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3 years ago

Describe the working mechanism of a common hand pump.

1 answer:

5 0

Hand pumps are manually operated pumps; they use human power and mechanical advantage to move fluids or air from one place to another. They are widely used in every country in the world for a variety of industrial, marine, irrigation and leisure activities. There are many different types of hand pump available, mainly operating on a piston, diaphragm or rotary vane principle with a check valve on the entry and exit ports to the chamber operating in opposing directions.

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A child in a boat throws a 4.5kg package out horizontally with a speed of 13 m/s. Calculate the velocity of the boat immediately

Varvara68 [4.7K]

Answer:

0.78m/s

Explanation:

Now the momentum ensued by the boy throwing the package Is

Mass of package × velocity of package =4.5×13=58.5m/s

This momentum initiated a momentum on the boy-boat system

Total mass of the boy-boat system is 24+53=75kg

Let the velocity ensued by the boat be v.

Hence from conservation of momentum

58.5 =75×v

v= 58.5/75= 0.78m/s

4 0

4 years ago

An object is placed to the left of a convex mirror, such that the object-to-image distance is 140 cm.

labwork [276]

Answer:

The focal length of the mirror is 52.5 cm.

Explanation:

Given that,

Object to Image distance d = 140 cm

Image distance v= 35 cm

We need to calculate the object distance

$u = d-v$

$u = 140-35=105\ cm$

We need to calculate the focal length

Using formula of mirror

$\dfrac{1}{f}=\dfrac{1}{u}+\dfrac{1}{v}$

Put the value into the formula

$\dfrac{1}{f}=\dfrac{1}{-105}+\dfrac{1}{35}$

$\dfrac{1}{f}=\dfrac{2}{105}$

$f=52.5\ cm$

Hence, The focal length of the mirror is 52.5 cm.

6 0

4 years ago

A 2-kg ball falls from a table 2 meters off the ground. How fast will it be traveling just before it hits the ground?

nignag [31]

It will be 3 mph ______

6 0

3 years ago

A rope applies a horizontal force of 200 N to pull a crate a distance of 4 m across the floor. A frictional force of 90 N oppose

Svetach [21]

Answer:

A. 800 J

B. - 360 J

C. 440 J

Explanation:

Applied force, F = 200 N

Friction force, f = 90 N

Distance, d = 4 m

Work done = Force x distance x cos θ

where, θ be the angle between the force and distance.

A. W = Applied force x distance = 200 x 4 x cos0 = 800 J

B. W = frictional force x distance = 90 x 4 x cos 180 = - 360 J

C. Total work done = 800 - 360 = 440 J

6 0

3 years ago

Can anyone plz answer this?

Scrat [10]

Answer:

I would say C

Explanation:

A is a steep or about 45° angle while B appears to be a straight down angle of 0°. So if you take that into account, if you are subtracting A and B, it would be around in between. It will probably not be backwards because neither is facing to the left except the answer choices so B is wrong (the answer B).

R is even steeper than before, and if you are subtracting, it would probably be C.

7 0

3 years ago

Describe the working mechanism of a common hand pump.​

Describe the working mechanism of a common hand pump.