A copper wire is stretched with a stress of 60 MPa at 20˚C. If the length is held constant, to what temperature must the wire be heated to reduce the stress to 5 MPa? The value of αl for copper is 17.0 × 10-6 (°C)-1, the modulus of elasticity is equal to 110 GPa.

Why is soap used to remove grease? a. its nonpolar end dissolves the grease. b. it makes the water bond with the grease. c. it chemically bonds with the grease. d. its polar end dissolves the grease.correct answer for apex - a, its nonpolar end dissolves the grease.

How have the greenhouse gasses increased from the year 2000 to 2018

What is the lowest number energy level where a d sublevel is found