To pull a 30 kg crate across a horizontal frictionless floor, a worker applies a force of 190 N, directed 20° above the horizontal. The crate moves 3.0 m. (a) What work is done on the crate by the worker's force? (b) What work is done on the crate by its own weight? (c) What work is done on the crate by the normal force exerted by the floor on the crate? (d) What is the total work done on the crate?

Determine the radius of curvature of p of the turn : An airplane, traveling at a constant speed of 50 m/s, is executing a horizontal turn. if the plane is banked at theta = degrees, when the pilot experiences only a normal force on the seat of the plane, determine the radius of curvature of p of the tu.. |

Power is required of force motor exerts on cab via cable : A fully loaded, slow-moving freight elevator has a cab with a total mass of 1150 kg, which is required to travel upward 49 m in 3.1 min, starting and ending at rest. The elevator's counterweight has a mass of only 1025 kg, and so the elevator motor m.. |

Other forces also act on the particle : Force on a Particle A force F = (4.0 N)i + (c N)j acts on a particle as the particle goes through displacement d = (4.0 m)i - (2.0 m)j. (Other forces also act on the particle.) What is the value of c if the work done on the particle by force F is eac.. |

What is the tension in the string : You whirl a 0.50 kg rock on a string over your head. It takes 1.0 second for the rock to make a complete revolution. The string is 1.5 m long. What is the velocity of the rock, What is the centripetal acceleration of the rock, What is the tension in .. |

What work is done on the crate by the workers force : To pull a 30 kg crate across a horizontal frictionless floor, a worker applies a force of 190 N, directed 20° above the horizontal. The crate moves 3.0 m. (a) What work is done on the crate by the worker's force? (b) What work is done on the crate by.. |

Will promptly rate any acceptable response as a life saver : Write a brief description (1-3 paragraphs) of the Saint Venant equations (words only, no equations) comparing them to the Navier-Stokes equations, emphasizing the ASSUMPTIONS on which they are based. |

The description should include a brief history : Write a brief (No more than a few paragraphs plus the equations themselves on a) description of the three-dimensional unsteady Navier-Stokes equations as applied to water. The description should include a brief history |

Determine the dynamic viscosity of glycerin at 85 degrees : Two parallel plates, one moving at 4m/s and the other fixed, are seperated by a 5mm thick layer of oil of specific gravity 0.80 and kinematic viscocity 1.25 X 10^-4 m2/s. What is the average shear stress in the oil? |

Classify the soils using the given grain size distribution : Classify the following soils using the given grain size distribution (ASTM system) and Atterberg Limits data: |

## Obtain the mass of the aluminum cupAn aluminum cup contains 225 g of water and a 40 g copper stirrer, all at 27°C. A 490 g sample of silver at an initial temperature of 90°C is placed in the water. Calculate the mass of the aluminum cup |

## How long does it take to stop after the power is turned offWhen the power is turned off on a turntable spinning at 78.0 rpm , you find that it takes 10.5 revolutions for it to stop while slowing down at a uniform rate. How long does it take to stop after the power is turned off |

## Determine the ratio of the heat lostA skier wears a jacket filled with goose down that is 15 mm thick. Another skier wears a wool sweater that is 7.00 mm thick. Both have same surface area. |

## Neglecting friction-find childs speed at the lowest positionA 29.0 kg child on a 1.00 m long swing is released from rest when the ropes of the swing make an angle of 31.0° with the vertical. Neglecting friction, find the child's speed at the lowest position. |

## What is the net torque on the systemA 4.50 kg counterweight is attached to a light cord, which is wound around a spool. The spool is a uniform solid cylinder of radius 6.00 cm and mass 1.80 kg. What is the net torque on the system about the point O |

## What is the oscillation frequency of the two-block systemIn a period of 1.0 s, 5.0 x10^23 nitrogen molecules strike a wall of area 7.80 cm2. If the molecules move at 270 m/s and strike wall head on in a perfectly elastic collision, find the pressure exerted on the wall. (The mass of one N2 molecule is 4.. |

## Determine the rms speed of heliumA cylinder contains a mixture of helium and argon gas in equilibrium at a temperature of 240 C. Boltzmann's constant is 1.38066 × 10?23 J/K, What is the rms speed of helium |

## Evaluate the satellites speedA satellite is in a 95.0 min period circular orbit 380km above Earth's surface. Find the satellite's speed |

## What is the time of maximum height of the projectileA projectile is projected from the origin with a velocity of 25.0 m/s at an angle of 50.0 degrees above the horizontal. What is the time of maximum height of the projectile? A.)2.03 s B.)3.45 s C.)1.95 s D.)2.67 s E.)3.01 s |

## Illustrate what does the scale read during the accelerationStarting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9300 N. Illustrate what does the scale read during the acceleration? |

## How much time elapses before the apple hits the groundA 111 gram apple falls from a branch that is 3.5 meters above the ground, How much time elapses before the apple hits the ground |

## Determine the change in length of the rodAn aluminum rod is 24.0 cm long at 20°C and has a mass of 350 g. If 13,500 J of energy is added to the rod by heat, what is the change in length of the rod |

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