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Deffense [45]
3 years ago
12

A 60.0 kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. Wh

at is the pressure exerted by the floor over the area of contact in the following cases?
(a) if the dancer is stationary
(b) if the dancer is leaping upwards with an acceleration of 5.00 m/s2
Physics
1 answer:
Anit [1.1K]3 years ago
5 0

Answer:

Explanation:

Given

Mass of dancer m=60\ kg

Area of contact A=26\ cm^2

(a)If dancer is stationary

Pressure exerted by Floor is given by load per unit area of contact

P=\frac{weight}{A}

P=\frac{mg}{A}

P=\frac{60\times 9.8}{26\times 10^{-4}}

P=226.153 kN

(b)If dancer is leaping upwards with an acceleration of a=5 m/s^2

So apparent weight of dancer is W'=mg+ma

W'=m(g+a)=60\cdot (9.8+5)

W'=888\ N

Pressure=\frac{W'}{A}

Pressure=\frac{888}{26\times 10^{-4}}

=341.53\ kN      

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The Sun's layers consist of the following in this order.

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2) Transition Region

3) Chromosphere

4) Photosphere

5) Convection Zone

6) Radiative Zone

and last but not least 7) The Core

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In a certain region of space, the electric potential is V(x,y,z)=Axy-Bx^2+Cy , where A,B , and C are positive constants.a) Calcu
laiz [17]

Answer:

a)  Eₓ = - A y + 2B x , b)  Ey = -Ax –C , c) Ez = 0 , d) The correct answer is 3

Explanation:

The electric field and the electric power are related

                    E = - dV / ds

a) Let's find the electric field on the x axis

                  Eₓ = - dV / dx

                  dV / dx = A y - B 2x

                  Eₓ = - A y + 2B x

b) calculate the electric field on the y-axis

                Ey = - dV / dy

                dV / dy = A x + C

                Ey = -Ax –C

c) the electric field on the z axis

              dv / dz = 0

              Ez = 0

.d) at which point the electric field is zero

Since the electric field is a vector quantity all components must be zero

X axis

              0 = = - A y + 2B x

              y = 2B / A x

Axis y

             0 = -Ax –C

              .x = -C / A

We substitute this value in the previous equation

             .y = 2B / A (-C / A)

             .y = 2 B C / A2

The correct answer is 3

6 0
3 years ago
"18. Milliliter is equivalent to 1 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
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18 mililiter is equivilent to 0.0047551
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