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3 years ago

12

What is melting? when an ice cube turns from a solid to a liquid, the particles

2 answers:

bagirrra123 [75]3 years ago

8 0

Answer:

Melting is the breaking of bonds between particles (atoms) due to the increase in temperature (energy).

Explanation:

When elements are in solid form, it means that the conditions they are in do not allow particles to move much, which creates stable bonds (stable bonds as in, difficult to break) between atoms.

↓

When the temperature increases, this atoms gain more and more energy (which makes them move) until bonds break and the transition from solid to liquid begins.

Hope it helped,

BioTeacher101

galina1969 [7]3 years ago

4 0

The ice cube which was solid has turned into the liquid water because the air temperature is warmer than the freezers. ... Therefore the ice particles have enough energy to break apart (melt)into smaller particle arrangements.

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What is the physical property of a star used to classify the stars by spectral type?

BigorU [14]

Answer:

Stellar Spectra Classification The patterns of lines detected in stellar spectra are used by astronomers to classify stars into spectral classes. These spectral classes are a measure of a star's surface temperature since the temperature of a star dictates which absorption lines are present in its spectrum.

Explanation:

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3 years ago

A ladder of length 10 is leaning against a wall. The vertical wall is frictionless while the horizontal surface is rough. The an

bogdanovich [222]

Answer:

105.1N

Explanation:

According to the newton second law

$\sum F_x = ma_x\\F_m - F_f = ma_x\\$

Since the acceleration is zero, then;

$F_m - F_f = 0\\Fm = F_f\\$

Since;

$F_m = mg sin \theta, \ hence \ F_f = mg sin \theta$

Given the following

mass of ladder m = 14kg

acceleration due to gravity g = 9.8m/s²

θ = 50°

Substitute

$F_f = 14(9.8)sin50\\F_f = 14(7.5072)\\F_f = 105.1N\\$

Hence the magnitude of the friction force (in N) exerted on the ladder in the point of contact with the horizontal surface is 105.1N

8 0

3 years ago

A gas-turbine power plant operating on the simple Brayton cycle has a pressure ratio of 7. Air enters the compressor at 0°C and

Ivahew [28]

Answer:

Answers of the Both parts are in the following attachment

Explanation:

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3 years ago

A helicopter lifts a 72 kg astronaut 15 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/

NemiM [27]

Answer:

a) $F_H=776.952\ N$

b) $F_g=706.32\ N$

c) $v=5.4249\ m.s^{-1}$

d) $KE=1059.48\ J$

Explanation:

Given:

mass of the astronaut, $m=72\ kg$

vertical displacement of the astronaut, $h=15\ m$

acceleration of the astronaut while the lift, $a=\frac{g}{10} =0.981\ m.s^{-2}$

a)

<u>Now the force of lift by the helicopter:</u>

Here the lift force is the resultant of the force of gravity being overcome by the force of helicopter.

$F_H-F_g=m.a$

where:

$F_H=$ force by the helicopter

$F_g=$ force of gravity

$F_H=72\times 0.981+72\times9.81$

$F_H=776.952\ N$

b)

The gravitational force on the astronaut:

$F_g=m.g$

$F_g=72\times 9.81$

$F_g=706.32\ N$

d)

Since the astronaut has been picked from an ocean we assume her initial velocity to be zero, $u=0\ m.s^{-1}$

using equation of motion:

$v^2=u^2+2a.h$

$v^2=0^2+2\times 0.981\times 15$

$v=5.4249\ m.s^{-1}$

c)

Hence the kinetic energy:

$KE=\frac{1}{2} m.v^2$

$KE=0.5\times 72\times 5.4249^2$

$KE=1059.48\ J$

8 0

3 years ago

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__________ forces are not equal, and they always cause the motion of an object to change the speed and/or direction of an object

mrs_skeptik [129]

Answer:

Unbalanced Forces.

Explanation:

6 0

3 years ago

Read 2 more answers