Which of the following four objects has the greatest kinetic energy?
a. An object of mass m moving with speed 4v
b. An object of mass 3m moving with speed 2v
c. An object of mass 4m moving with speed v
d. An object of mass 2m moving with speed 3v
e. None of these; all four objects have the same kinetic energy.
d
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The graphs below show the phasors ?Vmax and Imax for five RLC series circuits. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax. Which graph represents a circuit where the inductive reactance is greater than the capacitive reactance?
a.
b.
c.
To hold a 5 lb bag of sugar in your hand, you must push upwards on it with a force of 5 lb. This is an example of Newton's third law
Indicate whether the statement is true or false
Which of the following best describes the evolutionary track of the most massive stars?
A) vertically left, then straight down B) horizontal right C) horizontal right, then a clockwise loop D) diagonally to lower right, then vertical, then horizontal left E) horizontally right, diagonal to lower left, then horizontal right
Material 1 has Young's modulus Y1 and density ?1, and material 2 has Young's modulus Y2 and density ?2 . If Y1 is 30% more than Y2 and ?1 is 30% less than ?2, which material has the higher speed of sound and how much higher is it?
a. Material 1 has a speed of sound more than 35% higher than material 2 b. Material 1 has a speed of sound 30% higher than material 2. c. Material 2 has a speed of sound more than 80% higher than material 1 d. Material 2 has a speed of sound 30% higher than material 1.