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IrinaVladis [17]
3 years ago
11

A person weighs 60 kg. The area under the foot of the person is 150 cm2. Find the pressure exerted on the ground by the person.

(Take g 10m/s2)
Physics
1 answer:
9966 [12]3 years ago
3 0

Answer:

40000 N/m²

Explanation:

Applying,

P =  F/A................... Equation 1

Where P = Pressure, F = Force, A = Area.

From the question,

The force(F) exerted by the person's foot is thesame as it's weight.

F = W = mg............ Equation 2

Where m = mass of the person, g = acceleration due to gravity.

Substitute equation 2 into equation 1

P = mg/A................ Equation 3

Given: m = 60 kg, g = 10 m/s², A = 150 cm² = (150/10000) m² = 0.015 m²

Substitute these values into equation 3

P = (60×10)/0.015

P = 600/0.015

P = 40000 N/m²

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nadya68 [22]

Answer:

Index of refraction=Angle of incidence/Angle of refraction

=5/2.1

=2.38

6 0
2 years ago
If a ball is thrown up at an initial speed of 40. m/s, how many seconds does it take to reach the top of its path?
natka813 [3]

Answer:

Time, t = 4.08 secs

Explanation:

<u>Given the following data;</u>

Initial velocity, U = 40m/s

To find the time, we would use the first equation of motion;

V = U + at

Where;

  • V is the final velocity.
  • U is the initial velocity.
  • a is the acceleration.
  • t is the time measured in seconds.

<em>Making time, t the subject of formula, we have;</em>

t = \frac{V - U}{a}

We know that acceleration due to gravity, g is 9.8m/s².

a = g = - 9.8m/s² because the ball is thrown in the opposite direction.  

Also, the final velocity is equal to zero (0) because the ball reached its maximum height.

<em>Substituting into the equation, we have;</em>

t = \frac{0 - 40}{-9.8}

t = \frac{-40}{-9.8}

Time, t = 4.08 secs

<em>Therefore, it will take the ball 4.08 seconds to reach the top. </em>

5 0
3 years ago
A paper filled capacitor is charged to a potential difference of 2.1 V and then disconnected from the charging circuit. The diel
Goryan [66]

Answer:

Part a)

V' = 7.77 Volts

Part b)

k' = 6.27

Explanation:

As we know that capacitor plate is connected across 2.1 V and after charging it is disconnected from the battery

So here we can say that charge on the plates will remain conserved

So we will have

Q = kC(2.1)

now dielectric is removed between the plates of capacitor

so new potential difference between the plates

V' = \frac{Q}{C'}

V' = \frac{kC(2.1)}{C}

V' = 3.7 \times 2.1

V' = 7.77 Volts

Part b)

Now the capacitor plates are again isolated and unknown dielectric is inserted between the plates

So again charge is same so potential difference is given as

V" = \frac{Q}{k'C}

0.59 V = \frac{kCV}{k'C}

0.59 = \frac{3.7}{k'}

k' = 6.27

5 0
3 years ago
30N of force is used to raise a box that weight 60N up an incline plane. What is the mechanical advantage of the incline plane?
Sati [7]
To calculate MA = force needed/force used
Example
MA = 60/30 = 2
The mechanical advantage is 2
3 0
3 years ago
State the law of conservation of momentum<br>​
trapecia [35]

Answer:

Law of conservation of momentum states that. For two or more bodies in an isolated system acting upon each other, their total momentum remains constant unless an external force is applied. Therefore, momentum can neither be created nor destroyed.

Explanation:

Hope it helps

8 0
3 years ago
Read 2 more answers
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