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4 years ago

I need extra help please guys help me

Physics

2 answers:

GaryK [48]4 years ago

7 0

I am sure the answer is letter c

tatiyna4 years ago

3 0

I would say point d. imagine the points as balls going around the sun. point d doesnt have as much accelaration since it just circled around the sun. then when it hits point a, it will gain accelaration. hope this helps.

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How can you identify a moveable pulley?

kolbaska11 [484]

B. it moves up and down with the load

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3 years ago

A cube at 101 °C radiates heat at a rate of 67 J/s. If its surface temperature is increased to 166 °C, the rate at which it will

igor_vitrenko [27]

Answer:

The rate at which it will radiate heat is closest to 127.2J.

Explanation:

According to Stefan's law, the heat radiated by a black body can be written as:

$\frac{dH}{dt}$ is directly proprtional to the $T^{4}$ .

where H is the amount of heat radiated and T is the surface temperature .

Example : The heat is transferred by radiation and an example of heat transferred by radiation is the sunlight reaching earth from sun.

Note : Here the temperature is expressed in Kelvin.

Initial rate of heat , $\frac{dH_{1}}{dt}=67J/s$

Final rate of heat , $\frac{dH_{2}}{dt}$ = unknown

Initial temperature , $T_{1}=374K$

Final temperature , $T_{2}=439K$

$\frac{H_1}{T_{1}^4}=\frac{H_2}{T_{2}^4}$

$H_{2}=67\times1.898$

$H_{2}=127.2$ .

The rate at which it will radiate heat is closest to 127.2J.

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3 years ago

Explain why air is not used as a brake fluid

Lelechka [254]

Answer:

A gas is not used in hydraulic machines as the fluid because gas is easily compressible and so if a gas is used, the energy would mostly go into compressing a gas. Therefore a liquid is used in hydraulic machines as the fluid.

Explanation:

I got you bro:)

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3 years ago

Is your textbook the kind of idealized object (described in section on radiation laws) that absorbs all the radiation falling on

MrMuchimi

In the textbook the kind of idealized object that described in section on radiation laws that it absorbs all the radiation falling for it because it is not giving off any radiation on its own. And about the black sweater worn by one of your classmates it goes the same.

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3 years ago

In a stadium, fans stand up and sit down to produce a wave across the stadium. This type of wave where the material travels perp

puteri [66]

Correct option B

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Hope This Helps You!

3 0

3 years ago

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