Answer:
20.45%
Explanation:
The probability that the student got a B is
Now, how many students are there in total?
The answer is
How many students got a B?
The answer is
therefore, the probability that the student has got a B is
Hence, the probability that a student has got a B is 20.45%
Answer:
A South pole repels a nort pole is not true
Explanation:
South pole attract north pole
Answer:
A) total intensity = 5x10^-4W/m2
B) total intensity = 5.34x10^-4W/m2
Explanation:
Detailed explanation and calculation is shown in the image below
Answer:
Explanation:
Let +y is upward direction and backward be +x direction
then we have given data
From equation simple motion we find the time
So
To get the distance between the point the package ejected to the point it the ground.
Now we have to get the distance the helicopter travels during same interval
Now to get the distance between the package and helicopter when package hit the ground
Answer:
K = 36 J
Explanation:
In this exercise we must use the conservation of mechanical energy at two points at initial x = 0 and the end point of maximum compression of the spring
Initial x = 0
Em₀ = K = ½ m v²
Final point of maximum compression
= Ke = ½ k x²
Em₀ =
K = ½ k x²
We put the kinetic energy because it is a data, let's look for the spring constant
k = 2 K / x²
k = 2 9 / d²
k = 18 / d²
Let's calculate the kinetic energy, so that the compression is x = 2d
K = ½ k x²
K = ½ (18 / d²) (2d)²
K = ½ 18/d² 4d²
K = 36 J