A cube measures 3 cm on each side and has a mass of 25 g. What is its density.

Answer:

Dehydration could possibly take place if lost fluid is not replaced adequately. Hypothermia can not possibly take place due to loss of fluid. Nor can emphysema. So, dehydration looks to be the more suitable answer

Answer:

a) Ф = 1.79 eV  here are a number of electrons expelled from the metal and these electrons are accelerated by the difference in potential and you can establish a curren

b)  E = 1.14 eV     the energy of the photons is less than the work function of the metal, so there are no ejected electrons and there can be no current

Explanation:

a) This is a problem about the photoelectric effect, for the current to flow there must be ejected electrons so that they can be accelerated, this effect was explained by Insistent using

            h f = K - Ф

where hf is the energy of the incident photons, Ф the metal work function and K the kinetic energy of the ejected electrons, the minimum value that it can have is zero

           Ф = h f

let's use the relationship

           c = λ f

           f = c / λ

we substitute

          Ф = h c / λ

let's calculate

          Ф = 6.63 10⁻³⁴ 3 10⁸/694 10⁻⁹

          Ф = 2.87 10⁻¹⁹ J

let's reduce this value to units of eV

         Ф = 2.87 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)

         Ф = 1.79 eV

This is the maximum value that the work function can have for the electrons to be expelled, as they indicate that the work function of the anode is 1.3 eV there are a number of electrons expelled from the metal and these electrons are accelerated by the difference in potential and you can establish a current

B) The laser is changed for another λ = 1090 nm = 1090 10⁻⁹ m

Let's find the energy of the laser photons

         E = h c /λ

         E = 6.63 10⁻³⁴ 3 10⁸/1090 10⁻⁹

         E = 1.82 10⁻¹⁹ J

we reduce to eV

         E = 1.82 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)

         E = 1.14 eV

In this case, the energy of the photons is less than the work function of the metal, so there are no ejected electrons and there can be no current

Answer:

F = 19.42 [N]

Explanation:

In order to solve this problem, we must first make a free body diagram and determine the forces acting on each body. In the attached image we can see the respective free body diagrams with the respective equilibrium equations.

In order to determine the value of the force, a static analysis must be performed on the block of 2.9 [kg] so that the value of the Force F can be determined.

A coefficient of friction value between the block of 2.9 [kg] and the ground must be taken into account in order to find the force F. a coefficient of friction value of 0.2 shall be taken

By the sum of forces on the Y-axis equal to zero, the value of the normal force N can be determined on the block of 2.9 [kg].

Then knowing that the frictional force is equal to the product of the normal force by the coefficient of friction, we can determine the frictional force.

By the sum of forces on the X-axis equal to zero, we can determine the value of the Force F, as seen in the equations posed in the attached image.

Note: the value of the Force F depends on the value of the coefficient of friction between surfaces.

Answer:

1360*9.8

=13328 joules

Answer:

Stars are powered by nuclear fusion in their cores, mostly converting hydrogen into helium. The production of new elements via nuclear reactions is called nucleosynthesis. A star's mass determines what other type of nucleosynthesis occurs in its core (or during explosive changes in its life cycle).

cardiovascular endurance :))

Answer:

potential energy

Explanation:

Horizontal component , F cos θ.

Vertical component , F sin θ.

Now, as θ increases towards 90° cos θ decreases and

As θ increases towards 90° sin θ increases.

Therefore, horizontal component of F will decrease and vertical component will increase.

Hence, this is the required solution.

Answer:

a. less than, b. greater than, c. ahead

Explanation:

a. ) Is the velocity of car A  less than the velocity of car B b. the initial position of car A greater than the initial position of car B  c. ahead In the time period from t = 0 tot = 1 s, is car A ahead of car B?.

Velocity is the parameter which is different from speed,  can be defined as the rate at which the position of the object is changed with respect to time, it is basically speeding the object in a specific direction in a specific rate.

Velocity is a  vector quantity which shows both magnitude  and direction  and The SI unit of velocity is meter per second (ms-1). If there is a change in magnitude or the direction of velocity of a body, then it is said to be accelerating.

Finding the final velocity is simple but few calculations and basic conceptual knowledge are needed.

For more details regarding velocity, visit

brainly.com/question/12109673

#SPJ2

Recall that

[tex]{v_f}^2={v_i}^2+2a\Delta x[/tex]

where [tex]v_i[/tex] and [tex]v_f[/tex] are the skateboarder's velocity, respectively; [tex]a[/tex] is her acceleration; and [tex]\Delta x[/tex] is the change in her position.

Substitute everything you know and solve for [tex]v_f[/tex]:

[tex]{v_f}^2=\left(2.5\dfrac{\rm m}{\rm s}\right)^2+2\left(1.7\dfrac{\rm m}{\mathrm s^2}\right)(130\,\mathrm m)\implies v_f=448.25\dfrac{\mathrm m^2}{\mathrm s^2}\implies\boxed{v_f\approx21\dfrac{\rm m}{\rm s}}[/tex]

Answer:

1) If you put force on one side of an object, then there is an equal reaction.

2) Force on the firefly

3) Force saved

4) Will not move

Predator? like they hunt their prey

Answer:

prey

Explanation:

Answer:Magnetic fields are invisible, at least usually. But scientists from NASA's Space Sciences Laboratory have made them visible as "animated photographs," using sound-controlled CGI and 3D compositing.

Explanation:

Answer: 0.081  kilogram/cubic meter

Explanation: p=m/v so 104/1278 is 0.081377151799687 or 0.081.

Answer:

100km/h

Explanation:

96km•2.5=240km

240÷3/5=240•5/3=400km

400-240=160km

4.1-2.5=1.6h

160÷1.6=100km/h

Answer:

True

Explanation

the right shoes will help with the comfort & it will help with limits you have on your legs.. Weights, posture,& will help with injury...

Answer:

Explanation:

Hello friend!!!!!

The answer is 0 Newton

hope this helps

plz mark as brainliest!!!!!!!!!!

Answer:

50N

Explanation:

F =ma

m=10kg and a=5m\s^2

f= (10)*5

f= 50 N

Answer:

a) t1 = v0/a0

b) t2 = v0/a0

c) v0^2/a0

Explanation:

A)

How much time does it take for the car to come to a full stop? Express your answer in terms of v0 and a0

Vf = 0

Vf = v0 - a0*t

0 = v0 - a0*t

a0*t = v0

t1 = v0/a0

B)

How much time does it take for the car to accelerate from the full stop to its original cruising speed? Express your answer in terms of v0 and a0.

at this point

U = 0

v0 = u + a0*t

v0 = 0 + a0*t

v0 = a0*t

t2 = v0/a0

C)

The train does not stop at the stoplight. How far behind the train is the car when the car reaches its original speed v0 again? Express the separation distance in terms of v0 and a0 . Your answer should be positive.

t1 = t2 = t

Distance covered by the train = v0 (2t) = 2v0t

and we know t = v0/a0

so distanced covered = 2v0 (v0/a0) = (2v0^2)/a0

now distance covered by car before coming to full stop

Vf2 = v0^2- 2a0s1

2a0s1 = v0^2

s1 = v0^2 / 2a0

After the full stop;

V0^2 = 2a0s2

s2 = v0^2/2a0

Snet = 2v0^2 /2a0 = v0^2/a0

Now the separation between train and car

= (2v0^2)/a0 - v0^2/a0

= v0^2/a0

Answer:

Explanation:

This problem is based on oscillatory motion.

What is the period of oscillation?

This can be defined as the time taken to complete one full revolution or oscillation.

given that the  fly flaps its wings back and forth 25 times in one second. then the frequency is 25 Hz

we know that period T= 1/F

T= 1/25

T=0.04 sec

Answer:

As the public need for preventing injuries and deaths from car crashes became known, laws were enacted to mandate the inclusion of seat belts in almost all passenger vehicles

Explanation:

Correct on Ap3x

Answer:

D

Explanation:

Answer: 60 seconds

Explanation:

The following information can be derived from the question:

rt=d,

150r = 100

Divide through by 150

r = 100/150

r = 0.67

r = 0.67 feet/second

Fir the second part of the question,

100r=100

r = 100/100

r = 1

r= 1 feet/second

combined rate will now be:

= 0.67+1

= 1.67 feet/second

We then slot it back into the formula

rt = d

1.67t = 100

t = 100/1.67

t= 59.88 seconds

t = 60 seconds approximately

Answer:

c. potential

Explanation:

Answer:

d

Explanation:

We are required to write a statement that best describes the automobile's new motion.

The statement that best describes the automobile's new motion is uniform acceleration.

Motion is the change of position of a body or object with time.

Uniform Acceleration is defined as the motion of an object whose velocity increases by equal amounts in equal intervals of time, however small the time intervals may be.

The best statement to describe the automobile's new motion is called Uniform Acceleration

Read more:

https://brainly.com/question/20337199

Answer:

a)   I = 0.01029 A , b)   Q = 4074.05 J

Explanation:

a) Let's work in parts, let's start by looking for the energy consumed.

For this we use a rule of three or direct proportions if 1 kWh costs $ 0.09, how much kWh is $ 8.80

           Energy = 8.80 / 0.09

           Energy = 97,778 kWh

to calculate the current, we must have the energy consumed per second

Let's use a rule of three if 97,778 kWh were consumed in 24 h = 86,400 s how much was consumed in 1 s

            E₀ = 97.778 1/86400

            E₀ = 1.13168 Ws

the power consumed is

           P = E₀ / t

           P = 1.13168 / 1

           P = 1.13168 W

power is

           P = I V

           I = P / V

           I = 1.13168 / 110

           I = 0.01029 A

b) the heat is given by

as the efficiency is 100%

          E = P t = Q

          Q = 1.131368 3600

          Q = 4074.05 J

Answer:

weak forces are more close to loosing and strong forces are more close to wining

Explanation:

a weak force probably has less staingh than the stronger force hats probably because they don't get enough people to fight, they don't have strong weapons, or they are not getting medical treatment that probably means they are sick some may have a disease and can spread they may not have food water or other supplies.

Answer: They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.

Explanation: On Edgenuity!!

The comparison is best supported by the information given in option 4. They differ due to their atomic number.

A star is a bright spheroid of plasma held together by gravity. The Sun is the most distant star from Earth.

Many additional stars may be seen with the normal eye at night, but their enormous distance from Earth causes them to appear as stationary points of light in the sky.

We are discussing the two-element beryllium (Be) and barium (Ba). The comparison is best supported by this information will be;

They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.

Hence option 4 is correct.

To learn more about the beryllium refer to the link;

https://brainly.com/question/20669804

Answer:

  v = 6.05 10⁵ m / s

Explanation:

This is an exercise of the photoelectric effect, which consists of the emission of electrons from a metal by the action of incident light, this phenomenon was explained by Einstein, assuming that the light rays are composed of particular called photons, for which the process is can explain by the collision of two particles,

         h f = K + Φ

where hv is the energy of the photons, K the kinetic energy of the electrons and fi the work function of the metal

speed, wavelength and frequency are related by

          c = λ f

we substitute

        h c /λ = K + Φ

let's apply this expression to our problem

λ = 371 nm = 371 10⁻⁹ m

the kinetic energy of zero electrons K = 0

          h  c /λ = Ф

         Ф = 6.63 10⁻³⁴  3 10⁸/371 10⁻⁹

         Ф = 5.36 10⁻¹⁹ J

this value is constant since the metal does not change

for λ = 283 nm = 283 10⁻⁹ m

          K = hc /λ - fi

          K = 6.63 10⁻³⁴  3 10⁸/283 10⁻⁹ - 5.36 10⁻¹⁹

          K = (7.028 - 5.36) 10⁻¹⁹

          K = 1,668 10⁻¹⁹ J

the expression of kinetic energy is

          K = ½ m v²

          v = √ (2K / m)

          v = √(2 1,668 10⁻¹⁹ / 9,1 10⁻³¹)

          v = RA (0.36659 10¹²)

          v = 0.605 10⁶ m / s

          v = 6.05 10⁵ m / s