Answer: A, a polished pale yellow surface would likely be the best reflector of heat energy.
Answer:
i) 2
ii) No
Explanation:
i) The man will hear two sounds: one through the rail, and one in the air.
ii) The sounds will not reach the man at the same time. Sound travels faster through solids than through gases, so he will hear the sound through the rail before he hears the sound in the air.
Answer:
<em>Andrew's dog's speed was 1.89 m/s</em>
Explanation:
<u>Motion at Constant Speed</u>
An object is said to travel at constant speed if the ratio of the distance traveled by the time taken is constant.
This can be written as the formula below:
Where
v = Speed of the object
d = Distance traveled
t = Time taken to travel d.
Andrew's dog run a distance of d=17 meters in a time of t=9 seconds, thus its speed was;
v = 1.89 m/s
Andrew's dog's speed was 1.89 m/s
Explanation:
Hints:
Use the formula below to find the period.
Where f is the frequency in Hertz, and T is the time period in seconds.
To calculate the wavelength
use:
frequency=speed×wavelength
use the speed of sound. Make wavelength the subject of the formula and solve