How did Ptolemy explain the retrograde motion of Mars?
What will be an ideal response?
Mars will retrograde on the inner portion of its epicycle, when it is closest to us and its motion on the epicycle is more obvious than its motion along its deferent.
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A 4.00-kg mass is attached to a very light ideal spring hanging vertically and hangs at rest in the equilibrium position. The spring constant of the spring is 1.00 N/cm. The mass is pulled downward 2.00 cm and released
What is the speed of the mass when it is 1.00 cm above the point from which it was released? A) 0.0443 m/s B) 0.0744 m/s C) 0.0201 m/s D) 0.0866 m/s E) The mass will not reach the height specified.
Which of the following is a period of the Cenozoic era?
a. Eocene b. Quaternary c. Cretaceous d. Cambrian
A airplane that is flying level needs to accelerate from a speed of 200 m/s to a speed of 240 m/s while it flies a distance of 1200 m. What must the acceleration of the plane be?
A) 4.44 m/s2 B) 2.45 m/s2 C) 7.33 m/s2 D) 5.78 m/s2 E) 1.34 m/s2
How long is a wire made from 200 cm3 of copper if its resistance is 8.5 ohms? The resistivity of copper is 1.7 × 10^–5 W•m
a. 10 m c. 7.1 m b. 2.2 × 10^2 m d. 3.0 × 10^3 m