A spring has a natural length of 12 cm. If a 25-N force is required to keep it stretched to a length of 28 cm, how much work W is required to stretch it from 12 cm to 20 cm

According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring

Ball bearings are made by letting spherical drops of molten metal fall inside a talll tower-called a shot tower- and solidify as they fall. a-if a bearing needs 4.0 s to solidify enough for impact, how high must the tower be? b- what is the bearing's impact velocity?

What opposes motion between surfaces that are touching