3 years ago

The table shows Iyad's checking account activity for several weeks. Iyad's beginning balance was $538.

1 answer:

5 0

<span>The deposits are: 0, 0, +235, 120 and 0. The withdrawls are -215, -170, 0, 0 and - 425. Then you mus just due the algebraic sum, including the beginning balance, i.e. $ 538 + $ 235 + $ 120 - $ 215 - $ 170 - $ 425 = $ 83. Then, the answer is the option D. $83. </span>

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A brick of mass 4 kg hangs from the end of a spring. When the brick is at rest, the spring is stretched by 3 cm. The spring is t

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Answer:

Step-by-step explanation:

In this system we have the force of the spring and the gravitational force. The equation that describes that is

$F_{s}+F{g}=ma\\k(y_0+y)-mg=ma$

where y0 is the equilibrium position when the string is free and y0+y is the new equilibrium position when the object is hanged of the string. By replacing by derivatives we have

$ky_0+ky-mg=ma\\mg+ky-mg=ky=ma\\\\ky=m\frac{d^2y}{dt^2}\\\\my''+ky=0$