The star Procyon B has a surface temperature of 7,500°C and a low
absolute brightness. What type of star is it?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.

What happens when a rubber rod is rubbed with a piece of fur?