A 255 kg piano slides 4.2 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40 Figure 6-36

(a) Calculate the force exerted by the man. N (b) Calculate the work done by the man on the piano. J (c) Calculate the work done by the friction force. J (d) What is the work done by the force of gravity? J (e) What is the net work done on the piano? j

Cylinder with height-inside diameter use to hold propane gas : A cylinder with a height of 1.30 and an inside diameter of 0.110 is used to hold propane gas (molar mass 44.1 ) for use in a barbecue. It is initially filled with gas until the gauge pressure reads 1.80×106 and the temperature is 22.0. The temperatur.. |

How much energy was lost in the collision : A 10 g bullet moving 1000 m/s strikes and passes through a 2.0-kg block initially at rest, as shown. The bullet emerges from the block with a speed of 400 m/s. (a) How much energy was lost in the collision? (b) Calculate the average force exerted on .. |

Find the X coordinate of Xcm of the center of mass : There is a system of three particles which have masses of M, 2M, and 3M as indicated M------2m------3m [----L----][----L----] find the X coordinate of Xcm of the center of mass. Assume that the particle M is at the origin and the positive x axis is d.. |

Determine radial velocity of ring as it reaches moving end : A ring is fitted loosely (with no friction) around a long, smooth rod of length L = 0.561 m. The rod is fixed at one end, and the other end is spun in a horizontal circle at a constant angular velocity of ? = 3.57 rad/s. The ring has zero radial velo.. |

What is the work done by the force of gravity : A 255 kg piano slides 4.2 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40 Figure 6-36 |

What is the magnitude of the EMF in millivolts : An astronaut who is repairing the outside of her spaceship accidently pushes away a 98.9-cm-long steel rod, which flies off at 10.5 m/s, never to be seen again. As it happens, the rod is oriented perpendicularly to the magnetic field in that region o.. |

Find the work done by the dogs after pulling the sled : A 100 kg sled is slid across a smooth ice field by a group of four dogs tied to the sled pulling with a 350 N force along a rope at an angle of 20 degrees above the horizontal. (a) If the sled travels at a constant speed, find the drag force on the s.. |

What is the magnitude and direction of the velocity of m2 : A cart of mass m1 = 0.500 kg moves with a velocity of 0.900 m/s to the right on a frictionless track. It collides with another cart of mass m2 = 0.500 kg at rest. Car m1 stops and m2 moves in the direction that m1 was traveling. What is the magnitude.. |

Values appropriate for the earth''s magnetic field : Assume the magnitude of the magnetic field outside a sphere of radius R is B = B0(R/r)^2, where B0 is a constant. (a) Determine the total energy stored in the magnetic field outside the sphere. (b) Evaluate your result from part (a) for B0 = 5e-5 T a.. |

## Q1 a basketball player achieves a hang time of 658 s inq1. a basketball player achieves a hang time of .658 s in dunking the ball. what vertical height will he attain? the |

## Estimate the average power output of the insectA typical flying insect applies an average force equal to twice its weight during each downward stroke while hovering. estimate the average power output of the insect |

## Find the distance where the intensity level dropThe sound intensity of a whisper is 1.0x10^-10 W/m^2 at one meter distance from the source. At what distance does the intensity level drop by an additional 1dB |

## Calculate the diameter of the moons imageAn image of the moon is focused onto a screen using a converging lens of focal length f= 36.3 cm. The diameter of the moon is 3.48×106 m, What is the diameter of the moon's image |

## Determine the new period of oscillationA 89.0 kg skydiver hanging from a parachute bounces up and down with a period of 1.50 s. What is the new period of oscillation when a second skydiver |

## Find the tension between the barrel and sheenas handSheena pulls a sled along a snowy path on level ground with a maple syrup barrel, 26 kg, on the sled. find the tension between the barrel and Sheena's hand. |

## What is the mean free pathThe mean free path of a molecule in a gas is 280 nm. What is the mean free path if the gas temperature is tripled at constant volume?What is the mean free path if the gas temperature is tripled at constant pressure? |

## Evaluate the speed of the sphereA solid sphere is released from height h from the top of an incline making an angle ? with the horizontal. Calculate the speed of the sphere when it reaches the bottom of the incline in the case that it rolls without slipping |

## Calculate position-velocity-acceleration function of timeA particle of mass M is subjected to a force F(t) = kte-alphat, where k is a constant and alpha = 0.5 s-1. If the particle is initially at rest, calculate the position, velocity and acceleration as a function of time. |

## What is the frequency of the siren perceived by the observerAn ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. what is the frequency of the siren perceived by the observer |

## To what tension must a spider adjust a 14cm -long strandBiologists think that some spiders "tune" strands of their web to give enhanced response at frequencies corresponding to those at which desirable prey might struggle. |

## Calculate the maximum energy stored in the inductorA circuit consists of an idealized 191 mH in- ductor and a 25.4 µF capacitor. calculate the maximum energy stored in the inductor |

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