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3 years ago

Why is it important to push a dolly instead of pulling it?

Engineering

2 answers:

AURORKA [14]3 years ago

7 0

Answer:

Because your legs are stronger than your arms Pushing keeps the weight of the dolly in your.Push rather than pull. Pushing a load is generally less stressful on your body because you use the weight of your body and maintain a more neutral posture.Use devices that reduce the coefficient of friction between the object being moved and the surface area.

Kazeer [188]3 years ago

4 0

Answer:

To maintain a more neutral body posture, and to ensure that you don't lose control of it.

Explanation:

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Consider a steam turbine, with inflow at 500oC and 7.9 MPa. The machine has a total-to-static efficiency ofηts=0.91, and the pre

sergiy2304 [10]

Answer: $\dot m_{in} = 23.942 \frac{kg}{s}$ , $\dot H_{out} = 39632.62 kW$

Explanation:

Since there is no information related to volume flow to and from turbine, let is assume that volume flow at inlet equals to $\dot V = 1 \frac{m^{3}}{s}$ . Turbine is a steady-flow system modelled by using Principle of Mass Conservation and First Law of Thermodynamics:

Principle of Mass Conservation

$\dot m_{in} - \dot m_{out} = 0$

First Law of Thermodynamics

$- \dot W_{out} + \eta\cdot (\dot m_{in} \dot h_{in} - \dot m_{out} \dot h_{out}) = 0$

This 2 x 2 System can be reduced into one equation as follows:

$-\dot W_{out} + \eta \cdot \dot m \cdot ( h_{in}- h_{out})=0$

The water goes to the turbine as Superheated steam and goes out as saturated vapor or a liquid-vapor mix. Specific volume and specific enthalpy at inflow are required to determine specific enthalpy at outflow and mass flow rate, respectively. Property tables are a practical form to get information:

Inflow (Superheated Steam)

$\nu_{in} = 0.041767 \frac{m^{3}}{kg} \\h_{in} = 3399.5 \frac{kJ}{kg}$

The mass flow rate can be calculated by using this expression:

$\dot m_{in} =\frac{\dot V_{in}}{\nu_{in}}$

$\dot m_{in} = 23.942 \frac{kg}{s}$

Afterwards, the specific enthalpy at outflow is determined by isolating it from energy balance:

$h_{out} =h_{in}-\frac{\dot W_{out}}{\eta \cdot \dot m}$

$h_{out} = 1655.36 \frac{kJ}{kg}$

The enthalpy rate at outflow is:

$\dot H_{out} = \dot m \cdot h_{out}$

$\dot H_{out} = 39632.62 kW$

3 0

3 years ago

Why less irrigation facilities in Telangana state give reasons

Paul [167]

Answer:

The irrigation area is less in Telangana because of drought conditions, uncertain rains, inadequate irrigation facilities, and lack of groundwater. 84% of agricultural land depends on borewell irrigation but just about 10% of arable land irrigated by canals and 4% of land depends on tanks.

3 0

3 years ago

) Assuming that the net environmental impact and all other considerations are equal to produce, package, and distribute both pro

DanielleElmas [232]

Answer:

biodegradable product

Explanation:

The biodegradable product will be the best product to buy on the market. This is due to the less harmful impact the product has on the environment. The plastics will degrade easily unlike the non-biodegradable products that are fossil fuel derivatives.

7 0

3 years ago

Python:

stira [4]

Answer:

# Python Program to Print

# all subsets of given size of a set

import itertools

def findsubsets(s, n):

return list(itertools.combinations(s, n))

# Driver Code

s = {1, 2, 3}

n = 2

print(findsubsets(s, n))

-----------------------------------------------

# Python Program to Print

# all subsets of given size of a set

import itertools

# def findsubsets(s, n):

def findsubsets(s, n):

return [set(i) for i in itertools.combinations(s, n)]

# Driver Code

s = {1, 2, 3, 4}

n = 3

print(findsubsets(s, n))

-------------------------------------------------------------

# Python Program to Print

# all subsets of given size of a set

import itertools

from itertools import combinations, chain

def findsubsets(s, n):

return list(map(set, itertools.combinations(s, n)))

# Driver Code

s = {1, 2, 3}

n = 2

print(findsubsets(s, n))

4 0

4 years ago

At what depth in water is the increased pressure five times greater than atmospheric pressure (101 kPa)?

umka21 [38]

Explanation:

40.4m

Explanation:

Pressure at depth is given as

P = P, + pgh

Final pressure at depth h= 5 Po

5Po= Po + pgh

pgh = 4Po = 4 x 1.01 x 10^5

h = (4.04×10^5)/ (1000x10)

h=40.4m

8 0

3 years ago