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electric circuit
Answer:
15.1 N
Explanation:
mass of block (m) = 4 kg
angle of inclination = 36 degrees
applied force (P) = 31 N
acceleration due to gravity (g) = 9.8 m/s^{2}
since the block is moving at a constant speed, it means the acceleration is 0 and therefore the summation of all the forces acting on the body is 0
therefore
P - f - mgsinθ = 0
where
- P = applied force
- f = frictional force
- m = mass
- g = acceleration due to gravity
when P = 31 N and the block is pushed upward
31 - f - (4 x 9.8 x sin 36) = 0
f = 7.96 N
now that we have the value of the frictional force we can find P required to lower the block, our equation becomes p + f - mgsinθ = 0 since the block is to be lowered
P + f - mgsinθ = 0
P = mgsinθ - f
P = (4 x 9.8 x sin 36) - 7.96 = 15.1 N
Answer:
Explanation:
Mass of gold deposited = 0.5 g
Molar mass of gold = 197 g/mol
Time, t = 6 hours
= 6 × 3600
= 12600 s
Number of moles = mass/molar mass
= 0.5/197
= 0.00254 mole
Assuming
Au --> Au+ + e-
Faraday constant = 9.65 x 104 C mol-1
Q = 96500 × 0.00254
= 244.924 C
Q = I × t
I = 244.924/12600
= 0.011 A
= 11.34 mA.