rest |

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