The amount left of a given substance can be calculated through the equation,
A = (A0) x 0.5^n/h
From the given scenario,
A/A0 = 0.75 = 0.5*(60/h)
The value of h from the equation is 144.565 minutes.
Answer:
The answer are as followed: B is the correct answer, hope that helps :)
Answer: (c) 2000 N
Explanation:
Given Data :
▪ Initial velocity = zero ( body is at rest)
▪ Distance travelled = 100m
▪ Final kinetic energy = 200000J
To Find :
▪ Resultant force acting on the car.
Therefore:
W = F × d = ΔK ----------------- eq 1.
where,
W = work done
F = applied force
d = distance
ΔK = change in kinetic energy
Calculation :
→ F × d = Kf - Ki ----------------- eq 2.
Where:
Kf = Final kinetic energy = 200000
Ki = initial kinetic energy = 0
Substituting our values into the formula from equation (2)
→ F × 100 = 200000 - 0
→ F = 200000/100
→ F = 2000N
M₁V₁ = m₂V₂
<span>KE = ½mV² </span>
<span>½m₁V₁² = 2*½m₂V₂² </span>
<span>m₁V₁ = m₂V₂ </span>
<span>½m₁V₁² = m₂V₂² </span>
<span>m₁/m₂ = V₂/V₁ </span>
<span>m₁/m₂ = 2V₂²/V₁² </span>
<span>V₂/V₁ = √(½m₁/m₂) </span>
<span>m₁/m₂ = √(½m₁/m₂) </span>
<span>squaring</span>
<span>(m₁/m₂)² = ½m₁/m₂ </span>
<span>2m₂m₁² = m₁m₂² </span>
<span>divide by m₁m₂ </span>
<span>2m₁ = m₂ </span>
<span>m₂/m₁ = 2
hope this helps</span>
