Answer:
0.014 kg
Explanation:
trust me its right i took the assessment and got 100%. :)
The change in velocity with a constant resistance of the body during the first 20 s = -10/9 ms⁻¹
The change in velocity of the body during the first 20 s = 10/9
Mass = 18 kg.
Resistance to motion = 20 N
Decreases at a uniform rate from 60 N to 35 N
time = 25 s,
Force which decreases at a uniform rate = (60 - 35)/25 = 25/25
= 1 NS⁻¹
Initial velocity,
F = p/t
= mv/t = 18*v/t
V = (60 - 20) /18 = 20/9
Final velocity,
Decreases at a uniform rate = = 1 NS⁻¹
at 20 s = 20 N decrease
total force applied at 20 s without resistance = 60 -20-20 = 20.
V final = 20/18 = 10/9
Change in velocity = V final - v initial
= 10/9 - 20/9
= -10/9
Resistance is described as a refusal to provide in or to something that slows down or prevents some thing. An instance of resistance is a toddler combating against her kidnapper. An instance of resistance is wind against the wings of a aircraft.
The unit of the electrical resistance, measured with direct present day, is the ohm (Ω), named after the German physicist and mathematician Georg Simon Ohm. in step with ohm's regulation, the resistance R is the ratio of the voltage U across a conductor and the modern R = U / I.
Learn more about resistance here:-brainly.com/question/17563681
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Answer:
Scalar Quantity
Explanation:
A scalar has only magnitude, while a vector quantity has magnitude and direction.
An example of a vector would be 5m/s West.
Answer:
dimension is 20ft*20ft*10ft
Explanation:
let a,a and h are length, width and height of given tank with square base.
volume = a*a*h
surface area =aa +2(ah+ah)
for weight to minimize, surface area is to be minimum i.e.
a = 20ft
now
at a = 20 ft
h = 10ft
hence dimension is 20ft*20ft*10ft
Answer:
Part a)
Part b)
direction = downwards
Explanation:
As we know that the negative charge will experience the force due to some other charge below it
the force is given as
now we know that
now plug in all data
since this is a repulsion force so it must be a negative charge
Part b)
As per Newton's III law it will exert equal and opposite force on it
So here the force on the charge below it will be same in magnitude but opposite in direction
so here we have
direction = downwards