Which one of the following statements concerning Hooke's law is false? Select one:
a. Hooke's law can be applied to a wide range of materials.
b. Hooke's law is valid only within the elastic limit of a given material.
c. Hooke's law relates stress and strain.
d. Hooke's law can be verified experimentally.
e. Hooke's law is valid only for springs.

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

What is the magnitude of the acceleration vector which causes a particle to move from velocity −5i−2j m/s to −6i+ 7j m/s in 8 seconds. answer in m/s.

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.