Match the phrase with its explanation

magnets' persistent magnetic fields.Things that create their own persistent magnetic fields are known as permanent magnets.They have a north and a south pole and are built of magnetized ferromagnetic elements, such as iron and nickel.

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Answer:

d) 40000 kgm/s

Explanation:

The formula for momentum is p = m*v

so p = 100*400

p = 40000 kgm/s

Answer:

He should do a cool down exercise

Explanation:  not sure this is the answer your looking for :)

The aim of the experimental model is to test the effect of humidity (changes in weather) on evaporation (rates) from lakes

The control variables in an experiment are the variables that the experimenter intends to keep constant always so as to limit their effect on the measurements of the relationship between the dependent and the independent variable

Therefore in order to have a proper measurement of the effect of humidity on evaporation rate, other variables such as temperature, and the volume of the water in the experiment investigations which affect evaporation rate by the provision of heat, (temperature) and their heat capacity, (the volume and therefore, mass of water) should be controlled

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Answer: B: Volume of water and temperature

Explanation:

Just took the quiz

Answer:

Explanation:

Although we do have an equation for this in terms of one-dimensional motion, it's easy enough just to use the mathematical definition of acceleration:

[tex]a=\frac{v_f-v_0}{t}[/tex]  which says, in words, the acceleration of an object is equal to the objects final velocity minus its initial velocity, divided by the change in time. Since everything is given in m and s, our answer will be in m/s/s:

[tex]a=\frac{16.0-4.0}{4.0}[/tex] and

[tex]a=\frac{12.0}{4.0}[/tex] so

a = 3.0 m/s/s

Answer:

The total number of protons and neutrons in a nucleus.

Explanation:

I memorized it.

Answer:

Mass number of an atom is defined as the sum of the number of protons and number of neutrons.

Answer:

The correct option is (a).

Explanation:

Given that,

Current flowing through the resistor, R = 0.054 A

Resistance of the resistor, R = 15 ohms

We need to find the voltage. We know that, Ohm's law gives the relation between voltage, current and resistance i.e.

V = IR

Put all the values,

[tex]V=0.054 \times 15\\\\V=0.81\ V[/tex]

So, the required voltage is equal to 0.81 volts.

Answer:

remember the ways in which the heat is transferred:

Conduction: Heat transfer of two objects touching.

Convection: Heat transfer in a medium with a gradient of temperature.

Radiation: Heat transferred between two objects that not touch each other (an example of this is how the Sun heats up the Earth)

First, we start with the gas itself.

It has a lot of pressure, so when you open the knob, the gas can get out.

The has chemical potential energy.

When you combust the gas, you transform that energy into heat energy, as the flame touches the pot, it starts o also heat the pot.

This heat energy is transferred to the pot, which transfers heat energy to the water by conduction, the heat in the water is "distributed" by convection, and as the water starts to heat up, the energy is transferred to the egg by conduction.

Answer:

B

Explanation:

When the sun, moon, and Earth are in alignment at the time of the new or full moon, the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides both commonly called spring tides.

Answer:

D. Copper

Explanation:

Copper has the best electrical conductivity of any metal, except silver. A good electrical conductivity is the same as a small electrical resistance.

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9514 1404 393

Answer:

  5) 0.64Ω

  6) 0.16 W

Explanation:

Put the given numbers into the given formula and do the arithmetic.

5)

  [tex]\text{ohms}=\dfrac{\text{volts}}{\text{amps}}=\dfrac{0.32\text{ V}}{0.50\text{ A}}=\boxed{0.64\ \Omega}}[/tex]

__

6)

  [tex]\text{watts}=\text{volts}\times\text{amps}=(0.32\text{ V})\times(0.50\text{ A})=\boxed{0.16\text{ W}}[/tex]

Answer:

just ok02

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Answer:

As the voltage increases, the current flowing through the circuit increases while the resistance of the resistor remains constant.

Explanation:

Ohm's law states that the current flowing through a circuit is directly proportional to the applied voltage.

V = IR

where;

I is the current

R is the resistance

V is the applied voltage

Based on this law (Ohm's law), as the voltage increases, the current flowing through the circuit increases while the resistance of the resistor remains constant.

Answer:

https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/a/what-is-conservation-of-energy

Explanation:

Look at this website it gives you all the details! :)

Answer:

The Internal energy of the gas did not change

Explanation:

In this situation the Internal energy of the gas did not change and this is because according the the first law of thermodynamics

Δ U = Q - W  ------ ( 1 )

Δ U  = change in internal energy

Q = heat added

W = work done

since Q = W.  the value of ΔU  will be = zero   i.e. No change

Answer:

hello your question is incomplete attached below is the complete question

answer : Conduction, Lattice vibration  ( B )

Explanation:

The thermal transfer of energy occurs in a solid like a copper rod following two process therefore the second process and method are

Lattice vibration  and  conduction

Lattice vibration is the movement/oscillation of atoms in a solid and this is caused by the change/increase in temperature applied to the solid and these vibrations will lead to the thermal transfer of energy via conduction since the atoms are bounded together .

Answer:

i dont know the answer sir !

Explanation:

It is warmer in the winter and cooler in the summer in cities because water has high specific heat and therefore changes temperature more slowly than most other substances. The correct option is C.

Climate is the average weather over a longer period of time in a particular area. A description of a climate includes details such as the typical temperature in each season, the amount of rainfall, and the amount of sunshine.

Coastal weather tends to be more moderate than continental weather, with fewer hot and cold extremes, because the ocean warms and cools more slowly than the atmosphere.

The majority of rain clouds are produced by ocean evaporation, particularly in the tropics, which affects where wet and dry regions on land are located.

Therefore, the correct option is C. Water has a high specific heat and therefore changes temperature more slowly than most other substances.

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Answer:

The time taken for the commercial Jet liner to reach the end of its runway is 10.18 s.

Explanation:

Given;

average acceleration of the commercial Jet liner, a = 3g = 3 x 9.8 m/s² = 29.4 m/s²

distance traveled by the commercial Jet liner, s = 1542 m

The time taken for the commercial Jet liner to reach the end of its runway is calculated as follows;

s = ut + ¹/₂at²

where;

u is the initial velocity of the commercial Jet liner = 0

s = 0 + ¹/₂at²

s = ¹/₂at²

2s = at²

[tex]t = \sqrt{\frac{2s}{a} } \\\\t = \sqrt{\frac{2 \times 1524}{29.4} } \\\\t = 10.18 \ s[/tex]

Therefore, the time taken for the commercial Jet liner to reach the end of its runway is 10.18 s.

Answer:

Q1: c

Q2: a

Explanation:

you can tell the factors by looking at the formulas for kinetic and potential energy

for question 1  look at the formula for kinetic energy

[tex]KE=\frac{1}{2} mv^{2}[/tex]

the variables needed in order to calculate an object's kinetic energy are mass and velocity.

hence, when mass and velocity changes, kinetic energy changes, showing that mass and velocity are the factors affecting kinetic energy

same thing for the second question

[tex]PE = mgh[/tex]

as g (acceleration due to gravity) is considered constant (10 [tex]m/s^{2}[/tex] ) it will not be considered as a factor

and thus, the factors affecting potential energy are mass and height

Answer:

it can contaminate the water

Explanation:

I hope this helps ;)

Answer:12.583m/s

Explanation:

[tex]KE=\frac{1}{2}mv^{2}[/tex]

[tex]3800=\frac{1}{2}(48)v^{2}[/tex]

[tex]\frac{3800}{24}=v^{2}[/tex]

[tex]\sqrt{158.33} = v\\12.583m/s=v[/tex]

Answer:

im 99% sure its initial disturbance

Explanation:

Answer:

Work hasn't been done by Michael because no distance was covered.

Explanation:

Workdone is given by the formula;

[tex] Workdone = F * s[/tex]

Where;

W is the work done

F represents the force acting on a body.

s represents the distance covered by the body.

Hence, work hasn't been done by Michael because no distance was covered, as the table didn't move at all. Therefore, work done is zero.

Answer:

theyre used to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.

Explanation:

Metal cables are conductor of electricity but plastic rubber coating is insulator and can not conduct current. To avoid unnecessary flow of current and safely current transmission,  this material surrounds the metal cable.

Materials that easily permit the flow of electricity are referred to be electrical conductors. Conductivity is the quality of conductors that enables them to conduct electricity.

Insulators are substances that prevent electrons from freely moving from one elemental particle to another. The charge stays in the same spot and does not spread across the surface if we transfer any quantity of charge to such an element at any time.

Copper, aluminum, gold, and silver are a few examples of common conductors. Wood, rubber, plastic, and glass are a few typical insulators.

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Answer: It's 1 meat.

Explanation: Meat is a protein, bread and rice are grains, Apples are fruit!

Your welcome

Answer:

c

Explanation:

because what else can the laser be used for

Answer:

The answer is "22.05 pJ"

Explanation:

Using formula:

[tex]Energy=power\times time\\\\Power=Intensity \times area[/tex]

Calculating Energy:

[tex]=0.147 \times 2.5 \times 60 \times 10^{-12}\\\\=22.05\ pJ[/tex]