The speed of light in a vacuum is 300 000 000m/s. The speed of light in Diamond is 124 000 000 m/s. Calculate the refractive index of diamond.

The step-down transformer gives a current of 10a at 24v if the primary voltage is 240v calculate the 1_primary current 2_the power input 3_the power output

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

Can anybody me with this? ? (picture included.)