A protostar has a temperature of 3000 K,radius of 2*10^8 km at stage 4. At stage 6, it has a temperature of 4500 K and a radius of 1*10^6 km. Calculate the star's change in absolute magnitude as it evolves from stage 4 to stage 6.

## What is the battery voltageThe current in a 51 resistor is 0.14 A. This resistor is in series with a 28 resistor, and the series combination is connected across a battery |

## Determine the average current supplied to the cars motorA 0.954-kg toy car is powered by 2 C cells (3.00V total) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 52.6%, What is the average current supplied to the car\'s motor |

## Find the average frictional force that stops the bulletA 7.80-g bullet moving at 610 m/s penetrates a tree trunk to a depth of 5.80 cm, Use work and energy considerations to find the average frictional force that stops the bullet |

## Find the coefficient of kinetic friction of the surfaceA 9.0-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m, What is the coefficient of kinetic friction, µk, of the surface from A to B |

## In what way would its energy changes similar to pendulumSuppose an object is set sliding, with a speed less than escape velocity, on an infinite frictionless plane in contact with the surface of the Earth. Describe its motion. |

## Explain the capacitorCapacitor 1 with a capacitance of 8.00 µF is connected in series with capacitor 2 of capacitance 2.00 µF, and a potential difference of 100 V is applied across the pair |

## What is the acceleration of the objectAn object is oscilliating on a spring with a period of 4.60 s . At time t= 0.00 s the object has zero speed and is at x = 8.30 cm . What is the acceleration of the object at t= 2.50 s ? |

## Explain what is the average net force on the ballA billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. The mass of the ball is 0.16 kg. The ball approaches the cushion with a velocity of +1.6 m/s and rebounds with a velocity of ?1.2 m/s |

## Estimate the minimum value of v0 requiredIn an X-ray tube electrons strike a tungsten target (W or "wolfram") after being accelerated through a potential difference V0. Estimate the minimum value of V0 required to observe the Kalpha peak. |

## Find out displacement and average velocityThen, 25 s later, the cyclist is 45 m due north of the flagpole, going due east with a speed of 12 m/s. For the cyclist in this 25 s interval, find out each of the following. (a) displacement (b) average velocity (c) average acceleration |

## What is the magnitude of the ball''s total displacementWhat is the electric potential energy of three equal positive charges of 1.33 µC while they are arranged to form a triangle 2.10 x 10-3 m on a side. |

## Calculate the time difference between the two emissionsThree men are riding on a train of proper length L that is moving at speed v = 3/5 c with respect to the ground, Calculate the time difference between the two emissions, in both frames |

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