A brass bar twisted by torques T acting at the ends has the following properties: L 5 2.1 m, d 5 38 mm, and G 5 41 GPa. The torsional stiffness of the bar is approximately:
(A) 1200 N?m
(B) 2600 N?m
(C) 4000 N?m
(D) 4800 N?m
(C) 4000 N?m
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Simple Harmonic Motion: The position of an object that is oscillating on a spring is given by the equation x = (17.4 cm) cos[(5.46 s-1)t]. What is the angular frequency for this motion?
A. 0.183 rad/s B. 5.46 rad/s C. 2.34 rad/s D. 17.4 rad/s E. 0.869 rad/s
The velocity needed to stay in a round orbit is called the__________
A) circular velocity B) linear velocity C) vertical velocity D) horizontal velocity
Protostars are difficult to observe because
a. the protostar stage is very short.
b. they are surrounded by cocoons of gas and dust.
c. they radiate mainly in the infrared.
d. the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared.
e. they are all so far away that the light hasn't reached us yet.
A star system can become a Type I supernova several times
Indicate whether the statement is true or false