The discovery of cosmic microwave background radiation and primordial helium gas was scientific evidence supporting the
big bang theory
nebular theory
steady state theory
oscillating universe theory

If vx = 7.00 units and vy = -7.60 units, determine the magnitude of v⃗ . determine the direction of v⃗ .

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

What sort of waves exhibit the doppler effect?