socorraob
2021-12-18
Answered

You live on a busy street, but as a music lover, you want to reduce the traffic noise. (a) If you install special sound-reflecting windows that reduce the sound intensity level (in dB) by 30 dB, by what fraction have you lowered the sound intensity (in W/m2)? (b) If, instead, you reduce the intensity by half, what change (in dB) do you make in the sound intensity level?

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asked 2021-04-26

An elevator (mass 4850 kg) is to be designed so that themaximum acceleration is 0.0600g. What is the maximum and the minimum forces the motor should exert on the supportingcable?

I already know how to find the maximum force (just multiplyingthe maximum acceleration by the mass), but I've got no clue as tohow to find the minimum acceleration when no minimum accelerationhas been found.

I already know how to find the maximum force (just multiplyingthe maximum acceleration by the mass), but I've got no clue as tohow to find the minimum acceleration when no minimum accelerationhas been found.

asked 2020-10-28

A stone hangs by a fine thread from the ceiling,and a section of the same thread dangles from the bottom of the stone.If a person gives a sharp pull on the dangling thread,where is the thread likely to break:below the stone or above it?

asked 2020-12-05

A 5.00kg sack of flour is lifted vertically at a constant speed of 3.50m/s through a height of 15.0m. a) How great a force is required? b) How much work is done on the sack by the lifting force? What becomes of this work?

asked 2020-11-23

Saturn has an equatorial radius of 6.00 107 mand a mass of 5.67 1026 kg.

(a) Compute the acceleration of gravity at the equatorof Saturn.

(b) What it the ratio of a person's weight on Saturn to that onEarth?

(a) Compute the acceleration of gravity at the equatorof Saturn.

(b) What it the ratio of a person's weight on Saturn to that onEarth?

asked 2021-05-06

A fishing pole is 2.00 m long and inclined to the horizontal at an angle of

asked 2020-12-17

Consider the circuit in the drawing.

Determine:

(a) the magnitude of the current in the circuit.

(b) the magnitude of the voltage between the points labeled A and B.

(c) State which point, A or B, is at the higher potential.

asked 2022-01-17

What is a residual? What does it mean when a residual is positive?

Choose the correct answer below.

A. a residual is the difference between an observed value of the response variable y and the average value of the response variable. If it is positive, then the response variable is greater than the mean.

B. A residual is the difference between an observed value of the response variable y and the predicted value of y. If it ispositive, then the observed value is greater than the predicted value.

C. A residual is the difference between an observed value of the response variable y and the value of the corresponding explanatory variable x. If it is positive, then the response variable is greater than the explanatory variable.

D. A residual is a data point that does not fit the pattern of the rest of the data. If it is positive, then the data point should still be included in the data set.

Choose the correct answer below.

A. a residual is the difference between an observed value of the response variable y and the average value of the response variable. If it is positive, then the response variable is greater than the mean.

B. A residual is the difference between an observed value of the response variable y and the predicted value of y. If it ispositive, then the observed value is greater than the predicted value.

C. A residual is the difference between an observed value of the response variable y and the value of the corresponding explanatory variable x. If it is positive, then the response variable is greater than the explanatory variable.

D. A residual is a data point that does not fit the pattern of the rest of the data. If it is positive, then the data point should still be included in the data set.