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Luda [366]
3 years ago
9

Andrew has a four-year college loan for $20,000. The lender charges a simple interest rate of 5 percent. How much interest will

he have to pay? simple interest = P × r × t A. $800 B. $4,000 C. $10,000
Physics
1 answer:
atroni [7]3 years ago
7 0

Answer:

B. $4,000

Explanation:

The formula for the simple interest is

interest = P\cdot r \cdot t

where

P is the principal

r is the interest rate

t is the number of years

In this problem,

P = 20,000 $

r = 0.05

t = 4 years

So the interest is

P=(20,000 $)(0.05 )(4)=4,000 $

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Two tiny, spherical water drops, with identical charges of −8.00 ✕ 10^(−17) C, have a center-to-center separation of 2.00 cm.
Damm [24]

Answer:

F=1.4384×10⁻¹⁹N

Explanation:

Given Data

Charge q= -8.00×10⁻¹⁷C

Distance r=2.00 cm=0.02 m

To find

Electrostatic force

Solution

The electrostatic force between between them can be calculated from Coulombs law as

F=\frac{kq^{2} }{r^{2} }

Substitute the given values we get

F=\frac{(8.99*10^{9} )*(-8.00*10^{-17} )^{2} }{(0.02)^{2} }\\ F=1.4384*10^{-19} N

7 0
3 years ago
A strontium vapor laser beam is reflected from the surface of a CD onto a wall. The brightest spot is the reflected beam at an a
sladkih [1.3K]

Answer:

d=1.29*10^{-6}m

Explanation:

From the question we are told that:

Distance of wall from CD D=1.4

Second bright fringe y_2= 0.803 m

Let

Strontium vapor laser has a wavelength \lambda= 431 nm=>431 *10^{-9}m

Generally the equation for Interference is mathematically given by

y=frac{n*\lambda*D}{d}

Where

d=\frac{n*\lambda*D}{y}

d=\frac{2*431 *10^{-9}m*1.4}{0.803}

d=1.29*10^{-6}m

8 0
2 years ago
The earth's magnetic field deflects the flow of current from?
alexgriva [62]
I don't really know the answer but maybe north pole and south pole?
7 0
3 years ago
Someone please helppp :|||
juin [17]

Answer:

b

Explanation:

4 0
2 years ago
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What is x-rays ? and how it's formed ?​
tia_tia [17]

X - rays are highly penetrating electromagnetic radiations that are formed when the cathode rays strikes a dense metal.

It has many characteristics such as :

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  • travels with the speed of light.

  • can ionize gases.
3 0
2 years ago
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