The displacement of a string carrying a traveling sinusoidal wave is given by
y(x, t) = ym sin(kx- ωt-φ) At time t = 0, the point at x = 0, has a velocity of 0 and a
positive displacement. The phase constant φ (in degree) is:
A. 90
B. 180
C. 270
D. 45
E. 0

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

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.)