A 2.90-gram air inflated balloon is given an excess negative charge, q1 = -3.50 × 10-8 C, by rubbing it with a blanket. It is found that a charged rod can be held above the balloon at a distance of d = 7.80 cm to make the balloon float. In order for this to occur, what polarity of charge must the rod possess? How much charge, q2, does the rod have? Assume the balloon and rod to be point charges. The Coulomb force constant is 1/(4? ?0) = 8.99 × 10^9 N·m2/C2 and the acceleration due to gravity g = 9.81 m/s2.

Polling organization-parameter of interest : A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati.. |

Explain what is the speed of the second asteroid : What is the speed of the second asteroid? Now suppose that the first and second asteroids carry charges of 3.68 C and -3.68 C, respectively. How fast would the second asteroid have to be moving in order to occupy the same circular orbit as before? |

Determining confidence interval estimate : Sample with size n = 100 has mean = 30. Assuming the population standard deviation is 8, construct 95% confidence interval for population mean. |

What would be the weight of the spherical mass : What would be the weight of the spherical mass at that location? Round your answer to the nearest tenth decimal place and give your answer in the form "a.bc x 10^(y)" N. |

What polarity of charge should the rod possess : Assume the balloon and rod to be point charges. The Coulomb force constant is 1/(4? ?0) = 8.99 × 10^9 N·m2/C2 and the acceleration due to gravity g = 9.81 m/s2. |

Discussion on the best strategic plan : Discuss fully, the best strategic plan one of your employer's has (had) and the worst strategic plan one of your employer's has had. Do not name the organization, just use XYZ. |

Computing sample proportion : Suppose you conduct survey asking people if they support something or if they like some product or if they watch some TV-show. |

Complaining about harsher grading : one class of 40 students complain that they were harshly graded in the examination as l0 students received A or B ; 17 received a C ; and the rest received a D or lower. QUESTION: Is the class's complain about harsher grading justified? ( use a : 0.. |

What percentage of alpha particles penetrated completely : A physicist has developed a device that generates a beam of alpha particles (each of which is a helium nucleus, consisting of two protons, two neutrons, and no electrons). |

## Determine magnitude of acceleration of pilot at lowest pointA plate carries a charge of -3.9 µC, while a rod carries a charge of +2.2 µC. How many electrons should be transferred from the plate to the rod, so that both objects have the same charge. |

## Find the magnitude of the horizontal component of the planeA jetliner is moving at a speed of 187 m/s. The vertical component of the plane's velocity is 44.5 m/s. find out the magnitude of the horizontal component of the plane's velocity. |

## What is the frequency of sound heard by the driver of carA bucket filled with water has a mass of 48.00 kg and is attached to a rope that is wound around a 0.08 m radius cylinder. What torque does the bucket produce around the center of the cylinder. |

## Find the required angular speedAn alpha particle and beta^ {-} particle, each with kinetic energy 35 {rm keV}, are sent through a 1.10 {rm T} magnetic field. The particles move perpendicular to the field. Find the curvature radius for alpha particle's trajectory. Hint: The kine.. |

## Which makes pendulum swing upward in an arcA tsunami travelling across deep water can have the speed of 750 {rm km/h} and a wavelength of 360 km. what is the frequency. |

## By what percent- age does the moment of inertia decreaseSuppose you have a thin, uniform rod with a total mass of 3.00 kg and a total length of 2.00 m. By what percent- age does the moment of inertia decrease if you rotate it about a point located 20% (0.40 m) from one end, instead of at that end? |

## The distance between the two charges of the dipoleAssume you are the fish. You get up every morning and weigh yourself (in water), and find you weigh 0.42 N. You, being a boxfish, are a box measuring 4.164 cm per side. You see a poor, hungry fisherman, and decide to be his dinner. You hook yourself,.. |

## What is the bullet average accelerationA 30-06 bullet has a mass of 0.010 kg. If the average force on the bullet is 7200 N, what is the bullet's average acceleration? |

## Find magnitudes of the net magnetic fieldsThe drawing shows one horizontal wire with the current going up and one vertical wire with the current going to the right. Point A is dH to the right and dV above the intersection. Point B is dH to the left and dV below the intersection. |

## How many electrons need to leave each objectTwo spherical objects with a mass of 6.86 kg each are placed at a distance of 3.06 m apart. How many electrons need to leave each object so that the net force between them becomes zero? |

## What will be the lemmings speed upon landingA 400 g lemming (does anyone remember that old computer game?) waddles horizontally off a small 4.90 m high cliff with a speed of 0.5 ms-1.How far from the base of the cliff will the lemming land? What will be the lemmings speed upon landing. |

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