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3 years ago

Which object experiences the greatest gravitational force? A)car B)fire truck C)plane D)human

Physics

1 answer:

Svetlanka [38]3 years ago

3 0

Answer: C Plane

Explanation: According to Newton's law, gravitational force is proportional to the product of masses and inversely proportional to the square of distance between them.

Gravitational force depends on mass. The bigger the mass, the more the magnitude of the gravitational force. Since plane is assume to have the highest mass in the options, we can therefore conclude that plane will experience the highest gravitational force.

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Determine the Reynolds number for a flow of 0.2 m^3/s through a 203 mm inner diameter circular pipe of a fluid with rho=680 kg/m

IrinaK [193]

To find a solution to this problem it is necessary to apply the concepts related to the Reynolds number and its definitions on the type of fluid.

A Reynolds number less than 2000 considers the laminar fluid, while a Reynolds number greater than 4000 is considered a turbulent fluid. (The intermediate between the two values would be a transient fluid)

The mathematical equation that defines the Reynolds number is given by

$Re = \frac{\rho V D}{\mu}$

Where

$\rho =$ Density

V= Velocity

D= Diameter

$\mu =$ Viscosity

Our values are given as

$Q = 0.2m^3/s$

$D = 203*10^{-3}m$

$\rho = 680kg/m^3$

$\mu = 3.1*10^{-4}Ns/m^2$

$\sigma = 0.022N/m$

The velocity can be find through the Discharge equation,

Q = VA

Where

V = Velocity

A = Area

Replacing,

$0.2 = V* (2\pi*(\frac{203*10^{-3}}{2})^2)$

$V = 3.08m/s$

Replacing at the Reynolds equation,

$Re = \frac{\rho VD}{\mu}$

$Re = \frac{680*3.08*203*10^{-3}}{3.1*10^{-4}}$

$Re = 1.37*10^6$

Since Reynolds' number is greater than 4000, then we consider this a turbulent fluid.

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4 years ago

What is the relationship between lightning and atoms?

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Answer:

C. Lighting is made of atoms

Explanation:

Everything is made of atoms that are, in turn, made out of charged particles. All charged particles come in one of two types: positive and negative (or plus and minus). The minus particles are the electrons, and the plus particles are the much heavier protons which are buried deep in the nucleus.

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Velocities of two bodies A and B are given in vectors notation as va =i+2j-3k and Vb=3i+2j-k what will be the relative velocity

ArbitrLikvidat [17]

Answer:

$V_{B/A}=2i+2k$

Explanation:

The relative velocity can be calculated by means of the difference between vector B minus vector A.

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