When a drawn bow of potential energy 40 J is fired, the arrow will ideally have a kinetic energy
A) less than 40 J.
B) more than 40 J.
C) of 40 J.
Answer: C
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A crate is at rest on a horizontal floor, with nobody pushing. The friction force acting on the crate is
A) zero. B) equal to the weight of the crate. C) between zero and the weight of the crate. D) none of the above
When the equation Al + O2? Al2O3 is balanced, the coefficient of Al is
a. 1 b. 2 c. 3 d. 4
Which of the following intermolecular forces best describes why nonpolar molecules like gasoline (C8H18) have only limited solubility in water?
A) dipole-dipole B) induced dipole-induced dipole C) dipole-induced dipole D) ion-dipole E) Both A and B
The magnetic field in a region of space is parallel to the surface of a long flat table. Imagine that this page is lying flat on the table. When current is present in the coil, which is lying on the table, the coil tends to rotate so that the left side moves up and the right side moves down. The magnetic field is
a.
directed parallel to the page and downwards.
b.
directed parallel to the page and upwards.
c.
directed parallel to the page and to the right.
d.
directed parallel to the page and to the left.
e.
in a direction that cannot be determined in this experiment