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4 years ago

Explain the role of energy in changes of state.

1 answer:

3 0

A liquid requires enthalpy of vaporization to transform into vapor or gas at its boiling point. Here the element absorbs heat from surroundings or heat source.

This energy is used in breaking the forces of attraction among the atoms and molecules of the element. The molecules get separated to higher distances. The energy is converted in to the kinetic energy of the molecules in gaseous form and into the internal energy in terms of the temperature of the gas.

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Bicyclists in the Tour de France do enormous amounts of work during a race. For example, the average power per kilogram generate

soldier1979 [14.2K]

Answer: a) work done = 3946429.5 J

b) work done = 943.22 nutritional calories

Explanation:

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3 years ago

A ball is launched from the ground with a horizontal speed of 30 m/s and a vertical speed of 30 m/s. How far horizontally will i

IceJOKER [234]

Answer:

It will travel Vx * t = 30 m/s * 2 s = 60 m

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3 years ago

Read 2 more answers

Consider two circular metal wire loops each carrying the same current I as shown below. In what r... Consider two circular metal

NeX [460]

Answer:

1) The magnetic field outside the loop is zero.

In region III the magnetic fields due to the two wire loops point in the opposite direction andhence cancel each other. Therefore the magnetic field is zero in region I, III and V

The diagram is attached

6 0

3 years ago

Change in inherited characteristics over time is called what?

adell [148]

Answer:

characteristics

Explanation:

Change in inherited characteristics over time is called what?Change in inherited characteristics over time is called what?Change iChange in inherited characteristics over time is called what?n inherited characteristics over time is called what?Change in inherited characteristics over time is called what?

Change in inherited characteristics over time is called what?Change in inherited characteristics over time is called what?Change in inherited characteristics over time is called what?

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2 years ago

A small airplane with full fuel tanks, but no occupants or baggage, has a mass of 1.17×103kg and a center of gravity that is 2.5

madam [21]

Answer:

141.13636 kg

Explanation:

$m_1$ = Mass of plane = $1.17\times 10^3\ kg$

$m_2$ = Maximum mass that the baggage compartment can hold

$m_3$ = Mass of person = 75 kg

$r_1$ = Distance between pilot and center of gravity

$r_2$ = Distance between baggage and center of gravity

$r_3$ = Distance between center of gravity with pilot and without pilot

As moment of the system is conserved we have the relation

$m_1r_1=m_2r_2+m_3r_3\\\Rightarrow m_2=\dfrac{m_1r_1-m_3r_3}{r_2}\\\Rightarrow m_2=\dfrac{1.17\times 10^3\times (2.76-2.58)-75\times (2.67-2.76)}{4.3-2.76}\\\Rightarrow m_2=141.13636\ kg$

The maximum mass that the baggage compartment can hold is 141.13636 kg

4 0

3 years ago