Which of the following units could be used for the average speed of an object? A. kilometers per hour (km/hr) B. miles per hour
1 answer:
Answer : The correct option is, (D) all of these
Explanation:
Average speed : It is defined as the ratio total distance to total time. It is a scalar quantity that means it is defined by the magnitude only.
Formula used :
The common units of average speed are miles per hour (mph), kilometers per hour (kph), meters per second (m/s), or feet per second (ft/s).
The S.I unit of average speed is meter/second (m/s).
Hence, all of the units could be used for the average speed of an object.
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A) See ray diagram in attachment (-6.0 cm)
By looking at the ray diagram, we see that the image is located approximately at a distance of 6-7 cm from the lens. This can be confirmed by using the lens equation:
where
q is the distance of the image from the lens
f = -10 cm is the focal length (negative for a diverging lens)
p = 15 cm is the distance of the object from the lens
Solving for q,
B) The image is upright
As we see from the ray diagram, the image is upright. This is also confirmed by the magnification equation:
where are the size of the image and of the object, respectively.
Since q < 0 and p > o, we have that , which means that the image is upright.
C) The image is virtual
As we see from the ray diagram, the image is on the same side of the object with respect to the lens: so, it is virtual.
This is also confirmed by the sign of q in the lens equation: since q < 0, it means that the image is virtual
