1, 2 and 4 apply. im not sure that 2 ALWAYS applies though.
Answer:
acceleration
Explanation:
Even though the initial and final speeds are the same, there has been a change in direction for the object
Answer:
A. They can be reflected and refracted
Answer:
<em>Distance= 187.5 m
</em>
<em>Displacement= 12.5 m</em>
Explanation:
<u>Distance And Displacement
</u>
The question doesn't say what the length of the pool is, so we are assuming two things:
The pool is 50 m long.
One lap is one pool length, i.e. 50 m
Grant swims 3 3/4 laps. If we add up the total distance is 50*(3.75)=187.5 m
Grant starts in one end, swims one pool, then swims back one pool. Right now, he has zero displacement
Then he swims another pool and returns only 3/4 of the lap, which means he still needed 1/4*50 m=12.5 to arrive at his starting point. The final displacement is the subtraction of the final position minus the initial position, i.e. 12.5 m - 0 m= 12.5 m
Answer:
Distance= 187.5 m
Displacement= 12.5 m
Answer:
-47 °C
Explanation:
Speed of sound in air at sea level is:
v = 331 m/s + 0.6 m/s/°C T
where T is the temperature in Celsius.
The speed of sound is also the frequency times the wavelength:
v = fλ
Therefore:
fλ = 331 m/s + 0.6 m/s/°C T
(658 Hz) (0.46 m) = 331 m/s + 0.6 m/s/°C T
302.68 m/s = 331 m/s + 0.6 m/s/°C T
-28.32 m/s = 0.6 m/s/°C T
T = -47.2 °C
Rounding to two significant figures, the temperature is -47 °C.
