A hook in boxing primarily involves horizontal flexion of the shoulder, while maintaining a constant angle at the below. During this punch, the horizontal flexor muscles of the shoulder contract and shorten at an average speed of 75 cm/s. They move through an arc length of 5 cm during the hook, while the fist moves through an arc length of 100 cm. What is the average speed of the fist during the hook?

## Use the concepts of impulse and momentumA rifle with a barrel length of 56 fires an 8 bullet with a horizontal speed of 350. The bullet strikes a block of wood and penetrates to a depth of 14. (a) What resistive force (assumed to be constant) does the wood exert on the bullet? (b) How long.. |

## Calculate the fast neutron flux needed to produce the injuryCalculate the fast neutron flux needed to produce the same injury as 0.50 mSv/hr of thermal neutrons, and then, as 6,000 thermal neutrons per sq. cm per sec. |

## Find the suitcase coefficient of kinetic friction on floorA baggage handler throws a 20kg suitcase along the floor of an airplane luggage compartment with a speed of 1.2 m/s. What is the suitcase's coefficient of kinetic friction on the floor |

## What is the velocity of the ballHow large does the radius R of the dish have to be to attain electric field vector amplitude of 0.1mV/m at the receiver. |

## What is the change in gravitational potential energyA 20kg box slides up a 12m long incline at an angle of 30 degrees with the horizontal. What is the change in gravitational potential energy |

## Determine angular momentum of a particleFor a particle of mass m and charge q moving in a circular path in a magnetic field B, Find angular momentum of a particle about the center of the circle |

## Questiona place kicker must kick a football from a pointquestiona place kicker must kick a football from a point 25.0 m 27.3 yd from the goal and the ball has to clear the |

## Find the direction of the birds accelerationAn Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 9.60 m/s in 4.20 s. What is the magnitude and direction of the bird's acceleration |

## Find the force constant of the springIn a control system, an accelerometer consists of a 4.99-g object sliding on a calibrated horizontal rail, Find the force constant of the spring required for the calibration to be correct |

## What is the angular magnification of the magnifierA lens has a focal length of 40 mm magnifier. An object viewed with the magnifier is 5.3 mm tall, What is the angular magnification of the magnifier |

## What will be the potential difference across the light bulbInstead of using batteries, a certain type of flashlight has a built in hand pump which you can squeeze to generate the power necessary to light the bulb, what will be the potential difference across the light bulb |

## How long is the diver in the airA diver pushes off horizontally from the top of a vertical cliff that is 40.0 m high from water surface below. How long is the diver in the air |

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