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Butoxors [25]
2 years ago
14

Naomi is taking a train from DC to New York which is 360km apart. If the train is traveling at an average speed of 32 meters per

second, how much time will it take Naomi to get to new work
Physics
1 answer:
rodikova [14]2 years ago
4 0

Answer:

11250 seconds or 187.5 mins

Explanation:

The formula to be used here is that of speed.

Speed (in m/s) = distance (meter) ÷ time (secs)

The speed provided is 32 meters per second

The distance provided will have to be converted to meters; 360 km = 360 × 1000 = 360000 meters

Thus,

32 = 360000 ÷ time

time = 360000 ÷ 32

time = 11250 seconds or 187.5 mins

It will take Naomi 11250 seconds to get to New York

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the jet plane travels along the vertical parabolic path. when it is at point a it has speed of 200 m/s, which is increasing at t
givi [52]

Explanation:

Here is the complete question i guess. The jet plane travels along the vertical parabolic path defined by y = 0.4x². when it is at point A it has speed of 200 m/s, which is increasing at the rate .8 m/s^2. Determine the magnitude of acceleration of the plane when it is at point A.

→ The tangential component of acceleration is rate of increase in the speed of plane so,

a_{t} = v = 0.8 m/s^{2}

→ Now we have to find out the radius of curvature at point A which is 5 Km (from the figure).

dy/dx = d(0.4x²)/dx

         = 0.8x

Take the derivative again,

d²y/dx² = d(0.8x)/dx

          = 0.8

at x= 5 Km

dy/dx = 0.8(5)

         = 4

p = \frac{[1+ (\frac{dy}{dx})^{2}]^{\frac{3}{2} }   }{\frac{d^{2y} }{dx^{2} } }

now insert the values,

p = \frac{[1+(4)^{2}]^{\frac{3}{2} }  }{0.8}  = 87.62 km

→ Now the normal component of acceleration is given by

a_{n} = \frac{v^{2} }{p}

    = (200)²/(87.6×10³)

aₙ = 0.457 m/s²

→ Now the total acceleration is,

a = [(a_{t})^{2} +(a_{n} )^{2} ]^{0.5}

a = [(0.8)^{2} + (0.457)^{2}]^{0.5}

a = 0.921 m/s²

4 0
2 years ago
Which of these is most likely to lead directly to a black market?
Sloan [31]
The answer is C.rationing.

<span>♡♡Hope I helped!!! :)♡♡
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7 0
3 years ago
Read 2 more answers
Help pleaseeee my brainnn stopped working once again lol
Andrew [12]

Answer:

1c 2a 3b  

Explanation:

6 0
2 years ago
Read 2 more answers
If 1 gallon of a liquid weighs 4 pounds how much would one ounce weight (keep in mind that liquid ounces are different than weig
Bas_tet [7]

Answer:

64 ounces

Explanation:

Pound is the unit of mass in the imperial system of units.  It is used in the United States. Its calibration is done with the SI unit of mass which is kilogram. 1 lb =  0.45359237 kg

1 gallon = 4 pounds

1 pound = 16 ounces weight

So,

4 pounds = 16 × 4 = 64 ounces weight

So, 1 gallon is equal to 64 ounces weight.

1 gallon = 128 fluid ounces.

3 0
3 years ago
The membrane that surrounds a certain type of living cell has a surface area of 7.1 x 10-9 m2 and a thickness of 1.5 x 10-8 m. A
hoa [83]

Answer:

Q = +1.4 pC

Explanation:

  • The capacitance of any capacitor, by definition, is as follows:
  •  C = \frac{Q}{V} (1)
  • Applying Gauss'Law and the definition of electric potential, it can be showed that the capacitance of a parallel-plate capacitor can be expressed as follows:
  •  C = \frac{\epsilon_{r}*\epsilon_{0} * A}{d} (2)
  • Where εr is the dielectric constant of the material that fills the space between the plates, A is the area of one of the plates, and d, is the separation between them.
  • Replacing by the givens in (2) we can find the value of the capacitance C, as follows:

       C = \frac{\ 4.4*8.85e-12C2/N*m2*7.1e-9m2}{1.5e-8m} = 18.4e-12 F = 18.4 pF

  • Replacing the values of C and V in (1), we can solve for Q, as follows:

       Q = C*V = 18.4e-12 F* 75.9e-3 V = 1.4e-12 C = +1.4 pC

  • As the outer surface is at a higher potential that the inside surface, the charge on it must be positive, and is equal to +1.4 pC.
7 0
3 years ago
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