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3 years ago

Why would you wanna know a cure for all sickness.?

Physics

1 answer:

Alchen [17]3 years ago

4 0

Answer:

because if someone close to u gets sick you would know how to cure it

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What's the difference between (mu k) and (mu s)

Stolb23 [73]

(mu s) is the coefficient of kinetic friction, <span> (mu k) is a normal force,</span>

7 0

3 years ago

HELP ME ASAP PLEASE

padilas [110]

Answer:

( 1000 × 4 = 4,000) (800×3= 2400) (800×2=1600) the answer is 1600 hope it helps

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4 years ago

An object's mass refers to _____ and an object's weight refers to _____. Fill in each blank.

mamaluj [8]

Answer:

Explanation:

because the more mass it has the more dense it is

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3 years ago

A counterflow double-pipe heat exchanger is used to heat water from 20°C to 80°C at a rate of 1.2 kg/s. The heating is to be com

bixtya [17]

Answer:L=109.16 m

Explanation:

Given

initial temperature $=20^{\circ}C$

Final Temperature $=80^{\circ}C$

mass flow rate of cold fluid $\dot{m_c}=1.2 kg/s$

Initial Geothermal water temperature $T_h_i=160^{\circ}C$

Let final Temperature be T

mass flow rate of geothermal water $\dot{m_h}=2 kg/s$

diameter of inner wall $d_i=1.5 cm$

$U_{overall}=640 W/m^2K$

specific heat of water $c=4.18 kJ/kg-K$

balancing energy

Heat lost by hot fluid=heat gained by cold Fluid

$\dot{m_c}c(T_h_i-T_h_e)= \dot{m_h}c(80-20)$

$2\times (160-T)=1.2\times (80-20)$

$160-T=36$

$T=124^{\circ}C$

As heat exchanger is counter flow therefore

$\Delta T_1=160-80=80^{\circ}C$

$\Delta T_2=124-20=104^{\circ}C$

$LMTD=\frac{\Delta T_1-\Delta T_2}{\ln (\frac{\Delta T_1}{\Delta T_2})}$

$LMTD=\frac{80-104}{\ln \frac{80}{104}}$

$LMTD=91.49^{\circ}C$

heat lost or gain by Fluid is equal to heat transfer in the heat exchanger

$\dot{m_c}c(80-20)=U\cdot A\cdot$ (LMTD)

$A=\frac{1.2\times 4.184\times 1000\times 60}{640\times 91.49}=5.144 m^2$

$A=\pi DL=5.144$

$L=\frac{5.144}{\pi \times 0.015}$

$L=109.16 m$

6 0

3 years ago

During a practice shot put throw, the 7.9-kg shot left world champion C. J. Hunter's hand at speed 16 m/s. While making the thro

koban [17]

Answer:

a) a = 91.4 m / s², b) t = 0.175 s, c)

Explanation:

a) This is a kinematics exercise

v² = vox ² + 2a (x-xo)

a = v² - 0/2 (x-0)

let's calculate

a = 16² / 2 1.4

a = 91.4 m / s²

b) the shooting time

v = vox + a t

t = v-vox / a

t = 16 / 91.4

t = 0.175 s

c) let's use Newton's second law

F = ma

F = 7.9 91.4

F = 733 N

4 0

3 years ago