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3 years ago

Explain how temperature can bring about changes in the state of matter

Physics

1 answer:

RUDIKE [14]3 years ago

3 0

When temperature increases a solid can melt to a liquid and a liquid can turn to gas.

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A wrench 20 cm long lies along the positive y-axis and grips a bolt at the origin. A force is applied in the direction 0, 4, −3

Andreyy89

Answer:

1250 N

Explanation:

length of wrench = 20 cm = 0.2 m

Write the length of wrench in vector form

r = 0.2 j metre

Direction of force= $\frac{0i+4j-3k}{\sqrt{0 + 16 + 9}}=\frac{0i+4j-3k}{5}$

Let the magnitude of force is F

So, write the force in vector form

F = F $\frac{0i+4j-3k}{\sqrt{0 + 16 + 9}}=\frac{0i+4j-3k}{5}$

torque, T = 150 Nm

Torque = T = r x F

$150 i =0.2j\times F\frac{0i+4j-3k}{5}$

F = 1250 N

Thus, the magnitude of force is 1250 N.

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3 years ago

The cretaceous-paleogene was a mass extinction event in which nearly every single large, land-dwelling dinosaur went extinct. WH

vlabodo [156]

.Meteorites struck the region that Mexico now occupies

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3 years ago

Read 2 more answers

A submarine is 2.99 ✕ 102 m horizontally from shore and 1.00 ✕ 102 m beneath the surface of the water. A laser beam is sent from

Vsevolod [243]

Answer:

a The diagram of the situation is shown on the first uploaded image

b the angle of incidence beam striking the water is $\theta = 49.63^o$

c the angle of refraction beam striking the water is $r = 59.7^o$

d The angle the refracted beam make with respect to the horizontal is $= 30.3^o$

e The height of the target above sea level is

$h= 125.05m$

Explanation:

From the diagram we see that the angle of the beam striking the water is

$tan \theta = \frac{100}{85}$

$\theta = tan^{-1}(\frac{100}{85} )$

$= 49.63^o$

According to Snell's law

$\mu_{water} *sin(i) = \mu_{air} *sin(r)$

Where $\mu_{water }$ is the refractive index of water = 1.333

$i$ is the angle of incidence

$\mu_{air}$ is the refractive index of air = 1

r is the angle of refraction

Substituting values accordingly

$1.33 * sin (40.37) = 1 * sin(r)$

Making r the subject of the formula

$r = sin^{-1}(\frac{1.333 *sin(40.37)}{1})$

$= 59.7^o$

looking at the diagram we can see that to obtain the angle the refraction beam makes with the horizontal by subtracting the angle refraction from 90°

i.e $90 -59.7 = 30.3$ °

From the diagram we see that the height target above sea level can be obtained by this relation

$tan \theta = \frac{h}{214}\\$

Where h is the is the height

$tan(30.3) = \frac{h}{214}$

$h = 214 * tan (30.3)$

$=125.05m$

4 0

3 years ago

Foraging bees often move in straight lines away from and toward their hives. Suppose a bee starts at its hive and flies 680 m du

lys-0071 [83]

Represent the motion in the number line.

Movement to the east is movement to the negative side. Movement to the west is movement to the positive side.

Total displacement = -680m + 430m - 620m = -870m

Total displacement = 860m to the east.

8 0

3 years ago

Who was the first scientist to propose that an object could emit only certain amounts of energy?

Rzqust [24]

It was Niels Bohr who proposed it

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3 years ago