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3 years ago

What is meant by cathode rays?what is radio activity and state three of it's effects?

Physics

1 answer:

stealth61 [152]3 years ago

5 0

1cathode rays plural : the high-speed electrons emitted in a stream from the heated cathode of a vacuum tube

2: a stream of electrons emitted from the cathode of a vacuum tube —usually used in plural

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Which pair of quantities represents scalar quantities

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Answer:

physical quantity that only has magnitude and no other characteristics.

Explanation:

so no velocity only magnitude

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3 years ago

A spring with spring constant 31 N/m is attached to the ceiling, and a 4.5-cm-diameter, 1.5 kg metal cylinder is attached to its

aalyn [17]

Answer:

0.315758099469 m

Explanation:

m = Mass of cylinder = 1.5 kg

$\rho$ = Density of water = 1000 kg/m³

V = Volume = Ah

A = Area = $\pi r^2$

k = Spring constant = 31 N/m

x = Displacement

g = Acceleration due to gravity = 9.81 m/s²

Here the forces are conserved

Weight of cylinder = Buoyant force + Spring force

$mg=\rho Vg+kx\\\Rightarrow mg=\rho Ahg+kx\\\Rightarrow 1.5\times 9.81=1000\times \pi(2.25\times 10^{-2})^2x\times 9.81+31x\\\Rightarrow 1.5\times 9.81=46.60213x\\\Rightarrow x=\dfrac{1.5\times 9.81}{46.60213}\\\Rightarrow x=0.315758099469\ m$

The length of the submerged cylinder is 0.315758099469 m

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4 years ago

The pressure exerted by a liquid column of depth 0.5 m on the base of its

Alik [6]

Answer:

1020.4kg/m³

35m³

Explanation:

Given parameters:

Depth = 0.5m

Pressure exerted = 5000N/m²

Unknown = density of the liquid = ?

Solution:

To find the density of this unknown liquid, we use the expression below:

Pressure of liquid = density x height x acceleration due to gravity

5000 = density x 0.5 x 9.8

Density = 1020.4kg/m³

Density of water = 1000kg/m³

Mass of water = 35000kg

Unknown:

Volume of water = ?

Solution:

The volume of water can be derived from the expression below:

Volume = $\frac{mass}{density}$

Volume = $\frac{35000}{1000}$ = 35m³

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3 years ago

Which actions are evidence that a chemical reaction has occurred? Select five options. a change in color the formation of a prec

vladimir1956 [14]

Answer:

A change in color

The formation of a precipitate

A clear liquid becoming cloudy

The formation of bubbles

The formation of smoke

Explanation:

A chemical reaction can be defined as the conversion of reactant into product. The process in which one or more than one substance is converted into one or many different substances.

There are some indications which can provide the evidence that chemical reaction has occurred.

A change in color of the substance, formation or smoke or bubbles. The formation of the precipitate and in case the substance becomes cloudy.

All these evidences show that chemical reaction has occurred.

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3 years ago

What is the last step to take in order to keep food safe?

gtnhenbr [62]

I think it would be clean and store.

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3 years ago

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What is meant by cathode rays?what is radio activity and state three of it's effects?​

What is meant by cathode rays?what is radio activity and state three of it's effects?