In which one of the following locations can a person hear the echo of a sound?
a. at least 33.2 meters behind the reflecting surface
b. less than 16.6 meters in front of the reflecting surface
c. less than 33.2 meters behind the reflecting surface
d. at least 16.6 meters in front of the reflecting surface

When does your body conduct current more readily?

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)