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Vedmedyk [2.9K]
3 years ago
7

At what distance above the surface of the earth is the acceleration due to the earth's gravity 0.855 m/s2 if the acceleration du

e to gravity at the surface has magnitude 9.80m/s2?
Physics
1 answer:
natulia [17]3 years ago
5 0
Given: Normal pull of gravity g = 9.8 m/s²; 

 g = 0.855 m/s²  (at a certain distance)

Universal gravitational constant G = 6.67 x 10⁻¹¹ N.m²/Kg²

Mass of the Earth Me = 5.98 x 10²⁴ Kg

Radius r = ?

g = GMe/r²

r = √GMe/g

r = √(6.67 x 10⁻¹¹ N.m²/Kg²)(5.98 x 10²⁴ Kg)/(0.855 m/s²)

r = 2.16 x 10⁷ m or 

r =  21,610 Km





.
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Scientists find the same type of index fossil in two different locations on Earth. What can they conclude from this discovery?
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The index fossils are the same geological age. Sorry if i'm wrong
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A student's room has a TV (250 W) ,heater (1150 W) and lamp (200 W) Electricity costs 10 fills per KWh. Calculate how much it wo
Yuki888 [10]

Answer:

Cost = 40 fills

Explanation:

First, we will calculate the total power consumed by all appliances:

Power = P_{TV}+P_{heater}+P_{lamp}\\Power = 250\ W+1150\ W+200\ W\\Power = 1600\ W = 1.6\ KW

Now, we will calculate the energy required:

Energy = (Power)(Time)\\Energy = (1.6\ KW)(2.5 h)\\Energy = 4 KWh\\

Now, for the cost we use the following formula:

Cost = (Energy)(Unit\ Cost)\\Cost = (4\ KWh)(10\ fills/KWh)\\

<u>Cost = 40 fills</u>

6 0
3 years ago
Solve a hollow steel shaft has an outside diameter of 100mm and inside diameter of 75 mm.the shaft is subjected to a pure torque
FrozenT [24]
  • The maximum shearing stress in hollow shaft is 66.125 MPa.
  • The magnitude of angle of twist is 0.0279 rad.
  • The power generated by the shaft is  157 kW.

<h3>What is power ?</h3>

Power in a rotating body like shaft is the product of Torque and the angular speed of that shaft.

P = Tω

The Torque is related to the shearing stress is

T = π/16 xτ(Do³ -Di³)

* Given is the Torque T= 7.5 kN.m, the inner diameter Di = 0.075m, outer diameter Do= 0.1m

Then, the maximum shearing stress will be

7.5 x 10³ =  π/16 xτ x (0.1³ - 0.075³)

τ = 66.125 MPa

Thus, the shearing stress is 66.125 MPa.

* From the Torque equation

T/J = Gθ/l

Where, J = π/32 (Do⁴ -Di⁴) = 0.00000671 m⁴

l = length of shaft = 2m, modulus of rigidity G = 80GPa = 80x 10⁹ Pa.

Substitute the values, we get the angle of twist

7.5 x10³ /0.00000671 = 80x 10⁹xθ/2

θ = 0.0279 rad.

Thus, the angle of twist is0.0279 rad.

* Power generated by the shaft is

P = 2πNT/60

where N = revolution/ minute = 200

Put the values, we get

P =  2π x 200 x 7500/60

P = 157 kW.

Thus, the power generated is 157 kW.

Learn more about power.

brainly.com/question/15120631

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5 0
2 years ago
An automobile can be considered to be mounted on four identical springs as far as vertical oscillations are concerned. The sprin
iogann1982 [59]

Answer:

Therefore, the spring constant of each spring =  1.6 × 10⁻⁶ kg/s².

Explanation:

The period (T) of a spring in oscillation = 2π √(m/k)............. equation 1

Where m = mass acting on the spring (kg), k = spring constant of the spring (kg/s²).

Making k the subject of  equation 1

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From the question, F = 4.42 Hz,

since  T = 1/F

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since the weight of the mass is evenly distributed over the four identical spring, Hence

m = 1450/4 = 362.5 kg

Substituting these values into equation 2

k = 0.226/{(4×3.143²)362.5}

k = 0.226/(14323.751)

k = 0.0000016 kg/s²

k = 1.6 × 10⁻⁶ kg/s².

Therefore, the spring constant of each spring =  1.6 × 10⁻⁶ kg/s².

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How you can speed up the dissolving process when preparing juice from frozen concentrate
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If you stir the juice it increases the surface area.

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