3. Which of the following processes provides the water necessary for human consumption?
O precipitation
O evaporation
O sublimation
O perspiration

Explanation:

The lower the level of resistivity the more electrical conductivity a metal has. Copper has low resistivity, and therefore is an excellent conductor. Copper is also less oxidative than other metals

Answer: 300 m/s

Explanation:

The equation for finding wave speed is the wavelength times the frequency which would be

12.0mx 25hz=300m/s

Answer:

Remember the relation:

Speed*Time = Distance.

Then first let's find the total distance that Hari drove.

First, he droves 2 hours at 60km/h, then the total distance traveled is:

Distance = 2h*60km/h = 120km

Then he droves 3 hours at 70km/h

The distance here is:

Distance = 3*70km/h = 210km

The total distance traveled is 120km + 210km = 330km

The total time of the travel is 2 hours  + 3 hours  = 5 hours.

The average speed is calculated as:

Av speed = (total distance)/(total time)

Av speed = (330km)/(5 h) = 66km/h

The average speed is 66km/h.

b) We know that the speed is 70km/h, but we want to write this in m/s.

Then we first know that 1 km = 1000m

then:

1 = (1000m/1km)

Then 70km/h = 70 km/h*(1000m/1km) = (70*1000) m/h = 70,000 m/h

Now we know that 1h = 3600 seconds, then:

1 = (1h/3600s)

So we can write:

70,000 m/h = (70,000 m/h)* (1h/3600s) = 70,000/3600 m/s = 0.019 m/s

and the distance is 135 km

Again, we can rewrite this as:

135km = 135km*(1000m/1km) = 135,000m

Then we want to solve:

(0.019m/s)*time = 135,000 m

We want to solve this for the time, then we get:

time = (135,000m)/(0.019m/s) = 7,105,263.2 seconds = 1.93 hours

Answer:

192.08J

19.6m/s

Explanation:

Since there will be no potential energy when the ball is on the ground, the change in potential energy is equal to the potential energy at the start when the ball is 19.6m above the ground.

PE=mgh

=(1)(9.8)(19.6)

=192.08J

v²=u²+2as, where v is the final velocity, u is initial velocity, a is acceleration and s is distance. Initial velocity is 0 since it starts at rest.

v²=u²+2as

v²=0²+2(9.8)(19.6)

v=√384.16

=19.6m/s

Answer:

a) Option D

b) Option A

Explanation:

a) Option D

Because a massive car will have more inertia which will make the car move faster but a massive car simultaneously will have more friction thereby restricting its movement in the forward direction. Hence, all the three cars will move equal distance.

b) Option A, Car F

Being most massive car, the frictional force required to stop the car will be highest.  

If a rock is thrown into the air, the increase in the height would increase the rock’s kinetic energy, and then the increase in the velocity as it falls to the ground would increase its potential energy. _ This is false statement.

When a particle is hurled obliquely near the surface of the earth, it travels along a curved path while accelerating continuously in the direction of the planet's center (we assume the particle stays close to the surface of the globe). Such a particle's motion is known as projectile motion, and its route is referred to as a projectile.

In projectile motion total energy is conserved. Hence, when a rock is thrown into the air, the increase in the height would increase the rock’s potential energy, and then the increase in the velocity as it falls to the ground would increase its kinetic energy.

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Answer:

It's True...................

Answer:

T_f = 44.6 ° C

Explanation:

We can solve this exercise using the calorimetry relations

          Q = m c_e ΔT

          ΔT = [tex]\frac{Q}{m \ c_e}[/tex]

let's calculate

          ΔT = -7.96 10⁴ /(0.625 4186)

          ΔT = -3.04 10¹

The negative sign indicates that the temperature decreases

the temperature variation is

          T_f - T₀ = ΔT

          T_f = T₀ + ΔT

          T_f = 75.0 - 30.4

          T_f = 44.6 ° C

Answer:

22.8°

Explanation:

Given conditions:

When light beams to the east it is inclined at 3 degrees upwards

When the light beams points to the north it is inclined 10 degrees upwards

Determine the maximum angle of elevation of the light beam

let slope of the line ( m ) = tan ∅

In x-direction ( eastwards ) = df / dx = tan 3°

In y-direction ( north ) = df / dy = tan 10°

| νf | = | < tan 3° , tan 10° > |

therefore  | νf | = [tex]\sqrt{(tan 3)^2 + (tan10)^2}[/tex]

               | νf | = [tex]\sqrt{0.02032 +0.42037 }[/tex]  =  √ 0.44069 = 0.42037

hence the maximum angle of elevation = tan^-1 ( 0.42037 )  =  0.39794 rad

to degrees = 22.8°

The maximum angle of elevation of the light beam will be 22.8°. An elevation is its altitude beyond or below a specified reference point, It is calculated in degrees.

An elevation is its height above or below a fixed reference point, It is measured in degrees.

The given data in the problem is;

Angle inclined when light beams to the east = 3° upwards

Angle inclined light beams point to the north =  10° upwards

m is the slope of the line  = tan ∅

The maximum angle of elevation of the light beam is found as;

The angle inclined in the x and y-direction;

In x-direction ( eastwards ) = df / dx = tan 3°

In y-direction ( north ) = df / dy = tan 10°

The resultant angle of both the above angle is;

[tex]\rm v_f = \sqrt{(tan3^0)^2 +(tan 10^0)^2 } \\\\ \rm v_f = \sqrt{(0.020320)^ +(0.42037) } \\\\ \rm v_f = \sqrt{0.44069 \\\\[/tex]

[tex]\rm v_f = 0.42037[/tex]

[tex]\rm \theta= tan^-1 (v_f) \\\\ \rm \theta= tan^-1 (0.42037) \\\\ \rm \theta= 22.8 ^0[/tex]

Hence the maximum angle of elevation of the light beam will be 22.8°.

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Answer: C. Radio-controlled toy airplane

Explanation:

Just did the quiz

Radio-controlled toy airplane technologies would produce the least energy in light waves. Hence option C is correct.

Energy of the electromagnetic wave is directly proportional to frequency of the light wave. This relation is given by, E =hυ where h is planks constant and υ is frequency of light wave.

Remote of the radio controlled toy airplane produces radio waves to communicate between remote and the plane. Radio wave have high wavelength and low  frequency, hence it has least energy as compare to UV light and and microwave light.  Ultraviolet disinfecting wand produces ultraviolet light whose frequency is high than the microwave and radio waves.

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Answer:

Philip Gbeho

Explanation:

Answer

A. Half elementary charge

Explanation:

Answer: $43400 per year

Explanation:

The Data set of hypothetical salaries is given as:

$46,000 per year,

$20,000 per year,

$33,000 per year,

$27,000 per year,

$91,000 per year.

The average salary per year will be the addition of the salaries per year above which will then be divided by 5. This will be:

= ($46,000 + $20,000 + $33,000 + $27,000 + $91,000) / 5

= $217000/5

= $43400 per year

The average salary per year will be $43400

We have that In looking for an association between  these two variables, Jorge should utilize the

Correlational Research

This a research method that focuses on two variant variable and uses statistics to analyse the to achieve desired result

From The options  we have that

a Correlational Research

This a research method that focuses on two variant variable and uses statistics to analyse the to achieve desired result

b. Ethnographer Research

This is simply the a Research method that focuses on variable mostly people in the Natural habitat and studies them or conversations with them for best results

c. Naturalistic observation Research

This method of research focuses on people in the Natural environment to determine their mental State .It is use mostly by Psychologists

d. Case study Research

This is is the use of real life testimonies to develop results to a particular Research it entails the study of Past events.

In conclusion the different variables

Having understood the different methods

In looking for an association between  these two variables, Jorge should utilize the

Correlational Research

This a research method that focuses on two variant variable and uses statistics to analyse the to achieve desired result

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Answer:

25000m/s

Explanation:

V=fd

V=(500)(50)

V=25000m/s

Ans

Sep 19, 2019 — Wave speed is the distance a wave travels in a given amount of time, such as the ... Wave speed is related to both wavelength and wave frequency. ... The equation for wave speed can be used to calculate the speed of a wave when both ... Frequency = SpeedWavelength or Wavelength = SpeedFrequency.

Explanation:

Hey,

This is a complicated question that would be debated by many physicists. How to answer this question when we are struggling with the genesis of the universe? Many theories on the origin of the universe have been put forward, but the Bing Bang is probably, or at least to date, the most likely theory. If today the universe is expanding, some astronomers hypothesise that before the Bing Bang the universe already existed but that it was condensing, according to this hypothesis the Bing Bang would correspond to the limit point of compression of the universe.  

But if we remain in the traditional theory the Bing Bang is at the origin of all the matter we know, as well as light. Before the Bing Bang, in other words before the universe, there was NOTHING.

Answer: The atmosphere of trophic rainforest is hot and humid due to high rate of transpiration.

Explanation:

The tropical rainforest is a biome which exhibit rich biodiversity of plants and animals. The average temperatures in this region remain high with warm summer. It remains frost free. The soil is nutrient deficient. Due to hot temperature the rate of transpiration remains high as a result the concentration of the water vapors remain high. This is responsible for increasing the humidity in the atmosphere also this region receives appreciable amount of rainfall annually. The average rainfall range is 200-450 centimeters.

Answer:

I would say B

Explanation:

the other ones don't seem right

The frequency of oscillation of a mass on a spring is given by the equation:

[tex]f = 1 / (2π) * sqrt(k / m)[/tex]

[tex]k = (1 / (2π)^2 ) * (0.1^2) * 10 kg[/tex]

[tex]k = 0.158 N/m[/tex]

The spring constant of the spring is 0.158 N/m.

The spring constant, also known as the spring rate or rate constant, is a measure of the stiffness of a spring. It represents the amount of force (in newtons) required to compress or stretch a spring a certain distance (in meters) from its equilibrium position. The spring constant is a proportionality constant that relates the force applied to a spring to the resulting displacement.

The spring constant is an important property of a spring because it determines how much force is required to compress or stretch the spring a certain distance. A spring with a higher spring constant will be stiffer, and will require more force to compress or stretch it a certain distance, while a spring with a lower spring constant will be more flexible and will require less force to compress or stretch it a similar distance.

It is represented by the letter 'k', the unit of spring constant is N/m (Newton per meter). The greater the spring constant, the stiffer the spring is, and the less it will deflect for a given force.

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That other answer is untrustworthy. It's probably a POS troll.

The real answer: 4 N/m

Answer:

tgggggg

Explanation:

Answer:

Its liquid because when you pour water into different cups of different sizes its still the same shape

Answer:

a) Please see below as the answer is self-explanatory.

b) 1. vertically downward

   2. vertically upward

   3  N/A

   4  vertically downward.

Explanation:

a)

Answer:

the phenomenon of the interaction of electric currents or fields and magnetic fields.

Answer:

1.Contact because its a contact force

2 Contact because when the car is stopping it is coming in to contact with the ground.

3 non Contact because magnets don't need to have contact they pull

4 non Contact because its not a contact force

Answer:

P = 11666.6 W

Explanation:

Given that,

Work done by the motor, W = 3500 kJ

Time, t = 5 min = 300 s

We need to find the power developed by the motor. Power developed is given by :

[tex]P=\dfrac{E}{t}\\\\P=\dfrac{3500\times 10^3}{300}\\\\P=11666.7\ W[/tex]

So, the required power is 11666.6 W.

a temporary charge is the right answer

Answer:

It is the core.