What is one reason that early life formed cells?
A) cell walls prevent heat from escaping
B) cells concentrate molecules together so they react more easily
C) only cells can replicate
D) biological reactions can occur only within cells
B
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Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A) 1.1 m/s2 B) 1.3 m/s2 C) 1.5 m/s2 D) 1.7 m/s2
A convex lens has focal length f. If an object is placed at a distance between f and 2f from the lens on the principal axis, the image is located at a distance from the lens
A) of 2f. B) between f and 2f. C) of f. D) that is greater than 2f. E) of infinity.
The San Andreas fault in California is a
A) thrust fault. B) strike slip fault. C) normal fault. D) reverse fault.
The equivalent capacitance of the circuit shown below is
a.
0.2 C.
b.
0.4 C.
c.
1 C.
d.
4 C.
e.
5 C.