A transformer consists of 300 primary windings and 832 secondary windings. 1. If the potential difference across the primary coil is 22.5 V , what is the voltage across the secondary coil? 2. If the potential difference across the primary coil is 22.5 V , what is the effective load resistance of the secondary coil if it is connected across a 110 ohm resistor?

A rod is being used as a lever : A rod is being used as a lever, as shown in the figure below. The fulcrum is x1 = 1.79 m from the load and x2 = 3.81 m from the applied force. If the load has a mass of 12.8 kg, what force must be applied to lift the load? |

What is magnitude of the magnetic flux through this circle : A circular area with a radius of 7.40 lies in the x-y plane. What is the magnitude of the magnetic flux through this circle due to a uniform magnetic field B= 0.232 T that points in the +z direction? |

Uniform magnetic field along the axis of the coil : A coil of wire with 210 circular turns of radius 3.30 cm is in a uniform magnetic field along the axis of the coil. The coil has R= 42.8 ohm. At what rate, in teslas per second, must the magnetic field be changing to induce a current of 0.155 A in th.. |

An egg rolls off kitchen counter and breaks as it hits floor : An egg rolls off a kitchen counter and breaks as it hits the floor. How large is the impulse that the floor exers on the egg, and how large is the force exerted on the egg by the floor when stopping it? The counter is 1.0mhigh, the mass of the egg is.. |

What is the effective load resistance of the secondary coil : A transformer consists of 300 primary windings and 832 secondary windings. 1. If the potential difference across the primary coil is 22.5 V , what is the voltage across the secondary coil? 2. If the potential difference across the primary coil is 22... |

What will be the current in the secondary coil : You need a transformer that will draw 16 W of power from a 220 V (rms) power line, stepping the voltage down to 12 V (rms) What will be the current in the secondary coil? Express your answer to two significant figures and include the appropriate un.. |

Current in the circuit to reach half of its maximum value : A 1.80 mH inductor is connected in series with a dc battery of negligible internal resistance, a 0.840 k-ohm resistor, and an open switch. How long after the switch is closed will it take for the current in the circuit to reach half of its maximum.. |

What is the angular frequency of the charge oscillations : A 18.0 uF capacitor and a 5.40 mH inductor are connected in series with an open switch. The capacitor is initially charged to 6.50 uC. What is the angular frequency of the charge oscillations in the capacitor after the switch is closed? |

Explain why the periscope no long works : A periscope for a submarine uses two totally reflection 45°-45°-90° prisms with total internal reflection on the side adjacent to the 45° angles. It springs a leak, and the bottom prism is covered with water. Explain why the periscope no long works. .. |

## Find the magnetic flux through given loopA square loop of wire encloses area A1. What is the magnetic flux through loop A1 |

## Illustrate what are the velocities of the two peoplehe first person is initially moving forward with a speed of 2.50 m/s, and the second person is initially at rest. Illustrate what are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and .. |

## What angular speed must such a cylinderHow long would it be on the incline before it arrives back at bottom. |

## Find the resultant torqueA vector force F= 6i + 5j N causes a torque on the end of vector distance R= 3i m. Use the cross product to find the resultant torque |

## Find the angle between the refracted blue and red raysA car crashes into a wall at 25 m/s and its contents are brought to rest in 0.1s. display that the average force exerted on a 75-kg test dummy by the seat belt is more than 18,000 N. |

## Determine the work done by the engineA 2000kg car accelerates from 20 to 60km/h on an uphill road. Determine the work done by the engine |

## Determine the necessary value for lThe scale of a spring balance reading from 0 to 235rm {N} has a length of 15 rm{cm}. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.7rm {Hz}. What is the mass of fish? In Kg. |

## What are the final velocities of carsThey result in elastic collision. Car a is moving towards car b with velocity of 3 m/s and car b is moving toward car a with velocity of 11 m/s. what are the final velocities of cars |

## Estimate the intensity of the laser beamA laser emits a narrow beam of light. The radius of the beam is 1.5 mm, and the power is 2.9 mW. What is the intensity of the laser beam |

## Find the wavelength of maximum intensityUse the blackbody radiation law to estimate the wavelength of maximum intensity for the light from the sun's photoshere |

## Determine the frequency of the radio stationA resonant circuit in a radio receiver is tuned to a certain station when the inductor has a value of 1.00 µH and the capacitor has a value of 1.90 pF. Find the frequency of the radio station |

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