Which of the following types of research is conducted on multiple occasions over time? A.
experimental
B.
longitudinal
C.
representative
D.
cross-sectional

Please select the best answer from the choices provided

A
B
C
D

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

What efficiency of a car's engine when heat input is 200,000 joules and waste heat is 150,000 joules? a. 75% b. 35% c. 25% d. 85%

The unit of resistivity is the: ohm ohm-cm volt coulomb