(1) A 1.5 m^3-volume tank holds oxygen gas (M = 32 g/mole) at the pressure of 500,000 Pa. The temperature is 27 C. Find the mass of oxygen in the tank (in kg).

(2) A ice chest is maintained at 0 C by ice placed in it. The chest has a total surface area of 600 cm2 and a thickness of

1 cm. The wall of the ice chest is of Styrofoam with thermal conductivity k = 2.3 *10^-4 cal/(cm s C). How much ice

will melt in the chest in 4 hours when the outside temperature is 20 C (in g)?

Define what is the partial pressure of helium : Three gases, nitrogen, helium, and krypton are confined in a 9.00 L vessel at a pressure of 7.00 atm. The vessel contains 5.00 moles of nitrogen, 2.00 moles of helium, and 2.00 moles of krypton. What is the partial pressure of helium |

What is the average density of the block : A wood block floats on water with 35% of its volume above the surface (of water), what is the average density of the block (in kg/m3) |

What is the maximum velocity of the photoelectrons emitted : A photoelectric surface has a work function of 4eV. What is the maximum velocity of the photoelectrons emitted by light if frequency 10^15 Hz incident on the surface h = 6.6 * 10^-34 Joules-second e = 1.6 * 10^-19 Coulomb |

What is the angular frequency of the oscillation : A simple pendulum consists of a 4kg mass attached to a 3m long rope. At t=0 it is moving to the right at 0.4m/s. What is the angular frequency of the oscillation |

Find the mass of oxygen in the tank : A 1.5 m^3-volume tank holds oxygen gas (M = 32 g/mole) at the pressure of 500,000 Pa. The temperature is 27 C. Find the mass of oxygen in the tank (in kg) |

Nitrogen gas may react with hydrogen gas to form hydrazine : Nitrogen gas may react with hydrogen gas to form hydrazine gas, N2H4, according to the reaction N2 + 2 H2 ---> N2H4. 10 L of N and 25 L H react to completion (the limiting reagent is converted entirely to hydrazine). |

What observations were puzzling at first : What observations were puzzling at first, that challenged your initial hunch of what you thought you would find and what further questions have your observations proposed? |

What is the daily interest savings of the system : Sherman's Sherbet currently takes about 10 days to collect and deposit checks from customers. A lock-box system could reduce this time to 6 days. Collections average $35,000 daily. The interest rate is .02% per day. |

Calculate the standard deviation of expected returns : Calculate the standard deviation of expected returns, ?X, for Stock X (?Y = 19.83%.) Round your answer to two decimal places. |

## What is the gravitational feild and potential3 Mass points each of mass m are placed at the vertices of an equilateral triangle of side l. What is the gravitational feild and potential due to 3 masses |

## What were initial charges on the spheresTwo identical conducting spheres, fixed in place, attract each other with an electrostatic force of -0.6020 N when separated by 50 cm, center-to-center. |

## What vector force does it then exert on aA charged particle A exerts a force of 2.69 ?N to the right on charged particle B, when the particles are 14.0 mm apart. Particle B moves straight away from A to make the distance between them 17.0 mm. What vector force does it then exert on A? |

## How fast a simple generator produce peak outputA tuning fork vibrating at 516 Hz falls from rest and accelerates at 9.80 m/s2. How far below the point of release is the tuning fork while waves with a frequency of 489 Hz reach the release point? Take the speed of sound in air to be 340 m/s. |

## Determine the work done by the ropes forceA rope is used to pull a 2.25 kg block at constant speed 7.47 m along a horizontal floor. The force on the block from the rope is 7.52 N, find the work done by the rope's force |

## Describe the shape of the distribution of sample meansexplain the shape of the distribution of sample means. |

## What are the new frequencies of these three modesIf the string is 9.5 m long, has a mass of 45 g and is pulled taut with the tension of 8.0 N, how much time does it take for a wave to travel from one end of the string to the other. |

## Assume the left is positive, the right is negative chargeCharge q is fired through a small hole in the positive plate of a capacitor. If q is a positive charge, does it speed up or slow down inside the capacitor? reply this question using the concept of force. |

## What is the potential difference across the three resistorsThree resistors, 23, 45, and 73 ?, are connected in series, and a 0.55-A current passes through them. (a) What is the equivalent resistance? (b) What is the potential difference across the three resistors? |

## What is the size of the induced current in the loopA 10 μF capacitor is charged to 15 V. It is next connected in series with an uncharged 5.00-μF capacitor. The series combination is finally connected across a 50.0-V battery, as diagrammed. Find out the new potential differences across the 5-μF an.. |

## Determine the minimum current needed to levitate the wireA current-carrying wire passes through a region of space that has a uniform magnetic field of 0.76 T. determine the minimum current needed to levitate the wire |

## What is the area of the leafGold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber, If a sample of gold with a mass of 2.477g, is pressed into a leaf of 4.116 ?m thickness, what is the area (in m2).. |

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