A car travels counterclockwise around a flat circle of radius 0.25 km at a constant speed of 20 m/s. When the car is at point A as shown in the figure, what is the car's acceleration?
a.
1.6 m/s2, south
b.
Zero
c.
1.6 m/s2, east
d.
1.6 m/s2, north
e.
1.6 m/s2, west
e
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As the volume of an ideal gas is increased at constant pressure the average molecular speed:
A. increases B. decreases C. increases at high temperature, decreases at low D. decreases at high temperature, increases at low E. stays the same
The end of a compass needle that points to the south pole of a magnet is the
A) north pole. B) south pole. C) both of these
A common way a robotic spacecraft can be accelerated and have its trajectory changed without the use of any fuel is via
A) a gravitational slingshot from another spacecraft B) radiation pressure from the Sun C) the ejection of mass from the probe D) a gravitational slingshot from another planet
As you approach a steady light source, the wavelength of the emitted light appears
A) longer. B) shorter. C) the same.