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3 years ago

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Physics

2 answers:

marusya05 [52]3 years ago

6 0

Happy hanukkah or christmas people

netineya [11]3 years ago

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Answer:

what is the question

Explanation:

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Does a horseshoe go on the hoof or around it

Illusion [34]

Um I believe that it goes on top of the hoof

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4 years ago

If a rock is thrown vertically upward from the surface of Mars with velocity of 20 m/s, its height (in meters) after t seconds i

8_murik_8 [283]

The velocity of the rock after 2s is 12.56 m/s.

The velocity of the rock at 25 m upwards is 14.68 m/s.

The velocity of the rock at 25 m downwards is -15.97 m/s.

The given parameters;

velocity of the rock, u = 20 m/s
height of the rock, h = 20t - 1.8t²

The velocity of the rock after 2s is calculated as follows;

$v = \frac{dh}{dt}= 20 -2(1.86)t \\\\v = 20 - 3.72t\\\\at \ t= 2 \ s \\\\v = 20 - 3.72(2) = 12.56 \ m/s$

The velocity of the rock when the height is 25 m:

h = 20t - 1.8t²

25 = 20t - 1.8t²

1.8t² - 20t + 25 = 0

solve for the time of motion "t" using quadratic formula

a = 1.8, b = -20, c = 25

$t = \frac{-b \ \ +/- \ \ \sqrt{b^2 - 4ac} }{2a} \\\\t = \frac{-(-20) \ \ +/- \ \ \sqrt{(-20)^2 - 4(1.8\times 25)} }{2(1.8)}\\\\t = 9.67s, \ \ or \ 1.43 \ s$

The value of t that will give 25 m upwards using the motion model is 1.43 s;

h = 20(1.43) - 1.86(1.43)² = 25 m

The velocity of the rock at 25 m upwards (t = 1.43 s) is calculated as follows;

$v = \frac{dh}{dt} = 20 -3.72t\\\\v = 20 - 3.72(1.43) \\\\v = 14.68 \ m/s$

The velocity of the rock at 25 m downwards (t = 9.67 s) is calculated as;

$v = \frac{dh}{dt} = 20 - 3.72t\\\\v = 20 - 3.72(9.67)\\\\v = -15.97 \ m/s$

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3 years ago

How do i figure out the net force of an object? explain please :)

Savatey [412]

Draw a free body diagram to help you visualize. draw the object and use arrows to label and determine where all the forces acting upon it will be. then u add up the sum of all forces. if two forces of equal magnitude and opposite directions will cancel each other out.

3 0

3 years ago

One number is 9 more than twice another number. if the sum of the number is 129, find both numbers.

Paladinen [302]

Let's call the first number n, and the second number m.

n = 2m + 9 (9 more than twice the second number)

If the sum is 129, that means n + m = 129.

Now we can substitute the first expression (n = 2m + 9) into the second expression (n + m = 129), replacing the n.

(2m + 9) + m = 129

3m + 9 = 129

3m = 129 - 9

3m = 120

m = 120/3

m = 40

Now that we know m, we can find out n by replacing the m with 40 in the first expression (n = 2m + 9):

n = 2(40) + 9

n = 80 + 9

n = 89.

Therefore, n = 89, and m = 40.

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3 years ago

10. Draw the vector V and find the magnitude and direction, counter clockwise from the +x-axis.

Harman [31]

Answer:

v3784x/^&435 88888888888

7 0

3 years ago