The smallest unit that makes up matter is an atom!
Answer:
A. ![2\cdot t](https://tex.z-dn.net/?f=2%5Ccdot%20t)
Explanation:
The SUV accelerates uniformly. In this case, speed (
) is directly proportional to time (
). That is:
(1)
![v = k\cdot t](https://tex.z-dn.net/?f=v%20%3D%20k%5Ccdot%20t)
Where
is the proportionality constant.
Then, we eliminate this constant by creating the following relationship:
(2)
If we know that
,
and
, then the time interval for the SUV to accelerate from rest to a speed
is:
![\frac{v}{t} = \frac{2\cdot v}{t_{2} }](https://tex.z-dn.net/?f=%5Cfrac%7Bv%7D%7Bt%7D%20%3D%20%5Cfrac%7B2%5Ccdot%20v%7D%7Bt_%7B2%7D%20%7D)
![t_{2} = 2\cdot t](https://tex.z-dn.net/?f=t_%7B2%7D%20%3D%202%5Ccdot%20t)
Hence, correct answer is A.
There is some evidence that regular static stretching outside periods of exercise may increase power and speed, and reduce injury. The best time to stretch is when the muscles are warm and pliable. This could be during a yoga or pilates class, or just after exercising.
Answer:
The inductance of solenoid A is twice that of solenoid B
Explanation:
The inductance of a solenoid L is given by
L = μ₀n²Al where n = turns density, A = cross-sectional area of solenoid and l = length of solenoid.
Given that d₁ = 2d₂ and l₂ = 2l₁ and d₁ and d₂ are diameters of solenoids A and B respectively. Also, l₁ and l₂ are lengths of solenoids A and B respectively.
Since we have a cylindrical solenoid, the cross-section is a circle. So, A = πd²/4.
Let L₁ and L₂ be the inductances of solenoids A and B respectively.
So L₁ = μ₀n²A₁l₁ = μ₀n²πd₁²l₁/4
L₂ = μ₀n²A₂l₂ = μ₀n²πd₂²l₂/4
Since d₁ = 2d₂ and l₂ = 2l₁, sub
L₁/L₂ = μ₀n²πd₁²l₁/4 ÷ μ₀n²πd₂²l₂/4 = d₁²/d₂² × l₁/l₂ = (2d₂)²/d₂² × l₁/2l₁ = 4d₂²/d₂² × l₁/2l₁ = 4 × 1/2 = 2
L₁/L₂ = 2
L₁ = 2L₂
So, the inductance of solenoid A is twice that of solenoid B
Answer:
If there is no horizontal component to the force then it is just 0N
Explanation: