An alternating emf source with a variable frequency fd is connected in series with an 80.0 B resistor and a 40.0 mH inductor. The emf amplitude is 6.00 V. (a) Draw a phasor diagram for phasor VR (the potential across the resistor) and phasor VL (the potential across the inductor). (b) At what driving frequency fd do the two phasors have the same length? At that driving frequency, what are (c) the phase angle in degrees, (d) the angular speed at which the phasors rotate, and (e) the current amplitude?

Production-volume variance : Using the above data, fill in the following blanks with the variance amounts. Use F for favorable or U for unfavorable for each variance. Total Overhead Variable Fixed, 1. Spending variance , 2. Efficiency variance ?, 3. Production-volume variance ?,.. |

Illustrate what power must a motor have to perform this task : How much work is required to pull him 75 m up a 30° slope (assumed frictionless) at a constant speed of 2.1 m/s? Your response differs from the correct answer by more than 10%. Double check your calculations. Illustrate what power must a motor have t.. |

What is the specific heat of this substance : The molar heat capacity of a compound with the formula C2H6SO is 88.0 J/mol-K. what is the specific heat of this substance. |

Which species exhibits most parental care of young offspring : Which species exhibits the most parental care of young offspring? |

At what driving frequency fd do two phasors have same length : At what driving frequency fd do two phasors have the same length? At that driving frequency, what are (c) the phase angle in degrees, (d) the angular speed at which the phasors rotate, and (e) the current amplitude? |

How much energy is released during the complete combustion : The heat of combustion of cyclobutane is 650.3 kcal/mol. How much energy is released during the complete combustion of 450 grams of cyclobutane. |

Explain evidence and graph to support consumer-s conjecture : A sample of 8 jars has a mean of 15.6 ounces and a standard deviation of 0.3 ounce. Is there enough evidence to support the consumer's conjecture at a = 0.05 and how can this be graphed? |

What kind of molecule is likeliest to act as an anesthetic : What kind of molecule is likeliest to act as an anesthetic in mammals? |

Illustrate what is the magnitude of the football resultant : At this point, he throws a 39 yard forward pass straight down the field. Illustrate what is the magnitude of the football's resultant displacement? |

## Find the speed at which it hits the groundTwo identical aluminium objects are insulated from their surroundings. Object A has a net charge of excess electrons. Object B is grounded. Which object is at the higher potential. |

## Find the temperature of the blob of ironA blob of iron sinks form the surface of earth to the center. Assume the blob does not transfer any energy to its surroundings. Assume the density of earth is uniform. |

## What is the mechanical energy lost due to frictionA sledge loaded with bricks has a total mass of 17.8 kg and is pulled at constant speed by the rope inclined at 20.4° above the horizontal. The sledge moves a distance of 20.7 m on a horizontal surface. The coefficient of kinetic friction between .. |

## What is the initial velocity of the cranberry juiceA ball is thrown upward from the ground with an initial speed of 23.90 m/s; at = same instant, a ball is dropped from a building 16 m high. After how long will the balls be at the same height. |

## What angle would the pitch have to be thrown(a) What must the initial speed of the ball be if the pitch is to arrive at the batter exactly 1.00 m above the ground? (b) How long does it take the ball to reach the batter? (c) If there were no gravity, at what angle would the pitch have to be .. |

## What is the maximum head-start distancewhat is the maximum head-start distance the speeder can have? Measure time from the moment the police car starts. |

## Why maximum kinetic energy of cart be equal to potentialFor the motion along the inclined plane, should the maximum kinetic energy of the cart be equal to the potential energy of the compressed spring (under ideal conditions)? |

## How far does the train move duringA train is traveling down a straight track at 29 m/s when the engineer applies the brakes, resulting in an acceleration of 1.0 m/s2 as long as the train is in motion. How far does the train move during a 58-s time interval starting at the instant .. |

## What is the magnitude and direction of the accelerationA block of weight 36.1 N is hanging from a rope. The tension in the rope is 48.5 N, pulling upward on the block. What is the magnitude and direction of the acceleration of the block? |

## What are the distances of these three points from speaker aSpeakers A and B are vibrating in phase. They are directly facing each other, are 8.0 m apart, and are each playing a 76.0-Hz tone. The speed of sound is 343 m/s. On the line between the speakers there are three points where constructive interfere.. |

## What is the decibel level of streetOn a workday the average decibel level of a busy street is 72.0 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 50 every minute on a weekend, what is the decibel level of street. |

## How high is the buildingThe person in the middle weighs 190 N, and the tensions in each rope are 200-N. What is the weight of the staging. |

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