Answer:
95 feet
Explanation:
We have given that 4 boards are of so total number of feet of 4 boards =
Two board are of so total number of feet of two board
And two boards are of so total feet
So total height of all boards = 58.5+23.5+13=95 feet
Sound waves <span>can NOT travel through the vacuum of space?</span>
Answer:
16J
Explanation:
From hookes law
The work done in a spring is given as W =1/2ke^2
Given that the force constant (k) is constant in the spring material
We have that 2W = e^2
Let W1 = 4J e1= 2cm e2 = 4cm
Let W2 be the work required to stretch it an additional 4cm
W1/ W2 = e1^2/e2^2
W2 = W1* e2^2 / e1^2
= 4* 4^2 /2^2
=4× 16 / 4
= 16J
Answer:
TRUE
Explanation:
It is TRUE that pedestrians, bicyclists and slow-moving vehicles are not allowed on expressways because expressways have minimum speed limit requirements that these travelers cannot reach. This minimum limit of speed varies country to country.
In America, the minimum speed limit <u>in Rural Areas is 40 mph (miles per hour) i.e. 65km/h</u> (kilometer per hour) while <u>in Urban Areas it is 55mph i.e. 90km/h</u> which cannot be met by pedestrians and by-cycles easily.