In Figure 20.12, a small particle of charge q = -7.0 x 10^-6 C and mass (m = 3.1x10^-12) has velocity (Vo = 9.4x10^3 m/s) as it enters a region of uniform magnetic field. The particle is observed to travel in the semicircular path shown, with radius r = 5 cm. Calculate the (a) magnitude and (b) direction of the magnetic field in the region.

Two straight wires run parallel to each other : Two straight wires run parallel to each other, each carrying a current in the direction shown below. The two wires experience a force in which direction? B) What happens when one of the currents is turned off? |

According to the definition of work : According to the definition of work, the work done by an external force in moving a heavy crate along a horizontal surface should be the same whether the force is pulling upward at a 45 degree angle or pushing downward at a 45 degree angle. In practi.. |

Solid uniform spherical boulder rolls down the hill : A solid uniform spherical boulder rolls down the hill as shown in the figure(Figure 1) , starting from rest when it is H = 43.0{\rm m} above the bottom. The upper half of the hill is free of ice, so the boulder rolls without slipping. But the lower h.. |

Two blocks are connected by a light cord : Two blocks are connected by a light cord. One block, of mass 4kg, sits on a horizontal table with static and kinetic coefficients of friction of 0.6 and 0.4, respectively, whereas the other block, of 2 kg mass, hangs over a frictionless light pull.. |

Calculate magnitude-direction of magnetic field in region : In Figure 20.12, a small particle of charge q = -7.0 x 10^-6 C and mass (m = 3.1x10^-12) has velocity (Vo = 9.4x10^3 m/s) as it enters a region of uniform magnetic field. The particle is observed to travel in the semicircular path shown, with radius .. |

Beam of electron is accelerated through potential difference : A beam of electrons is accelerated through a potential difference of 10 kV before entering a region having uniform electric and magnetic fields that are perpendicular to each other and perpendicular to the direction in which the electron is moving. I.. |

Two blocks are attached by a light string : Two blocks are attached by a light string with one resting on a rough table and the other hanging over the edge via a frictionless pulley. If the blocks are initially at rest, the tension force is equal to the hanging weight. |

Magnitude of the electric field inside this metal filament : The tungsten filament in the 36 ohm bulb is 8 mm long and has a cross-sectional area of 2e-10 m^2. What is the magnitude of the electric field inside this metal filament? |

What is the maximum stretch during the motion : A horizontal spring-mass system has low friction, spring stiffness 200 N/m, and mass 0.4 kg. The system is released with an initial compression of the spring of 11 cm and an initial speed of the mass of 3 m/s. |

## Determine the total entropy change of a liquid at a tempA mass M of a liquid at a temperature T1 is mixed with an equal mass of the same liquid at a temperature of T2. The system is thermally insulated. If C is themperature-independent specific heat of that liquid |

## How much has the vertical height of the skater changedA 57.4-kg skateboarder starts out with a speed of 2.04 m/s. He does 104 J of work on himself by pushing with his feet against the ground. How much has the vertical height of the skater changed |

## What is the maximum height the box will reachA box of mass of mass 2 kg is placed on a spring such that when the box is released, the spring will push the box directly upward. what is the maximum height the box will reach |

## Obtain the angle through which the blade has turnedA circular saw blade 0.180m in diameter starts from rest. Find the angular acceleration and the angle through which the blade has turned in this time |

## How much power is delivered to the buildingA power station uses 100 kV to deliver power to a building. The building has a total resistance of 12.5kV. How much power is delivered to the building |

## Write down a description for the force acting on himDraw a free body diagram for the skydiver in the instant after he jumps.(Assume that at this point his velocity is near zero so that air resistance is still negligible.) |

## What is the maximum enlargementAn enlarging camera has a maximum extension of 4 ft between the negtive and the paper. what is the maximum enlargement that can be made with this equipment |

## Explain how many hours will it take to warmSolar energy is incident on the pond at an average rate of 400 . If the water absorbs all the solar energy and does not exchange energy with its surroundings, explain how many hours will it take to warm from 15 to 25 ? |

## What min initial speed should puck have been givenIn attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 2.47 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice. |

## Find the velocity of the water in the wider sectionA pipe has a narrow end compared to the other end. The area of the narrow section is one-half the area of the wide section. find the velocity of the water in the wider section |

## Estimate the thickness of steelEstimate the thickness of steel (density 8 g/cm3) needed to stop a proton of momentum 2 GeV/c. Then, for the same thickness of steel, calculate the energy loss of a 2 GeV/c gamma ray. |

## Calculate the speed of the windA seagull flies with a velocity of 12.5 m/s straight into the wind. (ie.. this the velocity of the gull relative to the wind), Calculate the speed of the wind |

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