What is the process of accretion?
A) the separation of materials in a protoplanet by density, with dense material in core
B) growth of an object by the accumulation of matter
C) the breakup of large objects by violent collisions with other similar-sized objects
D) the period of time during which the Sun swept away all the excess material in the solar nebula
E) the process by which the solar nebula became heated during its collapse
B
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A 750 N box rests on a floor with a coefficient of static friction = 0.800 and coefficient of kinetic friction = 0.600. What is the force of friction if a horizontal force of 550 N is applied to the box?
A. 600 N B. 450 N C. 750 N D. 550 N E. 440 N
A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery (a) the voltage across the capacitor is
A) equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. (b) the voltage across the resistor is A) equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. What will be an ideal response?
In South Africa, it's usually quite warm around the time of the December solstice and quite cool around the time of the June solstice
Indicate whether the statement is true or false
A centrifuge rotates at 100 rev/s (i.e., 628 rad/s). If the test tube places the suspension at 10 cm from the axis of rotation, by what factor are the terminal speeds of the settling particles increased as compared to sedimentation cause by gravity?
a. 3.2 × 10^3 c. 800 b. 64 d. 4.0 × 10^4