Ep= mgh
Ep = 40 x 9.8 x 10
Ep = 3920J
Ep = 3900J (2sf)
        
             
        
        
        
Answer:
 Hz
 Hz
Explanation:
We know that 
1 cm = 0.01 m
 = Length of the human ear canal = 2.5 cm = 0.025 m
 = Length of the human ear canal = 2.5 cm = 0.025 m 
 = Speed of sound = 340 ms⁻¹
 = Speed of sound = 340 ms⁻¹
 = First resonant frequency
 = First resonant frequency 
The human ear canal behaves as a closed pipe and for a closed pipe, nth resonant frequency is given as 

for first resonant frequency, we have n = 1 
Inserting the values


 Hz
 Hz
 
        
             
        
        
        
Answer:
If inflation is relatively lower than competitors, then the countries goods will become more attractive and demand will rise. Lower inflation tends to increase the value of the currency in the long term. 
Explanation:
 
        
             
        
        
        
Answer:
α = 3×10^-5 K^-1
Explanation:
let ΔL be the change in length of the bar of metal, ΔT be the change in temperature, L be the original length of the metal bar and let α be the coefficient of linear expansion.
then, the coefficient of linear expansion is given by:
α = ΔL/(ΔT×L)
    = (0.3×10^-3)/(100)(100×10^-3)
    = 3×10^-5 K^-1
Therefore, the coefficient of linear expansion is 3×10^-5 K^-1
 
        
             
        
        
        
Answer:
181.48 N
Explanation:
Calculate the area :
Area = pi * r² ; 
pi = 3.14 ; r1 = 90cm /100 = 0.9m ; r2 = 10/100 = 0.1m
Area 1, A1 = 3.14 * 0.1² = 0.0314 m²
Area 2, A2 = 3.14 * 0.9² = 2.5434 m²
Force, F = mass * acceleration due to gravity
F2 = 1500 * 9.8 = 14700 N
Force 1 / Area 1 = Force 2 / Area 2
Force 1 = (Force 2 / Area 2), * Area 1
Force 1 = (14700 / 2.5434) * 0.0314
Force = 5779.6650 * 0.0314
= 181.48 N