Answer:
a) A = 0.07129 m²
b) A / A ’= 1.77
Explanation:
In this exercise we are asked to find the area in SI units, so let's start by reducing the dimensions to SI units.
width a = 8.5 inch (2.54 cm 1 inch) (1 m / 100 cm)
a = 0.2159 m
length l = 13 inch (2.54 cm / 1 inch) (1 m / 100 cm)
l = 0.3302 m
The area of a rectangle is
A = l a
A = 0.3302 0.2159
A = 0.07129 m²
b) we have a second sheet with reduced dimensions
a ’= 3/4 a
l ’= ¾ l
Let's find the area of this glossy sheet
A ’= l’ a ’
A ’= ¾ l ¾ a
A ’= 9/16 l a
To find the factor we divide the two quantities
A / A ’= l a 16 / (9 l a
A / A ’= 1.77
I think the answer is Fossils formed gradually over time.
The difference in the power required by the motor at start up and at operating speed is 9778.57
<h3>What is power? </h3>
This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:
Power (P) = voltage (V) × current (I)
P = IV
Power = square voltage (V²) / resistance ®
P = V² / R
<h3>How to determine the power by the EMF</h3>
- Voltage (V) = 37 V
- Resistance (R) = 0.14 Ω
- Power by EMF (P₁) =?
P = V² / R
P₁ = 62² / 0.14
P₁ = 27457.14 watts
<h3>How to determine the power by the back EMF</h3>
- Voltage (V) = 62 V
- Resistance (R) = 0.14 Ω
- Power by back EMF (P₂) =?
P = V² / R
P₂ = 37² / 0.14
P₂ = 9778.57 watts
<h3>How to determine the power difference</h3>
- Power by EMF (P₁) = 27457.14 watts
- Power by back EMF (P₂) = 9778.57 watts
- Difference in power =?
Difference = P₁ - P₂
Difference in power = 27457.14 - 9778.57
Difference in power = 17678.57 watts
Learn more about electrical power:
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It will move 1.5 minutes before it comes to a stopping point.
Answer:
The final velocity of the race car is 27.14 m/s
Explanation:
Given;
initial velocity of the race car, u = 18.5 m/s
acceleration of the race car, a = 2.47 m/s²
distance covered by the race car, s = 79.78 m
Apply the following kinematic equation to determine the final velocity of the race car.
v² = u² + 2as
v² = (18.5)² + 2(2.47)(79.78)
v² = 736.363
v = √736.363
v = 27.14 m/s
Therefore, the final velocity of the racecar is 27.14 m/s