A typical decibel level for a buzzing mosquito is 40 dB and normal conversation is approximately 50 dB. How many buzzing mosquitoes will produce a sound intensity equal to that of normal conversation?

Explain what is the cu2+ concentration : What is the Cu2+ concentration at 25*C in the cell Zn (s) I Zn2+ (1.0M) II Cu2+ (aq) I Cu(s)? The cell potential is 1.04 V. The standard cell potential is 1.10 V. |

Determine what is the mass of the bar : A uniform bar balances 26.6 cm from one end. When a 0.740 kg mass is hung from that end, What is the mass of the bar |

Find how long will it take to make next complete revolution : A 1.25kg- ball begins rolling from rest with constant angular acceleration down a hill. how long will it take to make the next complete revolution |

Explain what is avogadro''s number represent : What is avogadro's number represent. How many atoms of xenon are there in one mole of xenon |

Sound intensity equal to that of normal conversation : A typical decibel level for a buzzing mosquito is 40 dB and normal conversation is approximately 50 dB. How many buzzing mosquitoes will produce a sound intensity equal to that of normal conversation? |

Determine the magnitude and direction of the impulse : After a 0.250-kg rubber ball is dropped from a height of 1.80 m, it bounces off a concrete floor and rebounds to a height of 1.20 m. (a) Determine the magnitude and direction of the impulse delivered to the ball by the floor. magnitude? direction? |

Derive marginal productivity of capital : Determine whether the indicated products are competitive-complementary and derive marginal productivity of capital. |

Evaluate the struck balls velocity after the collision : A billiard ball moving at 6.00 m/s strikes a stationary ball of the same mass. find the struck ball's velocity after the collision |

Induced emf in the coil-induced current through the resistor : One hundred turns of insulated copper wire are wrapped around an iron core of cross-sectional area 0.100 m2. The circuit is completed by connecting the coil to a 10-ohms resistor. As the magnetic field along the coil axis changes from 1.00 T to 4... |

## Estimate its rotational kinetic energyA propeller is modeled as five identical uniform rods extending radially from its axis. The length and mass of each rod are 0.843 m and 2.83 kg, what is its rotational kinetic energy |

## What is the entropy change of the gasA 5.50-mol sample of H2 gas is contained in the left side of the container shown below, What is the entropy change of the gas |

## Obtain the magnitude of the maximum charge on one plateA capacitor is connected across an ac generator whose frequency is 753 Hz and whose peak output voltage is 140 V. What is the magnitude of the maximum charge on one plate of the capacitor |

## Calculate the magnitude of the force and the distancecalculate the magnitude of the force if Q1 is 4 x 10^-9 coulombs and Q2 is 8 x 10^-12 coulombs and the distance between them is 3 x 10^-8 meters. |

## Calculate the net rate of heat flow per secondYou have decided to make a large cooler to store meat. Calculate the net rate of heat flow per second out of the cooler if the interior temperature is 5 C and the exterior temperature can be 45 C |

## Find the maximum velocity of the surface of beating heartThe Doppler effect using ultrasonic waves of frequency 2.25×10^6 Hz is used to monitor the heartbeat of a fetus. find the maximum velocity of the surface of the beating heart |

## Estimate the magnitude of the acceleration on the massA mass of 7 kg lies on a frictionless, horizontal floor. A force of 110 Newtons is applied to the mass at an angle above the positive x axis, what is the magnitude of the acceleration on the mass |

## Find the average power performed by the craneA crane at a construction site lifts a concrete block with a mass of 440 kg from the ground to the top of a building with a height of 15.0 m, If the duration of the lift was 3.00 minutes, then what was the average power performed by the crane |

## What is the longest hole in one that the golfer can makeA golfer imparts a speed of 29.3 m/s to a ball, and it travels the maximum possible distance before landing on the green. What is the longest "hole in one" that the golfer can make, if the ball does not roll when it hits the green |

## Examine the velocity of the puck after the collisionAfter the collision, the 0.177 kg puck has a speed of 1.38 m/s at an angle of 27? to the positive x axis. Examine the velocity of the 0.302 kg puck after the collision. |

## What is the mass of the second blockA 3 kg block slides along a frictionless surface at 1.0 m/s. A second block, sliding at a faster 5.0 m/s, What is the mass of the second block |

## What is the induced emf between the wing tipsA boeing KC-135A airplane has a wingspan of 39.9 m and flies at a constant altitude in a northerly direction with a speed of 750 km/h. If the vertical component of the Earth's magnetic field is 5.2*10^-6 T, and its horizontal component is 1.5*10^-6 T.. |

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