A concave mirror has
A)
no focal length.
B)
a positive or negative focal length depending on the object position.
C)
a positive focal length.
D)
a negative focal length.
E)
a positive or negative focal length depending on the object size.
C
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A 40.0 liter gas tank is filled to the brim with gasoline when the temperature is 5.00
Gasoline has a coefficient of volume expansion of 
If the gas tank is moved into the sun of a hot summer day, the temperature of the gas tank is increased to 60.0 
What is the volume of gasoline that overflows the tank (ignore the expansion of the gas tank)?
A. 3.95 liters B. 3.11 liters C. 2.67 liters D. 2.09 liters E. 1.55 liters
The water flowing over Niagara Falls drops a distance of 50. m. Assuming that all the gravitational energy is converted to thermal energy, by what temperature does the water rise?
What will be an ideal response?
The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
and 
.
?
The plane is most likely
A. just touching down. B. in level flight in the air. C. ascending. D. descending. E. taking off.
A can, after having been given a kick, moves up along a smooth hill of ice. It will
A) have a varying acceleration along the hill. B) have the same acceleration, both up the hill and down the hill. C) have a constant acceleration up the hill, but a larger constant acceleration when it comes back down the hill. D) have a constant acceleration up the hill, but a smaller constant acceleration when it comes back down the hill. E) travel at constant velocity.