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MA_775_DIABLO [31]
4 years ago
15

at room temperature, iron is a solid and mercury is a liquid. based on this information we can infer thata. iron has a higher bo

iling point than mercury.b. mercury has a higher melting point than iron.c. iron and mercury have similar melting points.d. the boiling point of iron and mercury are both low.
Physics
2 answers:
olchik [2.2K]4 years ago
8 0
A. iron has a higher boiling point thanmercury.
max2010maxim [7]4 years ago
8 0

Answer:

A

Explanation:

The general rule when it comes to the states of matter is that, the higher the temperature gets, the more the individual molecules vibrate, and they have more energy to escape the bonds that hold them in place. While, if the temperature decreases, then the molecules have less kinetic energy and the bonds/forces between the molecules ends up keeping them in a position where they cannot escape.

So with the example of iron. Iron is solid at room temperature, and hence would have a high melting point and boiling point, when compared with a substance that is liquid at room temperature (mercury).

If mercury is in a liquid state, then that means it is closer to its boiling point, than another element in a solid state.

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Block B has mass 6.00 kg and sits at rest on a horizontal, frictionless surface. Block A has mass 2.50 kg and sits at rest on to
zzz [600]

Answer:

Explanation:

Block A sits on block B and force is applied on block A . Block A will experience two forces 1) force P and 2 )  friction force in opposite direction of motion . Block B will experience one force that is force of friction in the direction of motion .

Let force on block A be P . friction force on it will be equal to kinetic friction, that is μ mg , where μ is coefficient of friction and m is mass of block A

friction force = .4 x 2.5 x 9.8

= 9.8 N

net force on block A = P - 9.8

acceleration = ( P - 9.8 ) / 2.5

force on block B = 9.8

acceleration = force / mass

= 9.8 / 6

for common acceleration

( P - 9.8 ) / 2.5  = 9.8 / 6

( P - 9.8 ) / 2.5 = 1.63333

P = 13.88 N .

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Read 2 more answers
One kind of baseball pitching machine works by rotating light and stiff rigid rod about a horizontal axis until the ball is movi
erastova [34]

Answer:

(a). The ball's centripetal acceleration is 16.17\times10^{2}\ m/s^2

(b). The magnitude of the net force is 232.9 N.

Explanation:

Given that,

Mass of baseball = 144 g

Speed = 81 mph = 36.2 m/s

Distance = 81 cm

(a). We need top calculate the ball's centripetal acceleration just before it is released

Using formula of centripetal acceleration

a=\dfrac{v^2}{r}

Where, v = speed

r  = radius

Put the value into the formula

a=\dfrac{(36.2)^2}{81\times10^{-2}}

a=1617.82\ m/s^2

a=16.17\times10^{2}\ m/s^2

(b). We need to calculate the magnitude of the net force that is acting on the ball just before it is released

Using formula of force

F=\dfrac{mv^2}{r}

Put the value into the formula

F=\dfrac{144\times10^{-3}\times(36.2)^2}{81\times10^{-2}}

F=232.9\ N

Hence, (a). The ball's centripetal acceleration is 16.17\times10^{2}\ m/s^2

(b). The magnitude of the net force is 232.9 N.

4 0
3 years ago
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