Which statement describes how the photoelectric effect causes an electric
current to form?
O A. Light acts as particles, causing electrons on the surface it strikes
to be destroyed.
B. Light acts as a wave, causing electrons to flow in different
directions within an atom.
C. Light acts as particles, knocking electrons off the surface it
strikes.
O D. Light acts as a wave, causing electrons to flow from one atom to
another.

Answer:

Solution:

i) Heat supplied by heater = Heat gained by water = m * c*theta = 0.12Kg * 4200 * 10 = 5040Joules in 2 minutes.

ii) Power = Energy/time = 5040J/(2 * 60seconds) = 5040J/120seconds = 42Watts.

(iii) Heat supplied to the 70g of water = m * c * theta = 0.07Kg * 4200 * 9K = 2646J

(iv) Heat supplied by heater = Heat gained by 70g of water + Heat supplied to the metal vessel.

But,from our calculations above,

Heat supplied by heater = 5040J ......and

Heat supplied to the 70g of water = 2646J

.: substituting the values,we have that :

5040J = 2646J + Heat supplied to the metal vessel.

5040J - 2646J = Heat supplied to the metal vessel.

.: Heat supplied to the metal vessel = 2394J.

(v) Heat gained by metal vessel = Heat capacity of the vessel * theta.

2394J = Heat capacity of the vessel * 9K

.: Heat capacity of the vessel = 2394/9 = 266(Joule per Kelvin)

(vi) Using the formula:

Heat Capacity = mass * specific heat capacity

.: Specific heat capacity = Heat Capacity/mass = 266/0.55 = 484(Joules per Kilogram per Kelvin)

Explanation:

Answer:

b

Explanation:

Bears hibernate in the winter

NREM-1 got this off a website

Answer:

The mini Cooper will experience the greater force

Explanation:

Generally, a bulldozer has a greater mass compared to a Mini Cooper hence when both of these vehicles interact in an head on collision the Mini Cooper will experience a greater force because the bulldozer has a greater momentum

Answer:

The girl must sit 5 m on the other side of the seesaw.

Explanation:

Given;

mass of the boy, = 75 kg

mass of the girl, = 50 kg

distance of the boy from the pivot, = 2 m

let the distance of the girl from the pivot = d

    <-------------2m-------------><-------------d-------------->

-----------------------------------------------------------------------------------

     ↓                                  Δ                                   ↓

     75                                                                      50

Apply the principle of moment, about the pivot;

clockwise moment = anticlockwise moment

75 x 2 = 50 x d

150 = 50d

d = 150 / 50

d = 3 m

The distance of the girl from the pivot is 3 m.

Therefore, the girl must sit ( 2m + 3m ) on the other side of the seesaw.

Answer: C. rapid evaporation of water in the soil :)

A possible result of higher air temperatures caused by global warming is rapid evaporation of water in the soil.

Global warming is a phenomenon that has been registered around the world during the last decades. It refers to a progressive increase in the average temperatures of the oceans and the Earth's atmosphere, which has consequences for flora and fauna, in addition to impacting critical sectors such as agribusiness.

Among the consequences of global warming are melting ice, rising sea levels, desertification, changes in rainfall, floods and reduced biodiversity.

See more about global warming at brainly.com/question/12908180

Answer:

See the answer below.

Explanation:

The latent heat of fusion is defined as the amount of energy needed to make a phase change from solid to liquid. And it can be calculated by means of the following expression:

[tex]Q_{fusion}=m*Dh[/tex]

where:

Qfusion = Heat Energy [J]

m = mass = 0.65 [kg]

Dh =  latent heat fusion = 330000[J/kg]

[tex]Q_{fusion}=0.65*330000\\Q_{fusion}=214500[J][/tex]

2)

We know that energy can be calculated from power, where power is defined as the relationship between energy over time.

[tex]P=E/t[/tex]

where:

P = power = 60 [w]

E = energy [J]

t = time = 5 [min] = 300 [s]

[tex]E=P*t\\E=50*300\\E=15000[J][/tex]

The mass change due to the process is equal to:

[tex]m=282-274\\m=8[g]=0.008[kg][/tex]

Now using the following equation for the latent heat of Fusion, we can calculate this value:

[tex]Q=m*Dh\\Dh =Q/m\\Dh=15000/0.008\\Dh=1875000[J/kg][/tex]

Answer:

because liquid and solid states of water possesses intermolecular force of attraction which held the molecules of water in fixed

Answer:75 ft east

Explanation:

Answer:

D, -8 F

Explanation:

This specific thermometer is in increments of two degrees per minor line and 10 per thicker line. Since the thermometer is showing below zero, the answer cannot be A or B since they are positive. -4 Cannot be the answer since the line addition does not make sense for that. It would be -4 if the thick line increments were 5 degrees instead of ten. Therefore if you count the lines by two from zero down to the thermometer line, you would get -8 Degrees F

Answer:

v = 1.5 m/s

Explanation:

m = 85 kg

p = 125 kg m/s

v = ?

p = m v

125 kg m/s = (85 kg) (v)

v = (125 kg m/s) / (85 kg)

v = 1.47 m/s

Answer:

One-dimensional

Explanation:

Answer:

416.6 KG

Explanation:

Due to the mass being missing from the equation you divide the force by the acceleration

Answer:

hello

Explanation:

The magnitude of the electrostatic force of attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them

Answer:

1.07 x 10⁻⁸N

Explanation:

Given parameters:

Mass 1 = 200kg

Mass 2  = 500kg

Distance of separation  = 25m

Unknown:

Gravitational attraction between the two bodies  = ?

Solution:

To solve this problem, we use the equation of the universal gravitation;

                 F  = [tex]\frac{G mass 1 x mass 2}{r^{2} }[/tex]  

G is the universal gravitation constant  = 6.67 x 10⁻¹¹Nm²kg⁻²

r is the distance

 Now insert the parameters and solve;

    F  = [tex]\frac{6.67 x 10^{-11} x 200 x 500 }{25^{2} }[/tex]   = 1.07 x 10⁻⁸N

Given:

Mass of objects,

Distance,

We know,

As we know the relation,

→ [tex]F_G = \frac{Gm_1m_2}{r^2}[/tex]

By substituting the values, we get

        [tex]= 6.67\times 10^{-11}\times \frac{200\times 500}{(25)^2}[/tex]

        [tex]= 1.0672\times 10^{-8} \ N[/tex]

Thus the above answer is right.

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Answer:

The bug will take 50 seconds to travel 55 m across the floor if it's traveling by 1.1 m / s​.

Explanation:

Given

Distance covered by bug = d = 55 m

The speed = s = 1.1 m/s

To determine

Time the bug will take to cover the distance = t = ?

Using the formula to determine the time the bug will take to travel 55 m across the floor if it's traveling by 1.1 m/s​.

Distance = Speed x Time

d = s x t

t = d/s

t = 55/1.1

t = 50 s

Therefore, the bug will take 50 seconds to travel 55 m across the floor if it's traveling by 1.1 m / s​.

Explanation:

Unbalanced Force causes acceleration.

But why?

This is because for accelerating a body we need unbalanced forces to move it.

Hope it helps :)

Explanation:

Given that,

Mass of the rider, m = 60 kg

Let the radius of the circle, r = 30 cm = 0.3 m

Let the velocity, v = 20 m/s

We need to find the centripetal force needed to keep the rider in a circular path. It can be given by :

[tex]F=\dfrac{mv^2}{r}\\\\F=\dfrac{60\times (20)^2}{0.3}\\\\F=80000\\\\\text{or}\\\\F=8\times 10^4\ N[/tex]

So, the required force is [tex]8\times 10^4\ N[/tex].

Answer:

The current flowing the heating element is 0.868 amperes.

Explanation:

Ohm's law states that voltage is directly proportional to current. In other, words, we say that:

[tex]V \propto R[/tex]

[tex]V = i\cdot R[/tex] (1)

Where:

[tex]V[/tex] - Voltage, measured in volts.

[tex]i[/tex] - Current, measured in amperes.

[tex]R[/tex] - Resistance, measured in ohms.

If we know that [tex]V = 230\,V[/tex] and [tex]R = 265\,\Omega[/tex], then the current that flows through the heating element is:

[tex]i = \frac{V}{R}[/tex]

[tex]i = \frac{230\,V}{265\,\Omega }[/tex]

[tex]i = 0.868\,A[/tex]

The current flowing the heating element is 0.868 amperes.

Explanation:

Given parameters:

Mass of the weight  = 15kg

Height of bar lift  = 0.25m

Number of times lifted  = 15times

Unknown:

Total height the bar was lifted  = ?

Force needed for the lift = ?

Work done  = ?

Solution:

To solve this problem we need to understand that;

        Work done  = Force x distance

         Work done = mass x acceleration due gravity  x height

         Work done  = weight x height

a. Total height:

   Total height  = 0.25 x 15  = 3.75m

b. Force needed ;

   Force needed  = Weight of bar  = mass x gravity

                                                        = 15 x 9.8 = 147N

 So;

    Force used for the 15 times  = 15 x 147  = 2205N

c. Work done ;

      Work done  = weight x height  = 2205 x 3.75  = 8268.75J

Answer:

Workdone = 1435.2N/m

Explanation:

Given the following data;

Mass = 240kg

Acceleration = 1.3m/s²

Distance = 4.6m

To find the force;

Force = mass* acceleration

Substituting into the equation, we have;

Force = 240 * 1.3

Force = 312N

Now, to find the workdone;

Workdone = force * distance

Workdone = 312 * 4.6

Workdone = 1435.2N/m

Answer:

The right characteristics to be used for the classification include:

-dense and solid

-very large  

-located near a star

Explanation:

The above listed characteristics are part of the characteristics used in classifying a planet as a habitable planet or non-habitable one. When a planet is closer to a star which revolves around it, this helps in supplying the needed light to it.

Answer:

dense and solid

located near a star

Explanation:

Answer:

How does energy travel?

One way the energy can travel is through radiation. An object can radiate energy in the form of electromagnetic waves, for example when a strong light is turned on and you can feel some heat coming from it, or when you walk under the sunlight and you can feel the heat in your skin.

Where is the initial source of energy in our solar system?

In the solar system, the source of energy comes from the Sun, and the sun irradiates that energy to all the nearby objects.

What is the process that gives off energy from the sun called?

The process is called radiation, this is all the energy that comes from the sun in the form of different electromagnetic waves (light in the visible range, UV rays, etc...)

Answer:

285.7s

Explanation:

Given parameters:

Speed of the person  = 1.4m/s

Unknown:

Time it takes to walk one time round the track = ?

Solution:

The circumference of the track is 400m for a standard pitch.

Now;

 Speed  = [tex]\frac{distance}{time}[/tex]

 Time  = [tex]\frac{distance }{speed }[/tex]  

 Now insert the parameters;

Time  = [tex]\frac{400}{1.4}[/tex]  = 285.7s

Answer:

dart

Explanation:

dart and sun and water so that the plant be okay

Answer:

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

Explanation:

hmmmmmmmmmmmmmmmmm ask someone else sorry if im not helping

The statement about the figure that is false is that d,ike K is older than layer I. That is option C.

Cross-cutting relationships is a principle that when a body pass through different layers in geology, it is usually younger than all the layers it passed through.

That is to say that, d,ike K is younger than layer I, D and B which it passed through.

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Answer:

If it's not C then it HAS to be B.

Explanation:

By deductive reasoning.