A force of 20 N is applied to extend a horizontal spring by 5 cm. What is the spring constant?
A: 4 N/cm
B: 0.25 N/cm
C: 100 N/cm
D: 25 N/cm

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.

When an object is heated it contracts. a. true b. false

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.