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
Answer:
404.4 m
Explanation:
Converting the initial speed from km/h to m/s then
The acceleration is resolved as shown in the figure hence
deceleration of the truck along the inclined plane will be
where g is acceleration due to gravity
Substituting g with 
then
Using kinematic equation
and making s the subject then
where v and u are final and initial velocities respectively
Substituting 0 for v, 38.89 m/s for u and 
then
Power = (voltage) · (current)
71 W = (120 V) · (current)
Divide each side by (120 V) :
Current = (71 W) / (120 V) = 0.59167 Amperes
What I want to know is: Where can I buy a 71-W light bulb ?
Answer:
2kg
Explanation:
Whereas weight of an object depends on acceleration due to gravity, the mass remains constant because the number of atoms in an element remains constant. Therefore, despite the variation of acceleration due to gravity on moon and earth, the mass will remain 2 kg but tge weight will change.
Answer:
c
Explanation:
im not sureee butt i think thats thw answer
