Can someone please help me with science

Answer:

PE =  98

Explanation:

PE =mgh

PE= 2 x 9.8 x 5

PE =  98

I hope this helps a little bit.

Answer:

1a)Mass is the amount of matter in the body.

1b)Weight is the measure of the amount of force acting on a mass due to acceleration and gravity.

2a)Mass can never be zero

2b)Weight can be zero if no gravity acts upon an object. like in space

3a) Mass does not change according to location.

3b)Weight varies according to location.

Answer: 36 Kg

Explanation:

Ke= 1/2MV^2

Plug in the kinectic energy (3042 J) and solve for M.

3042= 1/2 (M) (13^2)

M= 36 Kg

Answer:

This is an interesting and useful question.

With just a bit of algebra and a couple of equations, you can calculate the answer.

The MOST important equation is for Power, P=IV, current times voltage.

You have provided us with a value for the Power of each bulb (100W and 50W) and the voltage of 250V. These are easy numbers. Let's figure out the current through each bulb that produces each power rating.

Current through the 100W bulb = _______

Current through the 50W bulb = _______

(Do these numbers make sense? It would seem as though if the voltages are equal then more current would be needed to generate more power. Right?)

Now we have BOTH the current for each bulb AND the voltage for each bulb.

Time for another equation - the definition of resistance, R= V/I, voltage divided by current.

That should wrap things up for you.

(But, WAIT! Let’s actually MEASURE the resistance of each bulb. We’ve gotta find a resistance meter, also called an ohm-meter, to do this. Do NOT be disappointed if your measurements do not agree with your calculations. Life is WAAAAY too interesting to get hung up on details like this!)

The resistance ratio of the two bulbs is 1/2.

Electrical power of a circuit is defined as the time rate of change of work done in an electrical circuit.

Here,

Power in the first bulb, P₁ = 100 W

Power in the second bulb, P₂ = 50 W

Voltage applied to the bulbs, V = 250 V

The expression for electric power in a circuit is given as,

Power, P = V²/R

where R is the resistance of the circuit.

Since, the voltage is same for both the bulbs, we can say that,

P [tex]\alpha[/tex] 1/R  or  R [tex]\alpha[/tex] 1/P

Therefore, the ratio of resistances of the bulbs,

R₁/R₂ = P₂/P₁

R₁/R₂ = 50/100

R₁/R₂ = 1/2

Hence,

The resistance ratio of the two bulbs is 1/2.

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Student B is correct.

(3Ω + 6Ω + 17Ω )  =  26Ω

12v / 26Ω  =  0.46 Amperes

Answer:

d

Explanation:

lol Hope's this helps lovely

Answer:

B

Explanation:

The answer is b that is the final speed - initial speed divided by the time taken

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Answer:

If F is a constant, we can take f = 1

f = m×a

ma = 1

therefore we can say that force is hence proportinal to the product of mass and acceleration.

Answer:

v=s/t

s=vt

t=s/v

t=(120×10‐³)/172.8

(the distance meters has been changed to kilometres)

t=1/1440 hrs

Given ,

Answer:

This is your answer

Answer:

120 N

Explanation:

1 N = 1kg

120 N = 120kg

Hope this helps!

Answer:

[tex]\boxed {\boxed {\sf D. \ 6.02*10^{23} \ atoms}}[/tex]

Explanation:

One mole of a substance contains the same amount of representative particles. These particles can be atoms, molecules, ions, or formula units. In this case, the particles are atoms of titanium.

Regardless of the particles, there will always be 6.02*10²³ (also known as Avogadro's Number) particles in one mole of a substance.

Therefore, the best answer for 1 mole of titanium is D. 6.02*10²³ atoms.

Answer:

D) 6.02 x 1023

Explanation:

A.P.E.X

Answer:

296.01 J

Explanation:

From the question,

Q = cm(t₂-t₁)....................... Equation 1

Where Q = quantity of heat, c = specific heat capacity of aluminium, m = mass of aluminium, t₁ = Initial temperature, t₂ = Final temperature

Given: c = 897 J/kg.K, m = 0.01 kg, t₁ = 22 K, t₂ = 55 k

Substitute these values into equation 1

Q = 897×0.01×(55-22)

Q = 897×0.01×33

Q = 296.01 J

Hence 296.01 Joules of heat is required.

Answer:

a. 1100 meters.

b. Between B and C

c.1. Between point D and E

c2. Between point D and E

d. 3.7 m/s.

Explanation:

The girl travels the distance of 1100 meters from starting to the end. There is no motion occurs between B and C due to no change of distance value from 200 meters. Between point D and E, the girls covers 500 meters long distance and also covers fastest distance between point D and E because between point D and E, the girl covers 500 meters distance in 30 seconds which is the highest of all. The average speed of the girls is 3.7 meter/seconds if we divide total distance i.e. 1100 meters by time which is 300 seconds.

Answer:

Part A

The distance travel by the rock is approximately 132.496 m

Part B

The speed when the rock hits the ground is approximately 50.96 m/s

Explanation:

Part A

The question is focused on the kinetics equation of a free falling object

The given parameter is the time it takes the rock to hit the ground, t = 5.2 s

For an object in free fall, we have;

h = 1/2·g·t²

Where;

h = The height from which the object is dropped

g = The acceleration due to gravity ≈ 9.8 m/s²

t = The time taken to travel the distance, h = 5.2 s

∴ h = 1/2 × 9.8 m/s² × (5.2 s)² ≈ 132.496 m

The distance travel by the rock, h ≈ 132.496 m

Part B

The speed, 'v', when the rock hits the ground, is given by the following kinematic equation,

v = g·t

∴ v = 9.8 m/s² × 5.2 s = 50.96 m/s

The speed when the rock hits the ground, v ≈ 50.96 m/s.

Answer:

The tissues in a multicellular organism requires a circulatory system in other to deliver oxygen and food to the tissues while also removing carbon dioxide and metabolic wastes due the complexity of these activities

Explanation:

Multicellular organisms are organisms that are made of more than one cell. the more cells an organism has the more complex certain activities might be for the organism hence the tissues in a multicellular organism requires a circulatory system in other to deliver oxygen and food to the tissues while also removing carbon dioxide and metabolic wastes

Answer:

I think ur answer would be true

Explanation:

hope this helps

Answer:

I hope this helps a little bit.

The time required for Mars to orbit the Sun in Earth days is 1.87y.

The square of the time period of orbiting is directly proportional to the cube of the mean distance.

The ratio of mean distance, (am /ae)³ = (Tm/Te)²

Substitute the ratio of semimajor axis and time period of earth orbit Te =1 yr, we get

(1.52)³ = (Tm / 1 yr)

Tm=1.87y.

Thus, the time required for Mars to orbit the Sun in Earth days is 1.87y.

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Answer:

the rocks have the same amount of thermal energy

Answer:

During an excursion or a reversal, the magnetic field is considerably weakened and allows many more cosmic rays to reach the surface of the planet. These energetic particles from space can be damaging to life on Earth if too many reach the surface.

Explanation:

Radio waves may generate astronomical bodies with fluctuating magnetic fields. A further explanation is below.

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You can download answer here

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Answer:

A=0.80

Explanation:

a=2×100/time^2. a=2×100/15.86^2. = a=0.80

The acceleration of the system will be 0.833 meters per second square.

The behavior of things is predicted by Newton's first rule of motion when all external forces are equal. The first law, sometimes known as the law of inertia, asserts that if an entity's energies are balanced, its acceleration will be zero meters per second.

When all forces are balanced, an object is said to be in equilibrium and won't accelerate. Newton postulated that an item will only accelerate in the presence of a net or uneven force. An object will accelerate if there is an imbalanced force present, altering its direction, speed, or both.

Let 'm' be the mass of the object in kilogram and 'a' is the acceleration of the object in meters per second square. Then the force on the system is calculated as,

F = ma

For a system mass of 600g and a hanging weight of 0.50 N. Convert the mass of the object into kilogram. Then we have

m = 600 / 1000

m = 0.6 kg

Then the acceleration of the system will be calculated as,

0.50 = 0.6 × a

a = 0.833 meters per second square

The acceleration of the system will be 0.833 meters per second square.

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Answer:

Dynamos and Generators convert mechanical rotation into electric power.

Dynamo - a device that makes direct current electric power using electromagnetism

Generator - used to describe an alternator that creates AC power using electromagnetism.

Explanation: so dynamo makes direct electric power using electromagnetism. A generator creates AC power using electromagnetism

Answer: mixture

Explanation: mixture contains two or more substances which are not chemically bonded together

Answer:

B. Mixture

Explanation:

Answer:

See Explanation

Explanation:

The question is incomplete, as there are no diagrams or options to provide more information to the question.

The general explanation is as follows:

For the object not to move

(1): The forces acting on the object must opposite each other. i.e. if force A acts at the right (or positive direction), force B will act at the left (or negative direction).

(2) The two forces must be equal.

So, for instance:

If the pair of forces are 5N and 5N in opposite directions, the object wil not move.

However, if one of the forces is greater, the object will move towards the direction of the greater force.

Answer:

The time it takes for the change in the angular velocity to occur is 6.5 seconds

Explanation:

From the question, we have;

The angular acceleration of the wheel, α = -4.20 rad/s²

The final angular velocity of the wheel, ω = -26.0 rad/s

From the information, we have the initial direction of rotation of the wheel = Counterclockwise

The angular displacement while the change occurs = 0 rad/s

Therefore, the initial angular velocity of the wheel, ω₀ = 0 rad/s

We have;

[tex]\alpha = \dfrac{\omega -\omega _0 }{t - t_0}[/tex]

Where;

t - t₀ = The time it takes for the change to occur

[tex]\alpha = \dfrac{\omega -0 }{t - 0}[/tex]

When t₀ = 0, we have;

t - t₀ = t

[tex]\alpha = \dfrac{\omega }{t}[/tex]

[tex]\therefore t = \dfrac{\omega}{\alpha }[/tex]

[tex]\therefore t = \dfrac{-26 \, rad/s}{-4 \, rad/s^2 } \approx 6.5 \, seconds[/tex]

The time it takes for the change in the angular velocity to occur is t - t₀ = 6.5 seconds

Answer

It will stay the same!

Explanation:

If you so happen to move something from left to right, the size of it is not being shrunk or expanded in any type of way, shape, or form.

Answer:

B- They both have travelled equal distances in 7 minutes

Hope this helps!

Answer:

B!

Explanation: