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3 years ago

Two difference between lever and pulley

Physics

1 answer:

Annette [7]3 years ago

7 0

Answer:

Differences can be :

1. Lever is onr of the six simple machines but pulley is a simple machine which has a wheel and axle .

2. Lever is of 3 types (first class , second class , third class ) but pulley is of only 2 types

I hope this helps you

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A centrifugal pump discharges 300 gpm against a head of 55 ft when the speed is 1500 rpm. The diameter of the impeller is 15.5 i

Ksivusya [100]

Answer: Question 1: Efficiency is 0.6944

Question 2: speed of similar pump is 2067rpm

Explanation:

Question 1:

Flow rate of pump 1 (Q1) = 300gpm

Flow rate of pump 2 (Q2) = 400gpm

Head of pump (H)= 55ft

Speed of pump1 (v1)= 1500rpm

Speed of pump2(v2) = ?

Diameter of impeller in pump 1= 15.5in = 0.3937m

Diameter of impeller in pump 2= 15in = 0.381

B.H.P= 6.0

Assuming cold water, S.G = 1.0

eff= (H x Q x S.G)/ 3960 x B.H.P

= (55x 300x 1)/3960x 6

= 0.6944

Question 2:

Q = A x V. (1)

A1 x v1 = A2 x V2. (2)

Since A1 = A2 = A ( since they are geometrically similar

A = Q1/V1 = Q2/V2. (3)

V1(m/s) = r x 2π x N(rpm)/60

= (0.3937x 2 x π x 1500)/2x 60

= 30.925m/s

Using equation (3)

V2 = (400 x 30.925)/300

= 41.2335m/s

To rpm:

N(rpm) = (60 x V(m/s))/2 x π x r

= (60 x 41.2335)/ 2× π × 0.1905

= 2067rpm.

6 0

3 years ago

Infrared radiation from young stars can pass through the heavy dust clouds surrounding them, allowing astronomers here on Earth

liberstina [14]

Answer:

λ = 1.86 x 10⁻⁴ m = 186 μm

Explanation:

The relationship between the wavelength and the frequency of a wave is given by the following equation:

$c = f\lambda\\\\\lambda = \frac{c}{f}$

where,

λ = wavelength of infrared radiation = ?

c = speed of infrared radiation = speed of light = 3 x 10⁸ m/s

f = frequency of infrared radiation = 1.61 THz = 1.61 x 10¹² Hz

Therefore,

$\lambda = \frac{3\ x\ 10^8\ m/s}{1.61\ x\ 10^{12}\ Hz}$

7 0

3 years ago

If matter cannot be created nor destroyed the how was matter created

Assoli18 [71]

It can’t be created nor destroyed although it can be changed from one form to the other

I hope this helps

Have a happy holidays:)

7 0

3 years ago

The radius of the circle traced out by the second hand on a clock is 6.00 cm. In a time t the tip of the second hand moves throu

quester [9]

Answer:

30.29 s

Explanation:

We are given that

Radius=r=6 cm

Length of an arc=l=19 cm

We have to find the value of t in seconds.

$\theta=\frac{l}{r}$

Substitute the values then we get

$\theta=\frac{19}{6}=3.17 rad$

We know that

1 minute=60 seconds

In 60 seconds ,second hand makes an angle= $2\pi$ radian

$2\pi$ radian made by second had in 60 sec.

1 radian made by second hand in $\frac{60}{2\pi}$ sec

3.17 rad made by second hand in $\frac{60}{2\pi}\times 3.17=\frac{60}{2\times 3.14}\times 3.17=30.29 s$

Hence, the value of t =30.29 s

5 0

4 years ago

What type of energy is present in lightning

kobusy [5.1K]

Thermal as well as electrical

4 0

4 years ago

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Two difference between lever and pulley​

Two difference between lever and pulley