The SI unit of pressure is the pascal
Indicate whether the statement is true or false
T
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Molecular clouds are much warmer than typical interstellar gas clouds
Indicate whether the statement is true or false
A threaded steel rod (Es 5 210 GPa, dr 5 15 mm, ctes 5 12 3 1026/°C) is held stress-free between rigid walls by a nut and washer (dw 5 22 mm) assembly at each end. If the allowable bearing stress between the washer and wall is 55 MPa and the allowable normal stress in the rod is 90 MPa, the maximum permissible temperature drop ?T is approximately:
(A) 25 8C
(B) 30 8C
(C) 38 8C
(D) 46 8C
While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 watts during a race, how fast is the person running? Assume a running step is 1.5 m long.
What will be an ideal response?
Which of the following is NOT an ion?
A) H+1 B) Br- C) O2 D) Mg+2 E) NO3-