Answer:
116.3 electrons
Explanation:
Data provided in the question:
Time, t = 2.55 ps = 2.55 × 10⁻¹² s
Current, i = 7.3 μA = 7.3 × 10⁻⁶ A
Now,
we know,
Charge, Q = it
thus,
Q = (7.3 × 10⁻⁶) × (2.55 × 10⁻¹²)
or
Q = 18.615 × 10⁻¹⁸ C
Also,
We know
Charge of 1 electron, q = 1.6 × 10⁻¹⁹ C
Therefore,
Number of electrons past a fixed point = Q ÷ q
= [ 18.615 × 10⁻¹⁸ ] ÷ [ 1.6 × 10⁻¹⁹ ]
= 116.3 electrons
Answer:
Method B is the more efficient way of heating the water.
Explanation:
Method B is more efficient because by placing a heating element in the water as in described in method B, the heat that is lost to the surroundings is minimized which implies that more heat is supplied directly to the water. Therefore, more heating is achieved with a lesser amount of electrical energy input. Whereas placing the pan on a range means more heat losses to the surrounding and as such it will take a longer time for the water to heat up and also take more electrical energy.
Answer:
4.83m/
Explanation:
For a particle moving in a circular path the resultant acceleration at any point is the vector sum of radial and the tangential acceleration
Radial acceleration is given by 
r
Applying values we get 
X0.3m
Thus 
At time = 2seconds 
The tangential acceleration is given by 
Thus the resultant acceleration is given by
only the first season is good it went downhill ever since
Answer:1103 minutes/66180 seconds
Explanation:
FIRST STEP: is to FIND the value of K using the formula below;
K= d^n - d^n(o)/t .....................(1).
Parameters given from the question d^n = 4.5×10^-2 mm, d^n(o)= 1.7 × 10^-2 mm, t= 250 minutes(min) and n= 2.1.
Slotting in the parameters into the equation (1) above,then;
(4.5×10^-2)^2.1 - (1.7×10^-2)^2.1/ 250
= 5.2 × 10^-6 mm^2.1/min.
SECOND STEP: with the value of K from the second step, we can use it to calculate the required time based on the diameter. Therefore, equation (1) becomes;
t= d^2.1 - d^2.1(o)/ K
(8.7×10^-2)^2.1 - (1.7×10^-2)^2.1/ 5.2 × 10^-6
= 1,103 minutes.
