Why were hot jupiters among the earliest known exoplanets?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Match each scenario to the form of energy it represents

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47