i reallllly need someone to answer this quick. it's fine if you can't though

Answer:

A. 0.5m/s².

B. –0.5m/s².

C. –0.5m/s².

D. 100m.

Explanation:

A. Determination of the acceleration in the first 20s.

Initial velocity (u) = 0

Final Velocity (v) = 10m/s

Time (t) = 20secs.

Acceleration (a) =..?

Acceleration = change in Velocity /time

a = (v – u)/t

a = (10 – 0)/20 = 10/20

a = 0.5m/s²

Therefore, the acceleration of the cyclist in the first 20secs is 0.5m/s²

B. Determination of the acceleration between 20 and 30s. This can be obtained as follow:

Initial velocity (u) = 10m/s

Final Velocity (v) = 5m/s

Time (t) = 30 – 20 = 10s

Acceleration (a) =..?

Acceleration = change in Velocity /time

a = (v – u)/t

a = (5 – 10)/10 = –5/10

a = –0.5m/s²

Therefore, the acceleration of the cyclist between the 20 and 30secs is

–0.5m/s².

C. Determination of the acceleration in the last 10s.

Initial velocity (u) = 5m/s

Final Velocity (v) = 0

Time (t) = 10s

Acceleration (a) =..?

Acceleration = change in Velocity /time

a = (v – u)/t

a = (0 – 5)/10 = –5/10

a = –0.5m/s²

Therefore, the acceleration of the cyclist between the last 10secs is

–0.5m/s².

D. Determination of the distance travelled by the cyclist when he was moving at a constant speed.

Velocity (v) = 5m/s

Time (t) = 50 – 30 = 20secs

Displacement (d) =?

Velocity = Displacement /Time

v = d/t

5 = d/20

Cross multiply

d = 5 x 20

d = 100m

Therefore, the distance travelled by the cyclist at constant speed is 100m

Answer:

the materials most often used to construct load bearing walls in large building are concrete ,block or brick . load bearing walls are one of the earliest forms of construction

Answer:

Hey!

Well according to scientific data and analysis, it started to break up about 175 - 200 million years ago!!

Explanation:

HOPE THIS HELPS!!

Answer:

250 million (:

Explanation:

The boat has to pull with MORE force. Don't forget about the force of friction with the water, pulling the skier in the backwards direction. The force that accelerates him is the NET force ... boat force minus water resistance. So the boat force has to be greater than the net accelerating force.

Explanation:

Rectifier diodes are used in power supplies to convert alternating current (AC) to direct current (DC), a process called rectification. They are also used elsewhere in circuits where a large current must pass through the diode.

Answer:

When objects fall to the ground, gravity causes them to accelerate.

Answer:  [tex]\bold{\text{Slope (m)}=\dfrac{1}{4}}[/tex]

Explanation:

A linear equation is of the form: y = mx + b   where

x + 4y = 16

     4y = -x + 16

       [tex]y = -\dfrac{1}{4}x+\dfrac{16}{4}[/tex]

       [tex]y=-\dfrac{1}{4}x+4[/tex]

The y-intercept (b) = 4

Next, find the slope given point (4, 5) and b = 4

[tex]y=mx+b\\\\5=m(4)+4\\\\1=4m\\\\\dfrac{1}{4}=m\\\\\\\\\large\boxed{Slope (m)=\dfrac{1}{4}}[/tex]

Answer:

Image result for If the world was not tilted, what would happen to the people living on Earth

If the Earth weren't tilted on its axis, there would be no seasons. And humanity would suffer. When a Mars-size object collided with Earth 4.5 billion years ago, it knocked off a chunk that would become the moon. It also tilted Earth sideways a bit, so that our planet now orbits the sun on a slant

Explanation: i looked up the answer

Answer:

we would all maybe fall are sink in to the ground.

Explanation:

It is basically a very tiny region centering around protons and neutrons in the center of a atom

Answer:

b.

Explanation:

-vesign shows the lens is CONCAVE

f=1/power

Answer:

9/10

Explanation:

From Archimedes' principle, the buoyant force on the ice equals the weight of water displaced. Since the buoyant force equals the weight of the ice. then

ρ₁V₁g = ρ₂V₂g where ρ₁ = density of ice = 0.9 g/cm³ and V₁ = volume of ice and ρ₂ = density of water = 1 g/cm³ and V₂ = volume of water.

So. ρ₁V₁ = ρ₂V₂

V₁ = ρ₂V₂/ρ₁

=  1 g/cm³V₂/0.9 g/cm³ = 10V₂/9

Now, let x be the fraction of volume of ice submerged. So V = xV₁ = volume submerged. This volume also equals the volume of water since the submerged ice displaces its own volume of water.

So V = V₂

xV₁ = V₂

x(10V₂/9) = V₂

10x/9 = 1

x = 9/10

Answer:

To see a shadow there most be light provided, even if it's night and there are lights, we can still see the shadow but if there is no light, we can't.

Hope it helped (:

Answer: yes of course, but there should be some light to make or see shadows.

Answer:

A

Explanation:

Just recall the formula for the gain in kinetic energy and substitute the values in.

Answer:

The velocity of the ball is 5 m/s to the left.

Explanation:

-25kg*m/s divided by 5 kg gives

speed of -5 m/s

The velocity of the ball is 5 m/s to the left.

Answer:

K is the spring/elastic constant measured in Newton per metre square (N/m²)

Explanation:

E = ½Ke²

In the equation above,

E is the energy in Joules (J)

K is the elastic/spring constant in Newton per metre square (N/m²)

e is the extension in metre (m)

Answer:

In the equation Ee = ½ × k × e², "k" = spring constant

Explanation:

Answer:

Acceleration (a) = 40 m/s²

Explanation:

Given:

Initial velocity (u) = 6 m/s

Final velocity (v) = 4.4 m/s

Time taken (t) = 0.04sec

Find:

Acceleration (a) = ?

Computation:

We know that,

⇒ v = u + at

⇒ a = (v - u) / t

⇒ Acceleration (a) = (4.4 - 6) / 0.04

⇒ Acceleration (a) = (-1.6) / 0.04

Acceleration (a) = 40 m/s²

Answer: - 452.088joule

Explanation:

Given the following :

Mass of water = 12g

Change in temperature(Dt) = (11 - 20)°C = - 9°C

Specific heats capacity of water(c) = 4.186j/g°C

Q = mcDt

Where Q = quantity of heat

Q = 12g × 4.186j/g°C × - 9°C

Q = - 452.088joule

Answer:

8.31 m3-Pa/mol-K

Explanation:

Answer:

the pressure due to the water on the diver is 200,000 pascal

pressure = height × density × acceleration due to gravity

p = 20×1000×10

p=200,000 pascal

Answer:

visual art in which one uses to mark drawing and express feelings

Explanation:

In my own opinion. Hope it helps.

Answer:

t = 5.19 s

Explanation:

We have,

Height of the cliff is 132 m

It is required to find the time taken by the ball to fall to the ground. Let t is the time taken. So, using equation of kinematics as :

[tex]y=ut+\dfrac{1}{2}gt^2\\\\\text{since}\ u=0\\\\y=\dfrac{1}{2}gt^2\\\\t=\sqrt{\dfrac{2y}{g}}\\\\t=\sqrt{\dfrac{2\times 132}{9.8}}\\\\t=5.19\ s[/tex]

So, it will take 5.19 seconds to fall to the ground.

Answer:

both a and b have same pressure

Answer:

There is no answer, since a closed-pipe resonator can NOT have a second harmonic. However, if you were to plug the pipe length and the speed of sound into the closed-pipe equation anyway you would get 49.56 as your fundamental frequency, which means that 99.13 would be your "plug and play" 2nd harmonic.

Explanation:

Answer:

1237.5N

Explanation:

Recall that F = ma ........1

Where F is the applied force in Newton

M is the mass in kg

And a is the acceleration in meter per seconds.

F = ?

Mass = 275kg

a = 4.50 m/s^2

Substituting the values into equation 1

F = 275kg × 4.50 m/s^2

F = 1237.5N

The force exerted on them will be 1237.5N

Answer:

nuclear fusion plants are fossil fuels, if you are asking which of the following is a fossil fuel

Explanation:

Answer:

mercury

Explanation:

The planet with the smallest mass must have the smallest gravitational pull - which is mercury, with a pull of approx. 0.38 times the Earth's gravitational pull.

1) The length of the wire needs to be measured and varied (this is order to get a complete set of results for your experiment )2) Then go through each length of wire and measure the current and potential difference for each wire. (in order to calculate resistance later )3) repeat multiple times for each length of wire in order to create an average = sum/n (if need be explain difference between accuracy and precision).4)calculate resistance using equation resistance * current = Voltage for each length of wire

Hazards: Electric shock due to current , overheating wire can overheat , can be minimised by using low currents.

As the length of the nichrome wire will increase then the resistance in the wire will also increase and if the length of the nichrome wire will decrease then the resistance in the wire will also decrease because the resistance is directly proportional to the length of the wire.

A force that opposes the flow of current is electrical resistance, often known as resistance to electricity. It acts as a gauge for how challenging it is for current to flow in this fashion. Ohms (Ω), which represent resistance values, are used.

Electricity will move from high to low when an electron difference exists between two terminals. This flow is opposed by resistance. Lower currents occur at higher resistance levels. The opposite is also true: the current increases as the resistance decreases.

As the length of the wire increase then the resistance increases automatically similarly if the length is reduced the resistance will also get reduced because length is directly proportional to the resistance in the wire. One more thing is that if the resistance in the wire increase then the heating in the wire will also increase and vice versa because resistance in the wire is directly proportional to the heating effect in the wire.

To get more information about Resistance :

https://brainly.com/question/11431009

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