The equation for the resistance R is: R=ρ*(l/A), where, ρ is electrical resistivity, l is the length of the conductor, and A is the surface area.
The initial surface area is:
A=r²π, then when we double the radius we get:
A₁=(2*r)²π=4*r²π=4*A
Initial resistance is: R=ρ*(l/A).
When we double the radius, resistance is: R₁=ρ*{ l / (4*A) }
The ratio of the new resistance to the old one:
R₁/R=[ρ*(l/A)] / [ ρ* { l / (4*A) } ] = ρ, l and A cancel out and we get:
R₁/R=(1/1)/(1/4)=4/1
C. Disregard a goal if you don’t achieve it
The work is done in propelling this capsule 178200 g mile pounds.
<h3>
What is work?</h3>
When an external force moves an object over a distance, at least a fraction of that force must be exerted in the displacement's direction. By multiplying the length of the path by the component of the force acting along the path, work can be calculated if the force is constant. The work W is equal to the force f times the distance d, or W = fd, to mathematically describe this idea. The work is W = fd cos θ if the force is applied at an angle θ of the displacement. Work on a body is achieved in a variety of ways, not just by moving it from one location to another.
Work= Force × Distance= Fd
F=ma=mg where m is mass and g is the acceleration due to gravity
Work= 165 pounds × g×1080 m= 178200 g mile pounds.
To learn more about work, visit:
brainly.com/question/25573309
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<u>ANSWER-:</u>
1/2 mv²
K.E = 1/2 mv²
K.E = 0.01 J.
Hence, the kinetic energy of a body is 0.01 Joule.
<u>!</u><u>!</u><u> </u><u>HOPE </u><u>ITS </u><u>HELP </u><u>U </u><u>!</u><u>!</u><u> </u>
9.19 seconds (2dp)
Given:
v = 50m/s
u = 0 m/s
a = 5.44 m/s
t = ?
Substitute values into the equation v = u + at
v = u + at
50 = 0 + 5.44 x t
t = 50/5.44
t = 9.19 seconds
Time is in seconds as the velocity and acceleration are in metres per second instead of kilometres per hour
