In 20 minutes, Kara ran 2.40 km on a treadmill facing due east. Relative to the gym, what were her displacement and average velocity during this time interval?
a. 0; 0
b. 0; 2.00 m/s
c. 2.40 km, east; 0
d. 2.40 km, east; 2.00 m/s, east
e. 2.40 km, west; 2.00 m/s, west
a
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The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center b. the Copernican system used elliptical planetary orbits c. the Copernican system used uniform circular motion d. the Copernican system assumed all planets orbited the Sun
Constant Acceleration Kinematics: An object is moving in a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?
A. 30 m B. 39 m C. 48 m D. 57 m
A 25.0-mH inductor, a 2.00-?F capacitor, and a certain resistor are connected in series across an ac voltage source at 1000 Hz. If the impedance of this circuit is 200 ?, what is the resistance of the resistor?
A) 100 ? B) 184 ? C) 200 ? D) 552 ? E) 579 ?
The figure below shows a planet traveling in a clockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
a.
its speed is constant.
b.
its speed is increasing.
c.
its speed is decreasing.
d.
its speed is a maximum.
e.
its speed is a minimum.