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Talja [164]
4 years ago
13

Consider a 1.72-m-tall man standing vertically in water and completely submerged in a pool. Determine the difference between the

pressures acting at the head and at the toes of this man, in kPa. The pressure difference acting between the head and toes of the man is kPa.
Physics
1 answer:
bazaltina [42]4 years ago
5 0

Answer:

Pressure difference between head and toes = 16872.2 Pa

Explanation:

The pressure difference between the head and toes of the man will be equal to the water pressure exerted at his toes. This can be found as follows:

Water pressure = (density of water) * (gravity) * (height of water)

Density of water = 1000 kg/m^3

Gravity = 9.81 m/s^2

Height of water = height of man = 1.72 m

Water pressure = 1000 * 9.81 * 1.72

Water pressure = 16872.2 Pa  

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A small button placed on a horizontal rotating platform with diameter 0.320 m will revolve with the platform when it is brought
Otrada [13]

Answer:

0.2687 approximately 0.27

Explanation:

Diameter = 0.320

Speed = 40.0 rev/min

We are required to find coefficient of static friction between friction and button

The radius can be calculated as

0.320/2

= 0.160m

Then we have the rotational speed w = 40rev/min x 2pi/60

= 4.19 rad/s

umg = mrw²

u = mrw²/mg

u = rw²/g -------(1)

g = 9.8

When we put values into equation 1

0.150m x 4.19² / 9.8

= 0.150m x 17.5561 /9.8

= 0.2689

This is approximately 0.27

6 0
3 years ago
Two friends of different masses are on the playground. They are playing on the seesaw and are able to balance it even though the
Westkost [7]

Answer:

They are able to balance torques due to gravity.

F_1 L_1 = F_2L_2

Explanation:

When two friends of different masses will balance themselves on see saw then at equilibrium position the see saw will remain horizontal

This condition will be torque equilibrium position where the see saw will not rotate

Here we can say

F_1 L_1 = F_2L_2

here we know that force is due to weight of two friends

and their positions are different with respect to the lever about which see saw is rotating

since both friends are of different weight so they will balance themselves are different positions as per above equation

5 0
4 years ago
A go-cart is traveling at a rate of 25 m/sec for 20 seconds. How far will the go cart travel?
notsponge [240]

Answer:

Distance travel by go-cart = 500 meter

Explanation:

Given:

Speed of go cart = 25 m/s

Time travel = 20 seconds

Find:

Distance travel by go-cart

Computation:

Distance = Speed x time

Distance travel by go-cart = Speed of go cart x Time travel

Distance travel by go-cart = 25 x 20

Distance travel by go-cart = 500 meter

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3 years ago
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2 years ago
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3 years ago
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