A large bouncy ball with a mass of 209 g is dropped straight down and then bounces back up to a height that is slightly lower than the point from which it was dropped. The ball hits the floor 0.65 s after it is released and the ball is in contact with the floor for 0.080 s during the bounce. The momentum of the ball right before it hits the floor is 1.3 kg.m/s, down. The momentum of the ball right after it leaves the floor is 1.1 kg.m/s, up.

Determine the magnitude of the average net force exerted on the ball while it is in contact with the floor.

What is the magnitude of the average force that the floor exerts on the ball?

Find dimensions of fin that achieve a maximum efficiency : Fins are used to enhance the cooling of an object. Fins are manufactured in a wide variety of shapes and sizes, and for a mass-product, it may be beneficial to optimize the shape of the fin. find the dimensions of the fin that achieve a maximum |

How much does the thermal energy of the system increase : Megan is sitting (at rest) at the top of a slide that is inclined 25o with respect to the horizontal. how much does the thermal energy of the system increase during Megan's trip down the slide |

Explain how many grams of copper in copper ore : A copper ore is 23.5% copper by mass. How many grams of copper are in 250.0 grams of this copper ore |

What is the number of bits required to achieve resolution : An absolute encoder is to be used for measurements that require a minimum resolution of 0.05 minute or arc. What is the number of bits required to achieve the specified resolution |

Compute the magnitude of the average force : A large bouncy ball with a mass of 209 g is dropped straight down and then bounces back up to a height that is slightly lower than the point from which it was dropped. compute the magnitude of the average force that the floor exerts on the ball |

Specify the value of vg at which the device changes modes : A PMOS transistor has Vtp = -0.5V. As the gate voltage vG is varied from +2.5V to 0V, the transistor moves through all of its three possible modes of operation. Specify the value of vG at which the device changes modes of operation. |

How much will the perpetuity pay every year : A perpetuity has a PV of $32,000. If the interest rate is 10%, how much will the perpetuity pay every year? |

What is the capital gain rate for this transaction : a stock is bought for $22.00 and sold for $26.00 one year later, immediately after it has paid a didvidend of $1.50. What is the capital gain rate for this transaction? |

Find the phase currents in the balanced wye load : In a balanced 3 phase system, the source is a balanced wye with an abc-phase sequence and Vab = 208 |

## What is intensity delivered to the eardrumA person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 29.7 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.10 10-11 W/m2. What is intensity delivered to t.. |

## Find the length of the drivewayA pilot wants to fly due north a distance of 125 km. The wind is blowing out of the west at a constant 35 km/h. If the plane travel at 175 km/h, how long would the trip take. |

## Determine the charge on each sphereA student suspends two identical conductive spheres (m = 0.30g) from two equally long nylon threads each 25 cm long, What is the charge on each sphere |

## Find the separation between the two sourcesFind the time it takes for a telephone call to go by way of satellite between these cities. Ignore the curvature of the earth. |

## Determine the rms voltage of the sourceIn an L-R-C series circuit, the rms voltage across the resistor is 31.7V , across the capacitor it is 89.2V, What is the rms voltage of the source |

## What is your sister''s massYou do 116 J of work while pulling your sister back on a swing, whose chain is 5.0m long, until the swing makes an angle of 32.0° with the vertical |

## Determine the internal resistance of the batteryA 1.57-? resistor is connected across a 6.90-V battery. The voltage between the terminals of the battery is observed to be only 6.30 V |

## What is the average rate at which energy is transmittedOn a workday the average decibel level of a busy street is 69 dB, with 102 cars passing a given point every minute. If the number of cars is condensed to 39 cars every minute on a weekend, what is the decibel level of street. |

## How far from the starting point is the hikerShow that the horizontal resultant of these two forces on the lamp is zero. Work out the weight of the lamp. |

## Safety standards, bags produce a maximum accelerationBoth car A and car B leave school at the same time, traveling in the same direction. Car A travels at a constant speed of 71 km/h while car B travels at a constant speed of 90 km/h. how faris car A from school 2.2 h later. |

## What happen if the plane now turns and heads for homeA crate of mass 10.3 kg is pulled up a rough incline with an initial speed of 1.51m/s. The pulling force is 97N parallel to the incline, which makes an angle of 20.3 ° with horizontal. The coefficient of kinetic friction is 0.400, and the crate is.. |

## What is canoes speed just after she jumpsA potter's wheel having a radius 0.55m and a moment of inertia 12.5 kg·m2 is rotating freely at 55rev/min. The potter can stop the wheel in 6s by pressing a wet rag against the rim and exerting a radially inward force of 68 N. |

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