Explain why the temperature for freezing point and boiling point are the same.

Answers

Answer 1

Answer: We have to wonder what substance you're working with. Under normal, human environmental conditions, there are almost no substances that freeze and boil at the same temperature.

However, EVERY substance has SOME temperature, at some pressure, at which it "sublimes" ... passing directly from solid to gas, or from gas to solid, without existing in liquid form in between. Even water does that, if the conditions are right.

Answer 2

Answer: If you are referring to the rules of Celsius, that applies. Since the freezing point of water in Celsius is 0 degrees and the boiling point of water is 100 degrees, it can be said that the to share an equal distance from each other. (100-100=0 and 0+100= 100) You would have to gain or lose 100 so they both gave the same distance from each other.

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a 63 kg object needs to be lifted 7 meters in a matter of 5 seconds. approximately how much horsepower is required to achieve this task

Answers

Power is defined as the rate of doing work or the work per unit of time. The first step to solve this problem is by calculating the work which can be determined by the equation:

W = Fd

where:

F = force exerted = ma
d = distance traveled
m = mass of object
a = acceleration

Acceleration is equivalent to the gravitational constant (9.81 m/s^2) if the force exerted has a vertical direction such as lifting.

W = Fd = mad = 63(9.81)(7) = 4326.21 Joules

Now that we have work, we can calculate power.

P = W/t = 4325.21 J / 5 seconds = 865.242 J/s or watts

Convert watts to horsepower (1 hp = 745.7 watts)

P = 865.242 watts (1hp/745.7 watts) = 1.16 hp

work = mgh

power = mgh/t = 63•9.8•7/5 = 864 watts

1 HP = 746 watts

so that is 834/746 = 1.2 HP

How did mendeleev use hydrids in developing his table?

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When Mendeleev arranged the elements in order of increasing atomic mass, the properties where repeated. He corrected the known atomic masses of some elements and he used the patterns in his table to predict the properties of the elements he thought must exist but had yet to be discovered.

Atomic number equals the number of _______ or the number of ______. * giving brainly*

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Atomic number equals the number of protons or the number of electrons.

Since the ball slowly comes to a stop what does this mean about the net force on the ball as it rolls across the field?

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Since the speed of the bll is decreasing, there must be a net force
acting on it in the direction opposite to its motion.

Distinguish between "conduction", "convection" and radiation as related to heat transfer.

Answers

Conduction occurs when a substance is transferring heat via touching.
Convention occurs when the substance being heated begins a cycle of cooling and heating. the heat goes to the opposite side of which the substance is being heated and the substance is cooled on the corresponding side, this cycle continues until the heat source is extinguished.
Radiation occurs when the heat of a substance is being transferred via gas form. Ex: sunburn.

a rectangular coil of 25 loops is suspended in a field of 0.20wb/m2.the plane of coil is parallel to the direction of the field the dimensions of the coil are 15cm perpendicular to the field line and 12cm parallel to them what is the current in the coil if there is a torque of 5.4N.M acting on it