A small rock with mass 0.12 is fastened to a massless string with length 0.80 to form a pendulum. The pendulum is swinging so as to make a maximum angle of 45 with the vertical. Air resistance is negligible. Part A What is the speed of the rock when the string passes through the vertical position? Express your answer using two significant figures. Part B What is the tension in the string when it makes an angle of with the vertical? Express your answer using two significant figures. Part C What is the tension in the string as it passes through the vertical? Express your answer using two significant figures.

Lightbulb is plugged into standard-resistance of bulb : A 100 W lightbulb is plugged into a standard 120 V outlet. How much does it cost per month (30 days) to leave the light turned on continuosly? Assume electrical energy costs 7.5/kWh. (Enter dollars with no unit) What is the resistance of the bulb? Wh.. |

Calculate the current and calculate the current density : A potential difference of 4.80 V will be applied to a 43.00 m length of 18-gauge copper wire (diameter = 0.0400inches). Calculate the current. Calculate the current density. Calculate the electric field. Calculate the rate at which thermal energy wil.. |

A nichrome heater dissipates : A Nichrome heater dissipates 450 W when the applied potential difference is 110 V and the wire temperature is 700°C. What would be the dissipation rate if the wire temperature were held at 200°C by immersing the wire in a bath of cooking oil? The app.. |

What is the density of the fluid : An aluminum cylinder is suspended in an unknown fluid by a spring scale. Outside the fluid, the object weighs 20N. In the fluid it weighs 10N. If the cylinder has a volume of 10–4m3, what is the density of the fluid? |

What is tension in the string as it passes through vertical : A small rock with mass 0.12 is fastened to a massless string with length 0.80 to form a pendulum. The pendulum is swinging so as to make a maximum angle of 45 with the vertical. Air resistance is negligible. |

What is resistance ratio RA-RB-measured between their ends : Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1.0 mm. Conductor B is a hollow tube of outside diameter 4.1 mm and inside diameter 3.1 mm. What is the resistance ratio RA/RB , measured b.. |

Calculate the temperature at which a tung- sten filament : Calculate the temperature at which a tung- sten filament that has an emissivity of 0.25 and a surface area of 6.6×10?5 m2 will radiate energy at the rate of 51Win a roomwhere the temperature is 26?C. The Stefan-Boltzmann constant is 5.6696 × 10?8 W/m.. |

What is the current in the diameter section : A 3.00- length of copper wire at 20 has a 1.20--long section with diameter 1.8 and a 1.80--long section with diameter 0.90 . There is a current of 2.5 in the 1.8 -diameter section. What is the current in the 0.90 -diameter section? What is the magnit.. |

Silver is the best heat conductor of all metals : A pipe 0.026 m in diameter and 0.22 m long can transfer 3476 J of heat per second with a temperature difference across the ends of 7?C. Compare this performance with the heat transfer of a solid silver bar of the same di- mensions by finding the rati.. |

## Determine the speed of the large cart after the collisonA small, 300 g cart is moving at 1.30 m/s on an air track when it collides with a larger, 4.00 kg cart at rest. What is the speed of the large cart after the collison |

## Explain how the temperature can affect the magnetizationPierre Curie discovered through experiment that the magnetization of a paramagnetic material is directly proportional to the strength of an external magnetic field and inversely proportional to the temperature in degrees Kelvin |

## Where the electric potential equals zeroA positive charge Q1 = 3.00 µC is in the origin and a negative charge Q2 = -5.00 µC is at point x = 11m. where the electric potential equals zero |

## Illustrate what is the magnitude of object accelerationThe plane is inclined at an angle of 24.9 degrees with the horizontal. Using the accerlation due gravity from your reference table. Illustrate what is the magnitude of object's acceleration? |

## What is the persons absorbed doseOver a year's time, a person receives a biologically equivalent dose of 21 mrem (millirems) from cosmic rays, What is the person's absorbed dose in rads |

## Evaluate the angle through which the part rotatesA machine part rotates at an angular speed of 0.66 rad/s; its speed is then increased to 3.0 rad/s at an angular acceleration of 0.66 rad/s2. Find the angle through which the part rotates |

## Explain how much will it drop by time it reaches catcherA pitcher throws a baseball at 41.0 m/s. If the ball thrown horizontally at this speed, explain how much will it drop by the time it reaches the catcher who is 17.0 m away from the point of release? |

## Compare its potential energies at a, b, and oA 25.0g arrow is shot through a 7.8 cm apple. If the arrow enters the apple at 38.8 m/s and emerges with a speed of 30.10m/s in the same direction, what is the magnitude of force with which the apple has resisted the arrow. |

## What is the magnitude of the second chargeA negative charge of -2.0 multiplied by 10-4 C and a positive charge of 9.5 multiplied by 10-4 C are divided by 0.30 m. What is the force between the two charges. |

## What are the strength and direction of the electric fieldA hollow metal sphere has 6 cm and 10 cm inner and outer radii, respectively, What are the strength and direction of the electric fi eld at points 4, 8, and 12 cm from the centre |

## What is its average rotational accelerationA variable-speed drill, initially turning at 250 rpm, speeds up to 1300 rpm in a time interval of 0.1 s. What is its average rotational acceleration |

## What is the peak charge on the capacitorA 500 \mu F capacitor is connected across a 1.25 H inductor. At a certain time, the charge on the capacitor is zero and the current is 0.347 A. What is the peak charge on the capacitor |

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