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4 years ago

8

Arun takes 17 1/3 minutes to run around the school ground . Sanjay takes 12 1/5 to do the same . Who takes lesser time and by wh

at fraction??

1 answer:

Fed [463]4 years ago

7 0

Sanjay would be faster

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Which figure always has exactly four lines of reflection that map the figure onto itself?

Salsk061 [2.6K]

Answer:

number 3

Step-by-step explanation:

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3 years ago

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A transformer increases the input voltage from 12V to 12,000V. What is the ratio of the number of wire turns on the primary coil

erma4kov [3.2K]

Answer:

$\frac{n_p}{n_s}=\frac{1}{1000}$

Step-by-step explanation:

Given voltage of primary coil is $V_p=12V$

And voltage of secondary coil is $V_s=12,000V$

A transformer is a device that contains primary and secondary coil. These coils are mounted on soft iron. The change in voltage depends upon the number of turns of primary coil $(n_p)$ and secondary coil $(n_s)$ .

Following equation represents the relation between them.

$\frac{V_s}{V_p} =\frac{n_s}{n_p}\\\\\frac{12,000}{12}=\frac{n_s}{n_p}\\\\1000=\frac{n_s}{n_p}$

Then, ratio of the number of wire turns on the primary coil to the number of turns on the secondary coil is

$\frac{n_p}{n_s}=\frac{1}{1000}$

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4 years ago

SOMEONE PLEASE HELP WILL MARK BRAINLIEST PLEASE EXPLAIN

zalisa [80]

Answer:

a. (x+5)^2 = 49

b. (x+7)^2 = (x+1)^2

Step-by-step explanation:

So the term "a number" is always going to be x. input x into the sentences. "X plus five, then squared, is forty-nine". when they do "is __", that means equal to. In the second question, seven more than x is x + 7 (the two numbers are interchangeable here). Equivalent also means equal. hope this helped :)

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3 years ago

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What is the answer to number 1 question?

never [62]

I do not know the answer

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4 years ago

NASA cameras film a rocket launcher vertically from the launch pad, 3 miles away. When the angle between the camera and the grou

Nimfa-mama [501]

The height of the rocket is found in terms of the angle as
.. h/(3 mi) = tan(θ)
.. h = (3 mi)*tan(θ)

Then the rate of change of height (vertical velocity) is
.. h' = (3 mi)*sec(θ)^2*θ'
.. h' = (3 mi)*4*(1.5 rad/min)
.. h' = 18 mi/min

The rocket's velocity is 18 miles per minute at that moment.

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3 years ago