A trapeze artist, with swing, weighs 700 N; he is momentarily held to one side by his partner so that the swing ropes make an angle of 30.0° with the vertical. In such a condition of static equilibrium, what is the horizontal force being applied by the partner?
a. 924 N
c. 808 N
b. 404 N
d. 233 N
B
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Mars' axial tilt and spin are most similar to ________.
A. Venus's B. Mercury's C. the Moon's D. Earth's
The uppermost layer of Earth's structure is called the ________.
A. surface B. silicate C. mantle D. core E. crust
An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field. b. Sonya, because the electron moves opposite to the direction of the field. c. Joanna, because the electron moves in the direction of the field. d. Sonya, because the electron moves in the direction of the field. e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.
Why do we call it the "periodic" table of the elements?
a. Because it was discovered in cycles, or periods. b. Because it was rediscovered repeatedly at different times in history. c. Because the properties of elements roughly repeat in each column. d. Because atomic weights increase across a row from left to right. e. Because it is updated periodically.