Astronauts use a centrifuge to simulate the acceleration of a rocket launch. The centrifuge takes 20.0s to speed up from rest to its top speed of 1 rotation every 1.20s . The astronaut is strapped into a seat 4.60m from the axis.

What is the astronaut's tangential acceleration during the first 20.0s?

How many g's of acceleration does the astronaut experience when the device is rotating at top speed? Each 9.80m/s2 of acceleration is 1 g.

State the concentration of the sodium ion in a solution : What is the concentration of the sodium ion (in M) in a solution of 0.681 M sodium chloride |

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Early modern period by historians : The era from 1500 – 1750 is often labeled the Early Modern Period by historians. Discuss the elements (political, economic, social/cultural, intellectual, etc) of this period that lay the foundations for the modern world or today’s society. Use speci.. |

Determine the short run and long run impact of events : a. An epidemic decreases the amount of labor by 10%. b. A domestic campaign has a strong success on increasing the MPS and decreasing the population growth rate. |

Determine the astronauts tangential acceleration : Astronauts use a centrifuge to simulate the acceleration of a rocket launch, What is the astronaut's tangential acceleration during the first 20.0s |

Find out the bimolecular rate constant of a reaction : Determine the bimolecular (second order) rate constant of a reaction if the initial reagent concentration decreases from 4.6900 mol/L, to 0.59400 mol/L in 13.00 seconds. |

Why do economists pay little attention to the algebraic sign : Why do economists pay little attention to the algebraic sign of the elasticity of demand for a good with respect to its own price, yet pay careful attention to the algebraic sign of the elasticity of the demand for a good with respect to another g.. |

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Explain what is the hypothesis testing conclusion : A study by the centers of disease control (CDC) found that 23.3% of smokers are adults and that roughly 70% of those who do smoke indicate that they want to quit (Associated Press, July 26, 2002). |

## Compute the de broglie wavelength of each particleAn electron and a proton each have a thermal kinetic energy of 3×kBT/2. Compute the de Broglie wavelength of each particle at the temperature of 2050 K. (kb is Boltzmann's constant, 1.38×10-23 J/K). |

## What is the spring constant of each springWhat is the spring constant of each spring if the empty car bounces up and down 1.4 times each second? |

## A second capacitor c has a plate separation of 4.5 mmA capacitor C stores charge Q when there is a potential difference V. When a potential difference of V + 12.5Volts is used, an extra 45.50 microC of charge is stored. What is the capacitance C. |

## What is the minimum thickness of film requiredA thin film of polystyrene is used as an antireflective coating for fabulite, What is the minimum thickness of film required, Assume that the wavelength of the light in air is 510 nanometers |

## Find the average kinetic energy of a helium atom7.5 mol of helium are in a 18 L cylinder. The pressure gauge on the cylinder reads 67psi, What are the temperature of the gas in Celsius and the average kinetic energy of a helium atom |

## What is the maximum height reached by rocketA model rocket is launched straight upward with an initial speed of 47.8m/s. It accelerates with a constant upward acceleration of 2.07m/s2 until its engines stop at an altitude of 157 m. What is the maximum height reached by rocket. |

## What is the acceleration of the elevatorThe two upper front teeth of a person exert a total force of 30N on a piece of steak. If the biting edge of each tooth measures 10 mm x 1 mm, find out the pressure on the steak. |

## What would be the ratio of the powers in the circuitsTwo circuits contain an emf produced by a moving metal rod, like that shown. The speed of the rod is the same in each circuit, other than the bulb in circuit 1 has one-half the resistance of the bulb in circuit 2. |

## How much power is dissipated in cordTwo charged spheres are 19 cm apart. They are moved, and the force on each of them is found to have been quadrupled. How far apart are they now. |

## What is the new coefficient of frictionIn outer space, far from other objects, block 1 of mass 30 kg is at position m, and block 2 of mass 1350 kg is at position m. What is the (vector) gravitational force acting on block 2 because of block 1? It helps to make a sketch of the situatio.. |

## What is the escape speedAn electron is at rest just above the surface of a sphere with the radius of 1.90 mm and a uniformly distributed positive charge of 2.1 x10-15 C. |

## What is the electrostatic force on the negative chargeTwo balls with a net charge of - 4.0 C and + 10.0 C are separated by 2 cm. A) What is the electrostatic force on the positive charge? B) What is the electrostatic force on the negative charge? |

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