First we determine the motor's efficiency - a ratio of the mechanical output power and the electrical input power:
The output mechanical power is directly proportional to torque and angular speed. From this relationship we can isolate the torque:
whereby the last expression uses the angular speed in rpm units.
(a) we calculate the torque, given that the motor draws 1.2 times the rated current, i.e., 48 Amps:
(b) use formula for the acceleration time:
The startup time will be 0.74s
Answer:
2.05 x 10^8 m /s
Explanation:
c = 3 x 10^8 m/s
μ = c / v
where, μ is the refractive index, c be the velocity of light in air and v be the velocity of light in the medium.
μ = 1.461
1.461 = 3 x 10^8 / v
v = 3 x 10^8 / 1.461
v = 2.05 x 10^8 m /s
Answer:
Explanation:
- Given the current and voltage, we can find the resistance of the wore via the formula
R = V / I
V = Voltage = 1.5 V
I = Current = 0.40 A
R = 3.75Ω
- Now, from he formula of Resistance in a wire, we know that
R = ρL / A
ρ = Density of Aluminium = 2.710 
Radius of wire = 0.00031 m³, from the data given
A = Area of Wire = π×r²
A = 3.14159×0.00031
A = 0.00097 m²
- Now, having the complete data, we can find the length of the wire
L = (R*A)/ρ
L = (3.75 * 0.00097) / 2.710
L = 0.0013 meters
1. Record the barometric pressure.<span> </span>2. Measure about 10 g of ice using the chemical balance and place it into a 100 mL beaker.<span> </span>
I love you very much I think it is correct
