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lindseyreneesmith7
23.06.2021 •
Physics
At the local grocery store, you push a 14.5-kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0 N you now accelerate the cart from rest through a distance of 2.29 m in 3.00 s. What was the mass of the dog food?
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Ответ:
The mass of the dog food added is 9.03 kg
Explanation:
Given;
mass of the shopping cart, m₁ = 14.5 kg
let the mass of the bag added = m₂
the force applied, F = 12 N
initial velocity of the cart-bag system, u = 0
distance traveled by the system, d = 2.29 m
time of motion of the system, t = 3.0 s
The acceleration of the system is calculated as;
The total mass of the system (M) is calculated as follows;
F = Ma
M = F/a
M = (12)/(0.51)
M = 23.53 kg
The mass of the dog food added is calculated as;
m₂ = M - m₁
m₂ = 23.53 kg - 14.5 kg
m₂ = 9.03 kg
Ответ:
magnification will be -0.025
Explanation:
We have given the radius of curvature = 12 cm
And object distance = 3 m
So focal length![f=\frac{R}{2}=\frac{12}{2}=6cm](/tpl/images/0225/2079/cd2da.png)
Now for mirror we know that![\frac{1}{f}=\frac{1}{u}+\frac{1}{v}](/tpl/images/0225/2079/6bf09.png)
So![\frac{1}{0.06}=\frac{1}{3}+\frac{1}{v}](/tpl/images/0225/2079/22aa3.png)
v = 0.750 m
Now magnification of the mirror is![m=\frac{-v}{u}=\frac{-0.750}{3}=-0.025](/tpl/images/0225/2079/0c321.png)