3 years ago

Here some free points

Engineering

2 answers:

Vanyuwa [196]3 years ago

6 0

Answer:

I will accept your friend request I hope you also follow me back

Semenov [28]3 years ago

5 0

Oh hehehhe yayayay yas in ssnsjd

You might be interested in

Early mountaineers boiled water to estimate their altitude. If they reached the top and found that water boiled at 89°C, approxi

algol [13]

Answer:

The height of the mountain is 4670.35 metres.

Explanation:

8 0

4 years ago

If a motorist moves with a speed of 30 km/hr, and covers the distance from place A to place B

Sergio039 [100]

Answer:

105 km

Explanation:

The motorist was going 30 km/hr, and it took 3 hours 30 minutes. That's 3.5 hours. 3.5×30=105

5 0

4 years ago

Question in Probability and Statistics 2<br>

Ghella [55]

Since we both have a question in same subject may u help me with this For a confidence level of 80% with a sample size of 21, find the critical t value

7 0

3 years ago

Consider an open loop 1-degree-of-freedom mass-spring damper system. The system has mass 4.2 kg, and spring stiffness of 85.9 N/

Marat540 [252]

Answer:

Damping ratio $\zeta =0.0342$

Explanation:

Given that

m=4.2 kg,K=85.9 N/m,C=1.3 N.s/m

We need to find damping ratio

We know that critical damping co-efficient

$C_c=2\sqrt {mk}$

$C_c=2\sqrt {4.2\times 85.9}$

$C_c=37.98$ N.s/m

Damping ratio( $\zeta$ ) is the ratio of damping co-efficient to the critical damping co-efficient

So $\zeta =\dfrac{C}{C_c}$

$\zeta =\dfrac{1.3}{37.98}$

$\zeta =0.0342$

So damping ratio $\zeta =0.0342$

3 0

4 years ago

A sample of wastewater is diluted 10 times. The diluted solution has an ultimate biochemical oxygen demand (BOD), Lo, of 30 mg/L

zzz [600]

Answer:

474.59 mg/L

Explanation:

Given that

BOD = 30 mg/L

Original BOD = 30 mg/L × dilution factor

Original BOD = 30 mg/L × 10 = 300 mg/L

$L_o = \frac{BOD}{1-e^{-5t}}$

here $L_o$ is the ultimate BOD ; BOD is the biochemical oxygen demand ; t = 0.20 /day

$L_o = \frac{300}{1-e^{-5(0.20)}}$

$L_o = 474.59 \ mg/L$

3 0

4 years ago