Please help me on this!!

Answer:

????

Explanation:

was their supposed to be a picture?

Explanation:

Since P=W/t

P= 40000/20

P= 2000 Watt(or)Joule per sec

Answer:

7.35m/s²

Explanation:

From the question we are not told what to find but we can as well find the acceleration of the wagon.

According to newton second law of motion

[tex]\sum F_x = ma_x\\Fm - Ff = ma_x\\Fm - \mu R = ma_x\\Fm- \mu mg = ma_x\\[/tex]

Fm is the moving force = 410N

[tex]\mu[/tex] is the coefficient of friction = 0.18

m is the mass = 45kg

g is the acceleration dur to gravity = 9.8m/s²

a is the acceleration of the wagon

Substitute the given data into the equation ang get ax

[tex]Fm- \mu mg = ma_x\\410 - (0.18)(9.8)(45) = 45a_x\\410 - 79.38 = 45a_x\\330.62 = 45a_x\\a_x = 330.62/45\\a_x = 7.35m/s^2\\[/tex]

Hence the acceleration of the wagon is 7.35m/s²

Answer:

With more particles there will be more collisions and so a greater pressure. The number of particles is proportional to pressure, if the volume of the container and the temperature remain constant. ... This happens when the temperature is increased.

Explanation:

Assuming the gas to be an ideal gas, the temperature will increase at the same rate as the pressure increases.

Let us assume that the gas in the container is an ideal gas. Then from the ideal gas equation, we get that:

PV = nRT

where P is the pressure of the gas

V is the volume

T is the temperature

n is the number of moles of the gas

R  is the universal gas constant

Now, it is given that V is constant, R is already a constant, and n will also be constant, since the number of moles of gas in the container is not changing, so:

P = nRT/V

P = constant × T

P/T = constant

This means that the temperature will increase at the same rate as the pressure increases.

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Explanation:

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Answer:

Pressure will be: 1470 Pa  

Explanation:

Given

We know that

Pressure = Force / Area

Force = mg = (75kg) (9.81 m/s²) = 735 N

Thus,

Pressure = Force / Area

               = 735 / 0.5

                = 1470 Pa             ∵N/m² = Pa

Thus,

Pressure will be: 1470 Pa  

Answer:

D) it is one of many galaxies

Explanation:

the milky-way galaxy is just one of billions of galaxies, which span billions and billions of light-years across the universe!!!

Answer:

D it is one of many

Explanation:

Answer:

The most correct option here is B

Explanation:

Models are usually used in science in order to proffer or explain difficult concepts of the real/actual "subject". The model to be used must have some level of similarity (usually high) with the actual subject. The use of model helps to explain how certain things work in the actual subject. Actual subjects are sometimes eventually used later after convincing experiments (showing "positive" results) must have been done on the model.

From the explanation above, it can be deduced that the correct option is B

The answer is, D. defined 3 x 4

Explanation:

But the only problem is, product A is not 3 x 4.

Product A is 2 x 3, so to make this a clear answer: Product B is D. defined 3 x 4 and Product A is A. not defined or alternate answer 2 x 3

Answer:

m = 35 g = 0.035 kg

Explanation:

The amount of heat required by a specific mass of wax to be melted at its melting point can be given by the following formula:

[tex]Q = mL[/tex]

where,

Q = Heat Supplied by the Heater = 7700 J

m = mass of wax melted = ?

L = Latent Heat of Fusion of Wax = 220 J/g

Therefore,

[tex]7700\ J = m(220\ J/g)\\m = \frac{7700\ J}{220\ J/g}\\\\[/tex]

m = 35 g = 0.035 kg

Answer:

its a liquid

Explanation:

liquid means water water means liqiud without them we cannot survive we need to be healthy we should bath we should drink more amount of water

F = m × a

300N = 100kg × a

a = 300 : 100

a = 3ms-²

F = Force (N)

m = mass (kg)

a = acceleration (ms-², m/s²)

Explanation:

object made of rubber, such as the ballons are elecrical insulators, meaning that they resist electric charges flowing through them..

when the ballon has been rubbed enough times to gain a sufficient negative charge, it will be attracted to the wall

Explanation:

Using Cosine rule, we have 5² = 3² + 4² - 2(3)(4)(cosx).

=> cosx = 0, x = 90°.

The International System of Units is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world.

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Newton's first and second laws of motion both do, but I think the one you're looking for is: The First Law of Motion.  That description is a little more direct.

It says that if an object is not acted on by a net external force, then it continues in "constant, uniform motion".

Answer:

Concept: Physical Constants

The difference between Length and Time is: Length is a measure of distance while Time is a quantity or measure of period.

Length can defined as a fundamental quantity that describe the total space occupied by an object from end to end or the distance of an object from end to end.

Time can be defined the duration of an occurrence in space. Time is so important as it helps us adequately know the period of an event or occurrence.

In conclusion, The difference between Length and Time is: Length is a measure of distance while Time is a quantity or measure of period.

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The ball accelerates from rest to 75.0 m/s in a matter of 0.020 s, so the drive applies an (average) acceleration of

a = (75.0 m/s - 0) / (0.020 s) = 3750 m/s²

Assuming this acceleration was constant, then the net force F on the ball is

F = (0.050 kg) (3750 m/s²) = 187.5 N ≈ 190 N

Answer:

Height of cliff(h) = 80 meter (Approx)

Explanation:

Given:

Time taken t = 4 sec

Gravitational acceleration = 10 m/s (Approx)

Find:

Height of cliff(h)

Computation:

h = ut + 1/2(g)(t)²

Height of cliff(h) = (0)(4) + 1/2(10)(4)²

Height of cliff(h) = 80 meter (Approx)

Answer:

C

Explanation:

When a substance is changing state, the heat supplied does not result in a rise in temperature. This is why, the heat supplied during change of state is referred to as 'latent heat'.

Latent heat is a heat that causes a change of state without a corresponding rise in temperature. During this time, the intermolecular bonds in the substance are broken.

Change of state will occur as regions in which there is no change in temperature with time such as point D on the graph.

Answer:

C

Explanation:

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Answer:

Explanation:

Using the formula for heart capacity;

Q = mcΔt

m is the mass = 150g = 0.15kg

initial temperature = 22°C

Quantity of heat = 3240J = 3.24kJ

specific heat capacity of ethanol = 2.57 [kJ/kg K]

Substitute and get the final temperature

3.240 = 0.15(2.57)(T - 22)

3.240 = 0.3855(T-22)

3.240/0.3855 = T - 22

8.405 = T - 22

T = 22+8.405

T = 30.405°C

Hence the final temperature of the ethanol if 3240 J was needed to raise the temperature of the ethanol is 30.405°C

Take east to be the positive direction. Then the resultant force from adding F₁ and F₂ is

F₁ + F₂ = (-45 N) + 63 N = 18 N

which is positive, so it's directed east.

To this we add a third force F₃ such that the resultant is 12 N pointing west, making it negative, so that

18 N + F₃ = -12 N

F₃ = -30 N

So F₃ has a magnitude of 30 N and points west.

Answer:

True

Explanation:

Answer:

a. Any one way then I can say that Aluminum sulfide has mass per mole of ≈150.2g while aluminum has mass per mole of 26.9g

b. Sulfur is an element but aluminum sulfide is a compound

c.Beryllium and chlorine

d. BeCl2

e.i. Metals form ions by losing electrons but nonmetals form ions by gaining electrons

ii.A metal can react with an acid to produce a salt a nonmetal doesnt

iii. A metal forms ionic compounds whilst nonmetals form covalent compounds

Answer:

a. Point A

b. 20 V

c. 100 J

Explanation:

a. Point A is at a higher potential because there is a positive sign in front of its magnitude. Since it is a positive integral value, and has a higher magnitude than point B which is at -4, point A is thus at a higher potential than point B.

b. The potential difference between the two points ΔV = A - B

= +16 V - (-4 V)

= +16 V + 4 V

= + 20 V

c. The work done, W in moving a charge Q across a potential difference ΔV is W = QΔV

So, since Q = 5 C and ΔV = + 20 V  

W = QΔV

= 5 C × (+ 20 V)

= 100 J

Explanation:

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Answer:

The change in kinetic energy is zero (0).

Explanation:

Given;

mass of the object, m = 3.0 kg

applied force, f = 6 N

distance through the object is moved, d = 4.0 m

The acceleration of the object is calculated as;

f = ma

a = f / m

a = (6) / 3

a = 2 m/s²

The constant speed through which this object is moved is calculated as;

v² = u² + 2ad

v² = 0 + 2 (2)(4)

v² = 16

v = √16

v = 4 m/s

The change in kinetic energy is calculated as;

ΔK.E = K.E(final) - K.E(initial)

ΔK.E = ¹/₂mv₂² -  ¹/₂mv₁²

v₂ = v₁ = v (since the mass was moved at a constant speed; v)

ΔK.E =  ¹/₂mv² -  ¹/₂mv²

ΔK.E = 0

Therefore, the change in kinetic energy is zero (0).