If the mother in this photo weighs four times as much as the child, where should she sit to keep the seesaw level if the child is seated at the far right hand side?
a. At the midpoint between the left end of the seesaw and the pivot point.
b. Halfway between the midpoint and the pivot point.
c. At the far left hand side of the seesaw.
d. One fourth of the distance from the pivot to the left end of the seesaw.
e. Halfway between the midpoint and the end of the left side of the seesaw.
b
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Answer the following statement(s) true (T) or false (F)
Creating a quanton in a superposition of an observable’s eigenvectors and then determining that observable’s value is entirely analogous to putting a coin in a can, shaking the can, and then revealing the coin.
When a massive star begins to run out of hydrogen to fuse, its core ________.
A. expands and cools B. expands and heats C. contracts and cools D. contracts and heats
Find the magnetic energy stored in the air gap between two very large magnetic pole pieces, one North, one South, each with an area of 100 cm2. Assume the 0.05-T magnetic field is uniform within the 2-cm gap.
What will be an ideal response?
The mass in the figure below slides on a frictionless surface
When the mass is pulled out, spring 1 is stretched a distance x1 from its equilibrium position and spring 2 is stretched a distance x2. The spring constants are k1 and k2, respectively. The force pulling back on the mass is
?
?
?
a.
?k2x1.
b.
?k2x2.
c.
?(k1x1 + k2x2).
d.
