help with this please idk it

Answer:

35.7m

Explanation:

Given parameters:

Mass of rock  = 25kg

Time of fall  = 2.7s

Unknown:

Height of the building = ?

Solution:

To solve this problem, we will use one of the motion equations;

     S  = ut + [tex]\frac{1}{2}[/tex] gt²

S is the height

u is the initial velocity  = 0m/s

t is the time

g is the acceleration due to gravity

      S = (0 x 2.7) +  [tex]\frac{1}{2}[/tex] x 9.8 x 2.7²  = 35.7m

Answer:

* viajan a través del aire, liquido o solido

*Moverse en la misma dirección que el flujo de energía

Explanation:

En el análisis de ondas existen dos tipo fundamentales: Transversales y longitudinales.

La ondas transversales las oscilación de la partícula es perpendicular al movimiento de la misma.

En la onda longitudinal el movimiento de la partícula es en la misma dirección que el movimiento de la onda, por esta razón están ondas se llaman ondas de compresión.

En base a las definiciones iniciales las frases correctas son:

* viajan a través del aire, liquido o solido

*Moverse en la misma dirección que el flujo de energía

Answer:

Cause molecules to vibrate

Travel through air, liquid, or solid

Move in the same direction as energy flow

Explanation:

Answer:

i think it's a or c hope it helps :)

Explanation:

u don't have to give brainliest tho it's fine save ur points :)

Answer: 1.8 x 10-4 W/m^2

Explanation:

Hardness, color , and luster.

But since you can pick one, I would say hardness

Explanation:

For most temperature scales, the boiling point of water and the freezing point is used to calibrate it.

Three known temperature scales;

                               Kelvin scale              Celcius scale          Fahrenheit scale

Freezing point             273K                            0°C                        32°F

Melting point                373K                          100°C                     212°F

Answer:

Explanation:

im sorry i coudnty help

The rocket attains a speed of 60 m/s in a matter of 6.3 s, so it is undergoing an acceleration a of

a = (60 m/s - 0) / (6.3 s) ≈ 9.52 m/s²

During launch, the only forces acting on the rocket are directed vertically:

• its weight (pointing down) with magnitude W,

• drag (pointing down) with magnitude 50 N, and

• thrust (pointing up) with magnitude T.

(a) By Newton's second law, the magnitude of the net force is proportional to the acceleration according to

∑ F = m a

where m is the mass of the rocket, so the magnitude of the net force is

(8 kg) (9.52 m/s²) ≈ 76.2 N

and it is directed upward.

(b) Expanding the equation from part (a) gives

T - W - 50 N = (8 kg) (9.52 m/s²)

The weight is

W = (8 kg) g = (8 kg) (9.80 m/s²) = 78.4 N

so the thrust force is

T ≈ 76.2 N + 78.4 N + 50 N ≈ 205 N

(c) We found this earlier, a ≈ 9.52 m/s².

(d) The rocket's height y at time t is given by

y = 1/2 a t ²

so that after 6.3 s, it will have reached a height of

y = 1/2 (9.52 m/s²) (6.3 s)² = 189 m

Answer:

power=300watt

Explanation:

Answer: The force of gravity

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 75 × 3

We have the final answer as

Hope this helps you

Answer:

No, we should not pay attention to these opinions. (Find the essay below)

Explanation:

Celebrities are people who are prominent or well known because of the work that they do. Actors and sports stars are rightly classified as celebrities because their work affords them a lot of exposure. We see them on television, the internet and social media, and hear about their deeds and accomplishments on the radio.

This group of people always have their opinions about life and other topics of interest which they air when interviewed or when they decide to volunteer the information on their own accord. Most times fans who love them value their opinion so much that they even adjust to them or view it as the standard. For these fans, celebrities are their role models. They tend to copy their hairstyles, modes of dressing, and their opinions! Advertisers key to this fact when they use them to promote their goods.

It is very wrong to hold the opinions and actions of celebrities as the gold standard because they are imperfect and are prone to mistakes. Celebrities are just like any other one of us who have opinions or behave in ways that are sometimes wrong. Copying their every move, action, and opinions would be potentially damaging to us. Their opinions should be taken with a pinch of salt.

It is important that while fans maintain the love they have for their favorite celebrities, they also endeavor to have a mind of their own. Each person should know what works for him or her and live by such. It would be a great mistake to be easily carried away by the opinions of others.

Conclusively, balance is key. Love for celebrities should never cloud an individual's thinking. When this is done, future heartaches that come from adhering to wrong opinions can be avoided.

We should not pay attention to the opinions and actions that are portrayed by the media about celebrities.

Read related link on:

https://brainly.com/question/19262252

Answer:

4km

Explanation:

Distance=speed x time

Knowing this we know the time and speed

so it is 8 x .5= D

And 8 x .5 =4

If you have any questions let me know

Answer:

b

Explanation:

a=v2/r

=0.89^2/2.8

=0.2828...

=0.28

The centripetal acceleration of the child sitting on a merry-go-round 2.8 m from the center will be 0.283 m/s².

Centripetal acceleration is the constant change in velocity necessary for an object to maintain a circular path. We can write the formula for centripetal acceleration as -

a[C] = v[T]²/r

where -

v[T] is tangential velocity

r is radius

Given is a child is sitting on a merry-go-round 2.8 m from the center and the tangential velocity of the ride is 0.89 m/s.

We can write -

Radius [r] = 2.8 m

Tangential velocity = v[T] = 0.89 m/s.

Using the formula for centripetal acceleration -

a[C] = v[T]²/r

a[C] = (0.89 x 0.89)/2.8

a[C] = 0.283 m/s²

Therefore, the centripetal acceleration of the child sitting on a merry-go-round 2.8 m from the center will be 0.283 m/s².

To solve more questions on Circular motion, visit the link below-

https://brainly.com/question/17123770

#SPJ2

Answer:

23

Explanation:

Answer:

C

Explanation:

I did this on edge an that was the answer

Answer:

.

Explanation:

Answer:

the pelvice

Explanation:

Answer:

I would think the first and the third answer

Answer:

i would say 3rd cause other may slightly effect

Answer:

[tex]g'=10.78\ m/s^2[/tex]

Explanation:

The time period of a simple pendulum is given by :

[tex]T=2\pi \sqrt{\dfrac{L}{g}}[/tex]

L is length of the pendulum and g is acceleration due to gravity

At the bottom of Death valley, g = 9.8 m/s²

We need to find the value of g if the period of the pendulum is decreased by 5.00%.

T'=(T-0.05T)= 0.95 T

[tex]T\propto \dfrac{1}{\sqrt{g} }\\\\\dfrac{T}{T'}=\sqrt{\dfrac{g'}{g}}\\\\\dfrac{T}{0.95T}=\sqrt{\dfrac{g'}{9.8}}\\\\\dfrac{1}{0.95}=\sqrt{\dfrac{g'}{9.8}}\\\\1.1=\dfrac{g'}{9.8}\\\\g'=10.78\ m/s^2[/tex]

So, the new value of acceleration due to gravity is [tex]10.78\ m/s^2[/tex].

Answer:

  39.2 m/s

Explanation:

Given:

  free-fall from rest for 4 seconds

Unknown:

  final velocity (v)

Solution:

  equation: v = at

The acceleration due to gravity is 9.8 m/s², so the velocity after 4 seconds will be ...

  v = (9.8 m/s²)(4 s) = 39.2 m/s

At the bottom of the cliff, the velocity of the ball will be 39.2 m/s.

Answer:

A car

Explanation:

A car can travel 100 m in 5 seconds

Hope this helps!

Answer:

Bananas go through a process called ‘negative geotropism’ so they can reach the sun

Answer:

bouyant force - the upward force on an object in a fluid

boiling point - the temperature at which a liquid becomes a gas

solubility - the ability of a substance to dissolve in another

conductivity- the ability to transfer heat or electricity

density - the amount of mass in a given volume

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 45 × 15

We have the final answer as

Hope this helps you

Answer:

a and b

water has a higher surface tension than veg oil

isopropyl alcohol boils more esier than water

Explanation:

just did the test trust me :)

A and B statement is true about the substances in this experiment.

A. Water has a higher surface tension than vegetable oil.

B. Isopropyl alcohol boils more easily than water.

A substance is a specific type of stuff with specific features. A substance is any pure compound or element. Water is a pure material and a hydrogen-oxygen combination.

A. Water has a higher surface tension than vegetable oil.

Reason:

The force operating at a border between two phases is measured as surface tension. Surface tension at liquid-air interfaces is caused by the higher attraction of liquid molecules to each other than air molecules.

Due to the relatively strong attraction of water. Hence molecules of water have high surface tension.

B.. Isopropyl alcohol boils more easily than water.

Reason:

isopropyl alcohol is a highly flammable liquid that evaporates significantly faster than water, especially when heated. The boiling point of isopropyl alcohol is lower than that of water.

Alcohol is more volatile than water. Hence Isopropyl alcohol boils more easily than water.

To learn more about the substance refer to the link;

https://brainly.com/question/24372098

Answer:

the total kinetic and potential energy of its particles

Explanation:

The energy contained in the small motions of the object's molecules can be broken up into a combination of microscopic kinetic energy and potential energy.

Answer:

ω = 0.1 rad/s

v = 0.002 m/s

Explanation:

The angular velcoity of the second hand of the clock can be found by:

ω = θ/t

where,

ω = Angular Speed

θ = Angular Displacement

t = time taken

Now, for one complete revolution of second hand of the clock:

θ = 2π rad

t = 60 s

Therefore,

ω = 2π rad/60 s

ω = 0.1 rad/s

Now, for the linear speed (V):

V = rω

where,

V = Linear Speed of Second Hand = ?

r = radius = length of second hand = 0.02 m

Therefore,

V = (0.02 m)(0.1 rad/s)

V = 0.002 m/s

gravitaional pull

not sure

Answer:It depends on the initial velocity of the projectile and the angle of projection. The maximum height of the projectile is when the projectile reaches zero vertical velocity. ... The horizontal displacement of the projectile is called the range of the projectile and depends on the initial velocity of the object