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Galina-37 [17]
2 years ago
15

Importance of simple machines pleasecgive answer in points​

Physics
1 answer:
oksian1 [2.3K]2 years ago
7 0

Answer:

Explanation:

The inclined plane

An inclined plane consists of a sloping surface; it is used for raising heavy bodies. The plane offers a mechanical advantage in that the force required to move an object up the incline is less than the weight being raised (discounting friction). The steeper the slope, or incline, the more nearly the required force approaches the actual weight. Expressed mathematically, the force F required to move a block D up an inclined plane without friction is equal to its weight W times the sine of the angle the inclined plane makes with the horizontal (θ). The equation is F = W sin θ.

The lever

A lever is a bar or board that rests on a support called a fulcrum. A downward force exerted on one end of the lever can be transferred and increased in an upward direction at the other end, allowing a small force to lift a heavy weight.

The wedge

A wedge is an object that tapers to a thin edge. Pushing the wedge in one direction creates a force in a sideways direction. It is usually made of metal or wood and is used for splitting, lifting, or tightening, as in securing a hammer head onto its handle.

The wheel and axle

A wheel and axle is made up of a circular frame (the wheel) that revolves on a shaft or rod (the axle). In its earliest form it was probably used for raising weights or water buckets from wells.

Its principle of operation is best explained by way of a device with a large gear and a small gear attached to the same shaft. The tendency of a force, F, applied at the radius R on the large gear to turn the shaft is sufficient to overcome the larger force W at the radius r on the small gear. The force amplification, or mechanical advantage, is equal to the ratio of the two forces (W:F) and also equal to the ratio of the radii of the two gears (R:r)

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Answer:

A flat, horizontal line  

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A is wrong. A downward-sloping line indicates that the temperature is decreasing with time.

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In a novel from 1866 the author describes a spaceship that is blasted out of a cannon with a speed of about 11.000 m/s. The spac
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Answer:

a=0.284\ m/s^2

Explanation:

Given that,

Initially, the spaceship was at rest, u = 0

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We need to find the acceleration experienced by the occupants of the spaceship during the launch. It is a concept based on the equation of kinematics. Using the third equation of motion to find acceleration.

v^2-u^2=2ad\\\\a=\dfrac{v^2-u^2}{2d}\\\\a=\dfrac{(11)^2-(0)^2}{2\times 213}\\\\a=0.284\ m/s^2

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Four forces of magnitude 10N,15N, 4N, 6N act on on object in the direction North West, East and South respectively, find their m
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If I now have 3g of Iodine-131, how much did I have 16 days ago?
qaws [65]

Answer:

12 grams of Iodine-13 was present 16 days ago

Explanation:

Given:

Amount of  Iodine-131 sample present now  = 3g

To Find:

Amount of Iodine-131 sample present before 16 days = ?

Solution:

W know that the half life of  Iodine-131  is  8days

Let the amount of sample before 16 days be X

Then

The  X amount  Iodine-131 sample will decay ito ist half after 8 days

after 8 days

=> X \times \frac{1}{2}

=> \frac{X}{2}

after  next 8 days , i.e., 16 days

=> \frac{X}{2}\times \frac{1}{2}

=> \frac{X}{4}

Now we know that after 16 days we have 3 grams of Iodine-131 sample

So,

\frac{X}{4}  = 3

X = 4 \times 3

X = 12

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