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4 years ago

7

When you first start a car after it has been sitting for more than an hour, it pollutes up to ......times more than when the eng

ine is warm.
10

2

20

5

2 answers:

lesya [120]4 years ago

6 0

20 time more then when it’s warm

Ainat [17]4 years ago

5 0

Has to be at most 20

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4 years ago

A 1020 CD steel shaft is to transmit 15 kW while rotating at 1750 rpm. Determine the minimum diameter for the shaft to provide a

vladimir2022 [97]

Answer:

diameter is 14 mm

Explanation:

given data

power = 15 kW

rotation N = 1750 rpm

factor of safety = 3

to find out

minimum diameter

solution

we will apply here power formula to find T that is

power = 2π×N×T / 60 .................1

put here value

15 × $10^{3}$ = 2π×1750×T / 60

so

T = 81.84 Nm

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4 years ago