Your dream is to buy a yacht currently valued at $300,000. you decide to put some money aside at the end of each month so you can buy your yacht without having to take out a loan. the bank guarantees an annual percentage rate of 5.1% as long as you have an account with them. if you decide to put aside $500 each month how long will it take you to buy this yacht if the current price stays the same? (round fractional year up).
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Ответ:
It will take you 79 years to buy the yacht
Explanation:
The future amount of an investment can be calculated using the formula;
A=P(1+r)^n
where;
A=Future value of the investment
P=Initial deposit
r=annual interest rate
n=number of years of the investment
In our case;
A=300,000 since current price remains the same
P=(500×12)=6,000 yearly
r=5.1%=5.1/100=0.051
n=unknown
replacing;
300,000=6,000(1+0.051)^n
6,000(1.051)^n=300,000
1.051^n=300,000/6,000
1.051^n=50
ln 1.051^n=ln 50
n ln 1.051=ln 50
0.0497 n=3.912
n=3.192/0.0497
n=78.65 rounded up to 79 years
It will take you 79 years to buy the yacht
Ответ:
92.7 km
Explanation:
Since the magnetic field due to a solenoid is given by B = μ₀Ni/L where μ₀ = permeability of free space = 4π × 10⁻⁷ H/m, N = number of turns of solenoid, L = length of cardboard tube = 58 cm = 0.58 m, , i = current in wire = 2.5 A and l = length of wire.
So, N = BL/μ₀i
Since B = 2.0 kG = 2.0 × 10³ G = 2.0 × 10³ × 10⁻⁴ T = 2.0 × 10⁻¹ T = 0.2 T
So, substituting the variables into the equation, we have
N = BL/μ₀i
N = 0.2 T × 0.58 m/(4π × 10⁻⁷ H/m × 2.5 A)
N = 1.16 Tm/(31.416 × 10⁻⁷ HA/m)
N = 0.0369 × 10⁷ turns
N = 0.0369 × 10⁷ turns
N = 3.69 × 10⁵ turns
length of wire l = NC where N = number of turns and C = circumference of tube = πD where D = diameter of tube = 8.0 cm = 0.08 m
So, l = NC
= NπD
= πND
= π × 3.69 × 10⁵ turns × 0.08 m
= 0.9274 × 10⁵ m = 9.274 × 10⁴ m
= 92.74 × 10³ m
= 92.74 km
≅ 92.7 km