All categories

3 years ago

Describe a good level of body fat

Physics

1 answer:

m_a_m_a [10]3 years ago

6 0

Answer: a good level of body fat can be found using your weight and height as a reference.

Explanation:

You might be interested in

13. A transformer has a primary coil with 600 turns and a secondary coil with 300 turns. If the output voltage is 320 volts, wha

vivado [14]

His is a step down transformer since n(primary) is greater than n(seconcary). You relate the input voltage with the ouput voltage with the following equation:

Vout = n2/n1*Vin (n2/n1 is essentially your 'transfer function' that dictates what a specified input would produce) 

Solving the equation: 

Vin = Vout*n1/n2 = (320V)*(600/300) = 640 V 

This is checked by seeing if Vin is greater than Vout, which it is for a step down transformer.

5 0

3 years ago

State Ohms law in easy words

Alexus [3.1K]

Answer:

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

7 0

3 years ago

Read 2 more answers

Which practice will help prevent data loss in case of a computer malfunction?

Gnoma [55]

You should back-up your computer every few weeks (or as often as needed).

As soon as you suspect that your computer (or any other backup-able device) is too slow or "glitch-y" you should back-up your device before you lose any important files or data.

PREVENTING MALFUNCTION:
→ Always set your computer on a hard & flat surface.
→ Avoid downloading programs from unknown or non-trusted sources.
→ Avoid using your computer in a hot area.
→ Consider installing a virus/malware protection software on your computer.

8 0

3 years ago

Read 2 more answers

A piece of iron of mass 200g and tempreture 300°C is dropped into 1.00 kg of water of tempreture 20°C. Predict the final equilib

Alekssandra [29.7K]

Answer:

The final equilibrium T_{f} = 25.7[°C]

Explanation:

In order to solve this problem we must have a clear concept of heat transfer. Heat transfer is defined as the transmission of heat from one body that is at a higher temperature to another at a lower temperature.

That is to say for this case the heat is transferred from the iron to the water, the temperature of the water will increase, while the temperature of the iron will decrease. At the end of the process a thermal balance is found, i.e. the temperature of iron and water will be equal.

The temperature of thermal equilibrium will be T_f.

The heat absorbed by water will be equal to the heat rejected by Iron.

$Q_{iron} = Q_{water}$

Heat transfer can be found by means of the following equation.

$Q_{iron}=m*C_{piron}*(T_{i}-T_{f})$

where:

Qiron = Iron heat transfer [kJ]

m = iron mass = 200 [g] = 0.2 [kg]

T_i = Initial temperature of the iron = 300 [°C]

T_f = final temperature [°C]

$Q_{water}=m*C_{pwater}*(T_{f}-T_{iwater})$

Cp_iron = 437 [J/kg*°C]

Cp_water = 4200 [J/kg*°C]

$0.2*437*(300-T_{f})=1*4200*(T_{f}-20)\\26220-87.4*T_{f}=4200*T_{f}-84000\\26220+84000=4200*T_{f}+87.4*T_{f}\\110220 = 4287.4*T_{f}\\T_{f}=25.7[C]$

4 0

2 years ago

Frank says that quantum mechanics does not apply to baseballs because they do not jump from quantum state to quantum state when

Minchanka [31]

Answer:

They are correct

Explanation:

According to the uncertainty principle, the uncertainty in the position of an object is directly proportional to its De Broglie wavelength.

The De Broglie wavelength of a baseball is about $10^{-34}m$ , recall that the diameter of the atom is about to $10^{-10}m$ . Thus, the error in simultaneously determining the position and momentum of a baseball is infinitesimally small.

6 0

2 years ago