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 its angular momentum : A turntable of mass 5.01 kg has a radius of 0.129 m and spins with a frequency of 0.530 rev/s. What is its angular momentum? Assume the turntable is a uniform disk. |

Horizontal surface does the sphere rise on the incline : A solid sphere of mass 0.524 kg rolls without slipping along a horizontal surface with a translational speed of 5.33 m/s. It comes to an incline that makes an angle of 31.7° with the horizontal surface. Ignoring energy losses due to friction, to what.. |

A spinning flywheel has rotational inertia : A spinning flywheel has rotational inertia I = 417 kg·m2. Its angular velocity decreases from 19.5 rad/s to zero in 320 s due to friction. What is the frictional torque acting? Take positive to be "with the flywheel's rotation", and negative to be "o.. |

Two rocket ship travel in same direction with relative speed : Two rocket ships travel in the same direction with a relative speed of .98c. a light pulse is fired from the back of one of the ships to the front of the same ship of length deltaX=20m. |

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... |

## Calculate the total kinetic energy of the barbellA barbell spins around a pivot at its center at A. The barbell consists of two small balls, each with mass 450 grams (0.45 kg), at the ends of a very low mass rod of length d = 35 cm, calculate the total kinetic energy of the barbell |

## What is the speed of the electron when it exits the holeAn old-style TV set places 20 kV across two plates of a parallel plate capacitor. What is the speed of the electron when it exits the hole in the plate |

## What is the magnitude and direction of the magnetic fieldAn electric current I=5.0 amp flows down the y-axis and to the right on the x-axis. What is the magnitude and direction of the magnetic field at a point in the x-y plane with coordinates (a,a) where a=20 cm |

## What is its speed as it exits the shower-head openingsA shower head has 30 circular openings, each with radius 1.0 mm. The shower head is connected to a pipe with radius 0.80 cm. If the speed of water in the pipe is 2.2 m/s, what is its speed as it exits the shower-head openings? |

## Compute the position of the image formed by the lensA small object is placed to the left of a convex lens and on the optical axis. compute the position of the image formed by the lens |

## Calculate the speed of each particleAn electron and a proton are each placed at rest in a uniform electric field of magnitude 564 N/C. Calculate the speed of each particle 44.4 ns after being released. |

## What is the maximum electric field strength createdDuring normal beating, the heart creates a maximum 4.30 mV potential across 0.330 m of a person's chest, What is the maximum electric field strength created |

## Find what direction should his boat be headedA man can row a boat at a speed of 7.45 km/h in still water. If he is crossing a river where the current is 2.00 km/h, find what direction should his boat be headed |

## What potential difference between the two wiresA person can be killed if a current as small as 50 mA passes near the heart. An electrician is working on a humid day with hands damp from perspiration. What potential difference between the two wires |

## What happens to combined angular momentum of the ladybugA ladybug is sitting at the center of a turntable. The turntable is rotating on a frictionless bearings and it rotates without assistance from a motor. As the ladybug walks to the edge of the turntable, what happens to combined angular momentum of.. |

## What is the intensity of the electromagnetic waveThe wave function for a certain electromagnetic wave is given by E = -(2500V/m)cos(9.973x10^6z - 2.992x10^15t)i, what is the intensity of the electromagnetic wave |

## How fast is the roller coaster traveling at bottom of dipA roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. how fast is the roller coaster traveling at the bottom of the dip |

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