Answer:
a)  
b)  
Explanation:
From the question we are told that:
Density 
Velocity of wind 
Dimension of rectangle:50 cm wide and 90 cm
Drag coefficient 
a)
Generally the equation for Force is mathematically given by



Therefore Torque



b)
Generally the equation for torque due to weight is mathematically given by

Where

Therefore




 
        
             
        
        
        
Complete Question:
Find the resistance of a wire of length 0.65 m, radius 0.25 mm and resistivity 3 * 10^{-6} ohm-metre.
Answer:
Resistance = 9.95 Ohms 
Explanation:
<u>Given the following data;</u>
Length = 0.65 m
Radius = 0.25 mm to meters = 0.00025 m
Resistivity = 3 * 10^{-6} ohm-metre.
To find the resistance of the wire;
Mathematically, resistance is given by the formula;

Where;
- P is the resistivity of the material. 
- L is the length of the material.
- A is the cross-sectional area of the material. 
First of all, we would find the cross-sectional area of the wire.
Area of circle = πr²
Substituting into the equation, we have;
Area  = 3.142 * (0.00025)²
Area = 3.142 * 6.25 * 10^{-8}
Area = 1.96 * 10^{-7} m²
Now, to find the resistance of the wire;


<em>Resistance = 9.95 Ohms </em>
 
        
             
        
        
        
Answer:
v = 3.84 m/s
Explanation:
In order for the riders to stay pinned against the inside of the drum the frictional force on them must be equal to the centripetal force:

where, 
v = minimum speed = ?
g = acceleration due to gravity = 9.81 m/s²
r = radius = 10 m
μ = coefficient of friction = 0.15
Therefore,

<u>v = 3.84 m/s</u>
 
        
             
        
        
        
Answer:

Explanation:
To solve this problem, we can use the following suvat equation:

where
 is the vertical displacement of the frog
 is the vertical displacement of the frog
 is the initial vertical velocity
 is the initial vertical velocity
t is the time
a is the acceleration
We have chosen this formula because apart from  , all the other quantities are known. In fact:
, all the other quantities are known. In fact:
 is the vertical displacement
 is the vertical displacement
t = 2 s is the total time of flight
 is the acceleration due to gravity (negative because it is downward)
 is the acceleration due to gravity (negative because it is downward)
Therefore, solving for  , we find the initial velocity of the frog:
, we find the initial velocity of the frog:
