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4 years ago

Given equation is F=mv ×v/R what is the relationship exist between F and R?

1 answer:

8 0

This is called an "inverse" relationship because the bigger R becomes, the smaller F becomes as a result. you can do a couple of calculations on your calculator to see this (just increase R and watch what happens to F).

Also, when an equation has F = (x.y)/R^2 we call this the "inverse square" relationship, since it is also inverse, but squared. In practice it means that every time you double R, F decrease by 4 times! You will see this in physics a lot, so it's good to know!

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A balloon holds 20.0 L of helium at 10 degree Celsius. If the temperature doubles, and the pressure does not change, what will b

Natali [406]

To solve this we assume that the gas inside the balloon is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant pressure and number of moles of the gas the ratio T/V is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

T1 / V1 = T2 / V2

V2 = T2 x V1 / T1

V2 = 2 x 20.0/ 1

8 0

4 years ago

What part of the Milky Way allows for determination of its rotational direction? A. Celestial body B. Galactic body C. Galactic

Nitella [24]

Answer: C. Galactic disk

Explanation:

The part of the Milky Way which allows the determination of it rotational direction is known as the Galactic disk. This disc are shaped because they contain gases which are rich and dynamically young. It is also a part of a group of a galaxies disc is a component of disc galaxies, known as spiral galaxies and lenticular galaxies.

5 0

3 years ago

Read 2 more answers

A block of mass 3.20 kg is placed against a horizontal spring of constant k = 865 N/m and pushed so the spring compresses by 0.0

Aliun [14]

Answer:

a) The initial elastic potential energy of the block-spring system is 28.113 joules.

b) The final speed of the block is approximately 4.192 meters per second.

Explanation:

a) By applying Hooke's law and definition of work, we define the elastic potential energy ( $U_{g}$ ), measured in joules, by the following formula:

$U_{g} = \frac{1}{2}\cdot k\cdot x^{2}$ (1)

Where:

$k$ - Spring constant, measured in newtons per meter.

$x$ - Deformation of the spring, measured in meters.

If we know that $k = 865\,\frac{N}{m}$ and $x = 0.065\,m$ , then the elastic potential energy is:

$U_{g} = \frac{1}{2}\cdot \left(865\,\frac{N}{m} \right) \cdot (0.065\,m)$

$U_{g} = 28.113\,J$

The initial elastic potential energy of the block-spring system is 28.113 joules.

b) According to the Principle of Energy Conservation, the initial elastic potential energy of the block-spring system becomes into translational kinetic energy, that is:

$U_{g} = \frac{1}{2}\cdot m\cdot v^{2}$ (2)

Where:

$m$ - Mass, measured in kilograms.

$v$ - Final speed, measured in meters per second.

Then, the final speed is cleared:

$v = \sqrt{\frac{2\cdot U_{g}}{m} }$

If we know that $U_{g} = 28.113\,J$ and $m = 3.20\,kg$ , then the final speed of the block is:

$v = \sqrt{\frac{2\cdot (28.113\,J)}{3.20\,kg} }$

$v \approx 4.192\,\frac{m}{s}$

The final speed of the block is approximately 4.192 meters per second.

3 0

3 years ago

A lightbulb converts 10 percent of the electric energy it uses into radiant energy

katrin [286]

The rest of it is used up as unwanted energy or wasted energy in forms of:
.heat
.noise

7 0

3 years ago

The process of _____ is involved in the operation of all heat engines.

faltersainse [42]

The process of heat exchange is involved in the operation of all heat engines.

<u>Explanation:</u>

A heat engine refers as the system which converts thermal or heat and chemical energy into mechanical energy. Then, these can be utilised for mechanical work. This is done by raising the active substances from higher to lower temperature state. In simple words, it produces macroscopic movement from the heat.

For example, when people rub their hands, friction converts mechanical energy (the movement of our hands) into thermal energy (hands warm up). Heat engines work exactly the opposite; they take energy to warm up (in relation to the environment) and release it for movement. This movement is often transformed into electricity by a generator. It shows that there is exchange of heat involved in all of its processes.

8 0

3 years ago