Look at it this way:
Every time the plane flies through 400 miles of air,
the air moves it 40 miles backwards.
So it only covers 360 miles of ground in an hour.
<h2>
Option B is the correct answer.</h2>
Explanation:
Period of a spring mass arrangement is given by

where m is mass and k is spring constant.
So period of spring mass arrangement is independent of amplitude of motion.
Here amplitude changes from A to 2A.
Period for amplitude A is given by T.
Since period remains same for amplitude 2A also, the period is T.
Option B is the correct answer.
Answer:
d) 289.31 m
Explanation:
Energy provided by potential energy = mgh = m x 9.8x 200 sin10.5 = 357.18m
Energy used by friction = μmgcos 10.5 x 200 = .075 x m x 9.8 x cos 10.5 x200 = 144.54 m .
Energy used by friction on plain surface = μmg x d.( dis distance covered on plain ) =.075x m x 9.8 xd = .735 m d
To equate
357.18 m -144.54 m = .735 m d
d = 289.31 m .
Ammonia, Bananas, Bleach,
Tomatoes, Baking Soda are all examples of a base.
Answer:
The correct option is B
Explanation:
In part A pressure is given as 
In Part B we can calculate the pressure using the formula

Where F is the force which in this case is weight which can be obtained as follow
W = Mg
Substituting 70kg for M and
for g


A is the area with a value 
So substituting into the above equation

for part c
A 

F 

Therefore 

From this we see that the value of P for part B is the greatest