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andreev551 [17]
3 years ago
8

How do pulleys help move objects?

Physics
2 answers:
Naily [24]3 years ago
6 0

Pulleys are powerful simple machines. They can change the direction of a force, which can make it much easier for us to move something. If we want to lift an object that weighs 10 kilograms one meter high, we can lift it straight up or we can use a pulley, so we can pull down on one end to lift the object up.

Pachacha [2.7K]3 years ago
5 0

Answer:

Pulleys are powerful simple machines. They can change the direction of power, which can make it much easier for us to move something. If we want to lift an object that weighs 10 kilograms one meter high, we can lift it straight up or use a pulley, so we can pull one end down and lift the object.

Explanation:

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A visible violet light emits light with a wavelength of 4.00 × 10-7 m.
RideAnS [48]

Answer:

The correct option is B. 7.5 * 10¹⁴ Hz

Explanation:

Frequency = (speed) / (wavelength)

= (3 x 10⁸ m/s) / (4 x 10⁻⁷ m)

= (3/4 x 10¹⁵) ( m / m - s )

= (0.75 x 10¹⁵) /sec

= 7.5 x 10¹⁴ Hz

= 750,000 GHz

4 0
3 years ago
Read 2 more answers
What happens to the energy of a photon if the wavelength is doubled?.
Vladimir [108]

Answer:

Halving the wavelength doubles the frequency and, thus, doubles the energy of the incident photons. This doubles the energy given to each electron, nearly doubling its kinetic energy after it is free from the metal.

8 0
3 years ago
What’s the difference between mechanical and chemical weathering
vampirchik [111]

Answer:

Mechanical weathering is the physical breakdown of rock into smaller pieces. Chemical weathering is the breakdown of rock by chemical processes.

Explanation:

Mechanical weathering (also called physical weathering) breaks rock into smaller pieces. These smaller pieces are just like the bigger rock, just smaller. That means the rock has changed physically without changing its composition. The smaller pieces have the same minerals, in just the same proportions as the original rock.

Chemical weathering is the other important type of weathering. Chemical weathering is different from mechanical weathering because the rock changes, not just in size of pieces, but in composition Chemical weathering works through chemical reactions that cause changes in the minerals.

5 0
3 years ago
a kid is flying a kite 58 meters above the level ground. a small lead sphere is dropped from the kite. calculate the amount of t
Fynjy0 [20]

This is the formula you need to memorize:  

D = 1/2 · a · T²

Distance = (1/2) · (acceleration) · (Time²)

This formula tells the distance an object falls in any amount of time.

This question tells you the distance (58m), and you know the acceleration (gravity, 9.8 m/s²), so you can use this formula to find the time.

Distance = (1/2) · (acceleration) · (Time²)

58m  =  (1/2) · (9.8 m/s²) · (Time²)

Divide each side by (4.9 m/s²) :  Time²  =  (58/4.9) seconds²

Take the square root of each side:  <em>Time = 3.44 seconds  </em>

6 0
3 years ago
The density of diamond is 3.51 g/cm3 . the international (but non-si) unit for weighing diamonds is the "carat" (1 carat = 200 m
mixer [17]

To calculate the volume of the diamond, we use the formula

\rho =\frac{m}{V}

Here, \rho is the density and its value given 3.51 g/cm^3

and m is mass and its value given0.87 carat.

1 carat = 200 mg = 0.200 g

So mass of the diamond, m= 0.87 carat \times 0.200 g/carat = 0.174 g

Substituting these values in above equation we get,

\rho =\frac{0.174 g}{3.51 g/cm^3} =0.0495 cm^3

Thus the volume of given carat diamond is 0.0495 cm^3.


6 0
4 years ago
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