LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0mm--diameter laser beam with a wavelength of 193nm . Each laser pulse lasts 15ns and contains 1.9mJ of light energy. What is the power of one laser pulse? Answer in W/m2. During the very brief time of the pulse, what is the intensity of the light wave? Answer in dB.

Explain the principle quantum level for the final state : An excited hydrogen atom with an electron in the n=5 state emits light having frequency of (6.9 x 10^14)(s^-1). what is the principle quantum level for the final state in this electronic transition |

How many joules of solar energy fall on your back : The intensity of electromagnetic waves from the sun is 1.4 kW/m2 just above the earth's atmosphere. How many joules of solar energy fall on your back as you work on your tan for 0.90h |

An egg rolls off a kitchen counter and breaks : 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.. |

Find the tension in the rope connecting the two masses : The rope and two masses are suspended from the ceiling of an elevator which is accelerating downward at 2.8 m/s^2. If each of the masses is 3.7 kg, find the tension in the rope connecting the two masses. |

Find what is the intensity of the light wave : LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. what is the intensity of the light wave |

Balanced scorecard : What is a "Balanced Scorecard" in modern health care delivery? How did this idea emerge in U. S. medicine? Do you support this approach to measure health care performance? Why, or why not? |

Explain why was it reasonable that such a model exists : Why was it reasonable that such a model exists and what evidence was there that it works. why do we no longer believe in it |

Determine the average force that the fist exerts on the head : According to a report on traumatic brain injury, the force that a professional boxer's fst exerts on his opponent's head is equivalent to being hit with a 5.9kg bowling ball traveling at 8.9m/s that stops in 0.018s. Determine the average force that t.. |

How many photons are emitted in this pulse : A pulse from a ruby laser (lambda = 694.3 nm) has an average power of 30 MW and lasts 2.9 ns. How many photons are emitted in this pulse |

## How far did he slide down the poleStarting from rest, a 98-kg firefighter slides down a fire pole. How far did he slide down the pole |

## Boxes are transported from one location to anotherBoxes are transported from one location to another in the ware-house by means of a conveyor belt that moves with a constant speed of 0.50m/s. At a certain location the conveyor belt moves for 2.00 m up an incline that makes an angle of 10° with the h.. |

## Find out the tension in the ropeThe ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.870, and the log has an acceleration of 0.800 m/s2. Find out the tension in the rope. |

## What is the maximum stretch of the springA spring with stiffness 125 N/m and relaxed length 0.50 m hangs vertically from the ceiling. what is the maximum stretch of the spring |

## Find the angle between emerging right and left polarized rayThe component prisms are 70-20-90 degrees. the angle between the emerging right and left polarized rays |

## Calculate the angular accelerationa high speed cooling fan has a maximum angular speed of 15.0 rad/sec, calculate the angular acceleration when the device goes from idle speed to operational speed |

## Find the net external torque that acts on each wheelTwo wheels have the same mass and radius of 4.8 kg and 0.50 m, respectively. Find the net external torque that acts on each wheel |

## Calculate minimum force he must exert to get moving backa contestant in a winter games event pushes a 31 kg block of ice across a frozen lake. the coefficient of static friction is 0.1, Calculate minimum Force he must exert to get moving back |

## How long will it take before coin begins to slide radiallyA coin is placed on a turntable 13 cm from the center. A lump of clay placed behind the coin prevents it from sliding backwards , How long will it take before the coin begins to slide radially |

## Find the size of the contact force between the two blocksTwo blocks are stacked on a frictionless table. A horizontal force F is applied to M2. If M1=1.39kg, M2=3.02 Kg, and F=6.3 N, find the size of the contact force between the two blocks |

## What is the number of conduction electronsWhat is the number of conduction electrons. A centrifuge rotor has a moment of inertia of 3.40 x10-2 kg·m2. How much energy is required to bring it from rest to 8000 rpm. |

## What is the radial acceleration of the mercuryThe radius of the earth's orbit around the sun (assumed to be circular) is 1.50 x 10^8 km, and the earth travels around this orbit in 365 days. What is the radial acceleration of the Mercury |

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