# Posts by devika

Total # Posts: 10

**Physics**

1. A 1200 kg car moves along a horizontal road at speed v0 = 20.1 m/s. The road is wet, so the static friction coefficient between the tires and the road is only ?s = 0.189 and the kinetic friction coefficient is even lower, ?k = 0.1323. The acceleration of gravity is 9.8 m/s^...

**physics**

A train is moving with an initial velocity of 30 m/s the breaks are applied so as to produce uniform acceleration of minus 1.5m/s Calculate the time in which it will come to rest

**English**

I went to buy a DVD but The shop didn't have it.

**English**

I went to buy a DVD.The shop didn't have it.

**English**

I went to buy a DVD.THE shop didn't have it.

**Math**

What is the explicit form of the following sequence: 1.5, 3.6, 4.2, 5.4, 7.9, 8.3, 8.6, 9.7

**Statistics**

Why do we use Z score to build on confidence intervals rather than t score?

**Statistics**

You are getting ready to take a sample from a large population, and need to determine the appropriate sample size. You are estimating sales at a large chain of department stores. A previous survey from the same population found a standard deviation of $18. What sample size is ...

**statistics**

A random sample of size 81 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 43 minutes, and the sample standard deviation 5.71 minutes. Construct a 95% confidence interval around the ...

**Math**

need help