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2 years ago

To calculate the ideal mechanical advantage of a lever divide the input arm by the

1 answer:

6 0

To calculate the ideal mechanical advantage of a lever divide the input arm by the output arm.
Mechanical advantage is the amount by which a machine can multiply an input force, calculated by dividing output Force in newtons by input force in newtons, while the ideal mechanical advantage is the mechanical advantage of a machine that has no friction, calculated by dividing the input distance by the output distance.

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A person hears the echo of his own voice from a distant hill after 2 seconds. How far away is the person from the hill, if the s

olga nikolaevna [1]

Answer: 330 m

Explanation:

The speed of sound $V$ is defined as the distance traveled by the sound wave $d$ in a especific time $t$ :

$V=\frac{d}{t}$

Where:

$V=330 m/s$ is the speed of sound

$t=\frac{2 s}{2}=1 s$ is half the time the sound wave travels since the person speaks, the sound wave hits the hill and then returns to the person again as an echo

$d$ is the distance between the person and the hill

So, we have to find $d$ :

$d=Vt$

$d=(330 m/s)(1 s)$

Finally:

$d=330 m$

4 0

2 years ago

Which statement best describes the difference between acceleration and velocity?

Sloan [31]

C. is the answer because acceleration is the change in velocity in time while velocity is speed with a direction

8 0

3 years ago

Two runners ran side by side, each holding one end of a horizontal pole. How would this affect the direction of the runners? Exp

zhuklara [117]

Answer:

They will run parallel to each other as the none of a straight pole cannot be bent in such a way where one side can turn without the other turning.

6 0

2 years ago

A marble slides without friction in a vertical loop around the inside of a smooth, 28.6 cm diameter horizontal pipe. The marble'

Leviafan [203]

Answer:3.49 m/s

Explanation:

Given

Speed of marble at Bottom $v=4.22 m/s$

Diameter of loop $d=28.6 cm$

As Energy is conserved therefore Energy at top is equal to energy at bottom

$E_T=E_B$

$\frac{mv^2}{2}+mgh=\frac{mv_0^2}{2}$ ,where $v_0$ is the velocity at bottom

$\frac{v^2}{2}+gh=\frac{v_0^2}{2}$

$v_0^2=v^2+2gh$

$v^2=v_0^2-2gh$

$v=\sqrt{v_0^2-2gh}$

$v=\sqrt{4.22^2-2\times 9.8\times 0.286}$

$v=\sqrt{17.8084-5.6056}$

$v=3.49 m/s$

7 0

2 years ago

What are groups 1,2 and 3 examples of on the periodic table

pishuonlain [190]

The number of the group identifies the column of the standard periodic table in which the element appears.
Group 1 contains the alkali metals ( lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium(Fr).)
Group 2 contains the alkaline earth metals ( beryllium (Be),magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra) )
Group 3: Scandium (Sc) and yttrium (Y)

4 0

2 years ago