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3 years ago

5

A 3m beam of negligible weight is balancing in equilibrium with a fulcrum placed 1m from its left end. If a force of 50N is appl

ied on it's right end, how much force would need to be applied to the left end?
100N
25N
200N
50N

1 answer:

grigory [225]3 years ago

6 0

The force that would be apply is
100N

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A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with

Ymorist [56]

Answer:

the frequency of the beats is 8.7687 kHz

Explanation:

Given the data in the question;

The frequency for stationary source and moving observer is;

f' = f( 1 +( v_observer/v_sound))

we know that, speed of sound in dry air = 343 m/s

so we substitute

f' = 41.2 kHz( 1 + (33.0 m/s / 343 m/s) ) = 41.2kHz( 1 + 0.0962) = 41.2kHz(1.0962)

f' = 45.1634 kHz

Now the frequency for stationary observer and moving source with frequency f' will be

f" = f'( 1 / (1 - ( v_observer/v_sound)))

45.1634 kHz( 343 / 343 - 33)

we substitute

f" = 45.1634 kHz( 1 / (1 - (33.0 m/s / 343 m/s)))

f" = 45.1634 kHz( 1 / (1 - 0.0962))

f" = 45.1634 kHz( 1 / 0.9038 )

f" = 45.1634 kHz( 1.1064 )

f" = 49.9687 kHz

Now the beat frequency will be;

f_beat = f' - f

we substitute

f_beat = 49.9687 kHz - 41.2 kHz

f_beat = 8.7687 kHz

Therefore, the frequency of the beats is 8.7687 kHz

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3 years ago

1)Move your eraser on your desk What do you feel while you turn on the eraser?

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Answer:

The warmth you feel is the heat generated by the force of friction created by the rough surfaces of your hands rubbing together. As the abrasives in your eraser are rubbed against paper, friction produces heat, which helps the rubber become sticky enough to hold onto the graphite particles.

Explanation:

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3 years ago

Which shows the correct lens equation?

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Answer:

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3 years ago

Read 2 more answers

aliaa is skating down a ramp. the wheels on her skateboard have diameters of 60 \text{ mm}60 mm60, start text, space, m, m, end

GarryVolchara [31]

The total distance traveled by Aliaa using her skateboard for 20 revolution of the wheels is equal to 3770 millimeters.

<u>Given the following data:</u>

Diameter of skateboard = 60 mm.

Number of revolution = 20 revolutions.

Radius = diameter/2 = 60/2 = 30 mm.

<h3>What is distance?</h3>

Distance can be defined as the amount of ground covered (traveled) by a physical object over a specific period of time and speed, regardless of its direction, starting point or ending point.

For one revolution of the wheels, the distance traveled by Aliaa using her skateboard is given by:

Distance = 2πr

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Distance = 188.5 mm.

Therefore, the total distance traveled by Aliaa using her skateboard for 20 revolution of the wheels is given by:

Distance = 188.5 × 20

Distance = 3770 millimeters.

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2 years ago

How many moles of mgci2 are there in 326 g of the compound

ddd [48]

<h2>Hello!</h2>

The answer is: There are 3.42 moles of MgCl2 in 326g of the compound.

<h2>Why?</h2>

Assuming that the compound is MgCl2, we can find how many moles of the compound are in 326 g of the same compound, calculating the molar mass of the compound, so:

$Mg=24.305\frac{g}{mol}\\\\Cl=35.45\frac{g}{mol}$

Then,

$MgCl2MolarMass=24.305+(2*35.45)=95.21\frac{g}{mol}$

Therefore, to calculate how many moles are in 326 of the compound, we can use the following equation

$Moles=\frac{mass}{molarmass} =\frac{326g}{95.21\frac{g}{mol}}=3.42molesMgCl2$

Hence,

There are 3.42 moles of MgCl2 in 326g of the compound.

Have a nice day!

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3 years ago