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2 years ago

10

PHYSICS 50 POINTS PLEASE HELP

2 answers:

babymother [125]2 years ago

7 0

Newton’s First Law of Motion - if an object is at rest, it takes un-

balanced forces to make it move. Conversely, if an object is moving

it takes an unbalanced force to make it change it’s direction or speed.

Newton was the first to see that such apparently diverse phenomena as a satellite moving near the Earth's surface and the planets orbiting the Sun operate by the same principle: Force equals mass multiplied by acceleration, or F=ma.

zaharov [31]2 years ago

4 0

Answer:

<em>PLEASE HELP</em>

HA

Explanation:

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2 years ago

Read 2 more answers

Air enters the compressor of a gas-turbine engine at 300 K and 100 kPa, where it is compressed to 700 kPa and 580 K.Heat is tran

Natasha2012 [34]

Answer:

- the fraction of the turbine work output used to drive the compressor is 50%

- the thermal efficiency is 29.6%

Explanation:

given information:

$T_{1}$ = 300 k

$P_{1}$ = 700 kPa

$T_{2}$ = 580 K

Qin = 950 kj/kg

efficiency, η = 86% = 0.86

Assume, Ideal gas specific heat capacities of air, $C_{p}$ = 1.005

k = 1.4

(a) the fraction of the turbine work output used to drive the compressor

Qin = $C_{p}$ ( $T_{3}$ - $T_{2}$ )

$T_{3}$ - $T_{2}$ = Qin / $C_{p}$

$T_{3}$ = Qin / $C_{p}$ + $T_{2}$

thus,

$T_{3}$ = $\frac{950 kJ/kg}{1.005 kj/kgK} + 580 K
[tex]T_{3}$ = 1525 K

$\frac{T_{4} }{T_{3} }$ = $(\frac{P_{4} }{P_{3} }) ^{k-1/k}$ \

$\frac{P_{4} }{P_{3} }$ = $\frac{P_{1} }{P_{2} }$

so,

$\frac{T_{4} }{T_{3} }$ = $(\frac{P_{1} }{P_{2} }) ^{k-1/k}$ \

$T_{4}$ = $T_{3}$ $(\frac{P_{1} }{P_{2} }) ^{k-1/k}$ \

= 1525 K $(\frac{100}{700} )^{1.4-1/1.4}$

= 875 K

$W_{in}$ = $C_{p}$ ( $T_{2}$ - $T_{1}$ )

= 1.005 kj/kgK (580 K - 300 K)

= 281.4 kJ/kg

$W_{out}$ = η $C_{p}$ ( $T_{3}$ - $T_{4}$ )

= 0.86 (1.005 kj/kgK) (1525 k - 875 K)

= 562.2 kJ/kg

therefore,

the fraction of turbine = $\frac{W_{in} }{W_{out} }$

= $\frac{281.4}{562.2}$

= 50%

(b) the thermal efficiency

η = ΔW/ $Q_{in}$

= ( $W_{out}$ - $W_{in}$ )/ $Q_{in}$

= $\frac{562.2}{281.4}$ /950

= 29.6%

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3 years ago

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grigory [225]

TºC + 273 :

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Answer B

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A cheetah can go from a state of resting to running at 20 m/s in just 2 seconds.

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Answer:

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Explanation:

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