1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lelu [443]
3 years ago
7

HURRY PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Chemistry
2 answers:
aivan3 [116]3 years ago
8 0

Answer:


When <em>a scientist on Earth drops a hammer and a feather at the same time an astronaut on the moon drops a hammer and a feather, the result</em>  expected is that <em>the hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon (option D).</em>


Explanation:


In the abscence of atmosphere (vacuum), the objects fall in free fall. This is, the only force acting on the objects is the gravitational pull, which is directed vertlcally downward.


Under such absecence of air, the equations that rules the motion are:


  • V = Vo + gt
  • d = Vo + gt² / 2
  • Vf² = Vo² + 2gd

As you see, all those equations are independent of the mass and shape of the object. This explains why <em>when an astronaut on the moon drops a hammer and a feather at the same time</em>, <em>the hammer and feather hit at the same time on the moon</em>, a space body where the gravitational attraction is so small (approximately 1/6 of the gravitational acceleration on Earth) that does not retain atmosphere.


On the other hand, the air (atmosphere) present in Earth  will exert a considerable drag force on the feather (given its shape and small mass), slowing it down, whereas, the effect of the air on the hammer is almost neglectable. In general and as an approximation, the motion of the heavy bodies that fall near the surface is ruled by the free fall equations shown above, so, <em>the result </em>that is<em> expected  when a scientist on Earth drops a hammer and a feather at the same time is that the hammer hits the ground before the feather</em>.

Ludmilka [50]3 years ago
3 0

Answer

Correct Answer is D(D. The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.)

Explanation:

We know that, if an object drop from certain height with initial velocity u and it hits the ground with velocity v then time taken by the body to touch the ground will b given by following equation

t=\frac{(v-u)}{g}.........(1)

Here, g is gravitational acceleration

From equation(1), it is clear that time taken by the falling body to touch the ground does not depend on its mass but it only depends on initial velocity, final velocity and gravitational acceleration.

When a feather and hammer are dropped at the same time on earth  then hammer will touch the ground first because the feather is very light that, air pressure will act on it uniformly and it will counteract the acceleration due to gravity.

On moon there is no air so no pressure will be there on feather so both feather and hammer will hit at the same time on the moon.

You might be interested in
Identify the balanced chemical equation that represents a single displacement reaction. CF4 2Br2 ⟶ CBr4 2F2 3H2SO4 2Al ⟶ Al2(SO4
Simora [160]

Answer:

3H₂SO₄ + 2Al₂(SO₄)₃  → Al₂(SO₄)₃ + 3H₂

Explanation:

                           3H₂SO₄ + 2Al₂(SO₄)₃  → Al₂(SO₄)₃ + 3H₂

In this type of reaction, one substance is replacing another:

                      A + BC  →  AC + B

In a single displacement reaction, atoms replace one another based on the activity series. Elements that are higher in the activity series. Also, if the element that is to replace the other in a compound is more reactive the reaction will occur. If it is less reactive, there will be no reation.

In the first equation, fluorine is more reactive than bromine. Therefore, bromine cannot replace bromine.

In the second equation, the displacement is between hydrogen and aluminium. Hydrogen is lower in the activity series, this implies that aluminum will replace it.

5 0
3 years ago
Can someone help me with this​
Alexxx [7]

Answer:

uyfuj yfyuc

Explanation:

8 0
3 years ago
1s22s22p63s23p64s13d10 which element is this
Sholpan [36]

Answer:

Copper

Explanation:

5 0
3 years ago
Helppppp with this pleasee
vazorg [7]

Answer:

A. 1, 2, 5

Explanation:

Count the number of Ns in the formula.

- Hope that helped! Please let me know if you need a further explanation.

3 0
3 years ago
A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume chang
Mashutka [201]

Answer:

The density of the metal is 0.561 g/mL

Explanation:

The computation of the density of the metal is shown below;

As we know that

The Density of the metal is

= \frac{mass}{volume}

where,

Mass = 4.9g

Change in volume = 6.9 mL

Now place these values to the above formula

So, the density of the metal is

= \frac{4.9g}{6.9mL}

= 0.561 g/mL

Hence, the density of the metal is 0.561 g/mL

We simply applied the above formula so that the correct density could arrive

5 0
3 years ago
Other questions:
  • What is the approximate ratio of [NO2-] to [HNO2] in order to buffer a solution at pH=4.0?
    8·1 answer
  • Which of the following contains maximum number of atoms? a) 2.0g hydrogen b) 2.0g oxygen c) 2.0g nitrogen d) 2.0g methane
    14·1 answer
  • Which of the following is necessary to do a complete stoichiometric calculation? A) Add the nuclear masses of the products.
    9·1 answer
  • Scientists must be curious, honest, creative open minded skeptical , ethical and aware of bias. list 3 ways thinking like a scie
    12·1 answer
  • The reaction A → B + C is known to be zero order in A with a rate constant of 5.0 × 10–2 mol/L·s at 25°C. An experiment was run
    14·1 answer
  • If you quickly plunge a room-temperature mercury thermometer into very hot water, what will happen to the mercury level?\
    5·1 answer
  • 3. If 90.0 grams of barium chloride react with sulfuric acid, how many
    13·1 answer
  • Hey guys I need help with these questions on my test these are my questions I have not done it ***there are 4 pics I put***
    6·1 answer
  • Infectious agents vary in their size and shape. Which infectious agent tends to be the smallest?
    5·1 answer
  • If a material conducts heat easily, its a good _____. <br> It has to be a 18 letter word
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!