A 14kg projectile is launched at 380m/s at a 55 (degrees) angle to the horizontal. At the peak of its trajectory it collides with a second projectile moving horizontally, in the opposite direction, at 140m/s . The two stick together and land 9.8km horizontally downrange from the first projectile's launch point. Find the mass of the second projectile. Express your answer using two significant figures in kg.

Find the final velocity of two balls if ball with velocity : 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.) |

Steam locomotive uses the back-and-forth motion : A steam locomotive uses the back-and-forth motion of a drive rod to turn its 1.55 m diameter wheel. Each compete oscillation of the rod corresponds to one wheel revolution.What's the rod's oscillation frequency when the train is moving at 30 m/s ? |

Mounted at angle of 35 degrees on a frictionless incline : A spring is mounted at angle of 35 degrees on a frictionless incline. The spring is compressed by 15 cm where it is allowed to propel a mass of 5.5 kg up the incline. a. if the spring constant is 550 N/m, how fast is the mass moving when it leaves th.. |

Object lies between the focal point and the mirror : A concave mirror has a focal length of 25.8 cm. The distance between an object and its image is 51.4 cm. Find (a) the object and (b) image distances, assuming that the object lies beyond the center of curvature and (c) the object and (d) image distan.. |

Find the mass of the second projectile : A 14kg projectile is launched at 380m/s at a 55 (degrees) angle to the horizontal. At the peak of its trajectory it collides with a second projectile moving horizontally, in the opposite direction, at 140m/s . The two stick together and land 9.8km ho.. |

Finish listening to your favorite compact disc : As you finish listening to your favorite compact disc (CD), the CD in the player slows down to a stop. Assume that the CD spins down with a constant angular acceleration. Part A If the CD rotates clockwise (let's take clockwise rotation as positiv.. |

Study electrical oscillations in the human brain : Physicians use electroencephalograms (EEGs) to study electrical oscillations in the human brain. So-called beta oscillations, whose enhancement has been linked to alcoholism, have frequencies from 12 to 30 Hz . What's the corresponding range in perio.. |

What is the magnitude of the change in its momentum : A 1870 kg truck traveling north at 37 km/h turns east and accelerates to 52 km/h. (a) What is the change in the truck's kinetic energy? (b) What is the magnitude of the change in its momentum? |

Magnitude of the larger of the two resistances : When a 42.0-V emf device is placed across two resistors in series, a current of 12.0 A is flowing in each of the resistors. When the same emf device is placed across the same two resistors in parallel, the current through the emf device is 62.0 A. Wh.. |

## Find the magnitude of the resulting magnetic fieldA sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere. |

## Find the equivalent resistanceA resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners. |

## What is the electric field at the locationQuestion: Field and force with three charges? What is the electric field at the location of Q1, due to Q 2 ? |

## What is the maximum displacement of the bridge deckWhat is the maximum displacement of the bridge deck? |

## What is the magnitude of the current in the wireWhat is the magnitude of the current in the wire as a function of time? |

## Introductory mechanics: dynamicsCalculate the smallest coefficient of static friction necessary for mass A to remain stationary. |

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