a)1 mN

b)4 mN

c)0.5 mN

d)0.25 mN

geduiwelh
2021-02-25
Answered

Two parallel wirescarrying equal currents of 10 A attract each other with a force of1 mN. If both currents are doubled, the force of attraction willbe:

a)1 mN

b)4 mN

c)0.5 mN

d)0.25 mN

a)1 mN

b)4 mN

c)0.5 mN

d)0.25 mN

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joshyoung05M

Answered 2021-02-26
Author has **97** answers

b)4mN

asked 2020-11-22

The specific heat of lead is 0.030 cal/g.C. 300 grams of leadshot at 100C is mixed with 100 grams of water at 70C in an insulated container. The final temperature of the mixture is:

A) 100C

b) 85.5C

c)79.5C

d) 74.5C

e)72.5C

A) 100C

b) 85.5C

c)79.5C

d) 74.5C

e)72.5C

asked 2021-08-17

Jones figures that the total number of thousands of miles that a used auto can be driven before it would need to be junked is an exponential random variable with parameter

Smith has a used car that he claims has been driven only 10,000 miles.

If Jones purchases the car, what is the probability that she would get at least 20,000 additional miles out of it?

Repeat under the assumption that the lifetime mileage of the car is not exponentially distributed but rather is (in thousands of miles) uniformly distributed over (0, 40).

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 2021-03-26

A pair of forces with equal magnitudes, opposite directions,and different lines of action is called a "couple". When acouple acts on a rigid object, the couple produces a torque thatdoes not depend on the location of the axis. The drawing shows acouple acting on a tire wrench, each force being perpendicular tothe wrench. Determine an expression for the torque produced by thecouple when the axis is perpendicular to the tired and passesthrough (a) point A, (b) point B, and (c) point C. Express youranswers in terms of the magnitude F of the force and the length Lof the wrench

asked 2021-08-15

To find the lowest term of the given ration, D's to A's.

${D}^{\prime}s=3$ and ${A}^{\prime}s=6$

asked 2022-06-20

Hypothesis testing, inference of means

A student in a class randomly selected 25 weekdays and timed how long the 8am bus took to travel from home to school. His data gave an average travel time of 37 minutes and standard deviation of 2.5 minutes.

(a) Use the student's data to construct a 90% confidence interval for the true mean travel time from home to school for the 8am bus on weekdays. Also interpret the confidence interval in the context of this question.

(b) Do the student's data provided sufficient evidence that the true mean travel time is longer than 35 minutes? Carry out an appropriate hypothesis test at the 10% significance level.

I got no problem with (a) its 37+/- 1.711/2. However for (b), while the test statistic using the t-test gives me 4. the answer shows that the alpha value is 0.005 which makes no sense to me as I believe it should be 0.10 since its a one-tailed test.

Hope someone could find the problem here? Am I wrong or the answer is wrong?

A student in a class randomly selected 25 weekdays and timed how long the 8am bus took to travel from home to school. His data gave an average travel time of 37 minutes and standard deviation of 2.5 minutes.

(a) Use the student's data to construct a 90% confidence interval for the true mean travel time from home to school for the 8am bus on weekdays. Also interpret the confidence interval in the context of this question.

(b) Do the student's data provided sufficient evidence that the true mean travel time is longer than 35 minutes? Carry out an appropriate hypothesis test at the 10% significance level.

I got no problem with (a) its 37+/- 1.711/2. However for (b), while the test statistic using the t-test gives me 4. the answer shows that the alpha value is 0.005 which makes no sense to me as I believe it should be 0.10 since its a one-tailed test.

Hope someone could find the problem here? Am I wrong or the answer is wrong?

asked 2021-11-27

State the number of possible triangles that can be formed using the given measurements