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
If 4520 kj of heat is needed to boil a sample of water, what is the mass of water
Cerrena [4.2K]

Answer:

1,085g of water

Explanation:

If we have the value 4520kj is because the question is related to Energy and heat capacity. In this case, the law and equation that we use is the following:

                                                  Q= m*C*Δt  where;

Q in the heat, in this case: 4520kj

m is the mas

Δt= is the difference between final-initial temperature (change of temperature), in this exercise we don´t have temperatura change.

In order to determine the mass, I will have the same equation but finding m

                                          m= Q/C*Δt    without   m=Q/C

So: m= 4,520J/4.18J/g°C

      m= 1,0813 g

5 0
3 years ago
A solution is made by dissolving
nikklg [1K]

Answer:

THE MOLARITY IS 2.22 MOL/DM3

Explanation:

The solution formed was as a result of dissolving 37.5 g of Na2S in 217 g of water

Relative molecular mass of Na2S = ( 23* 2 + 32) = 78 g/mol

Molarity in g/dm3 is the amount of the substance dissolved in 1000 g or 1 L of the solvent. So we have;

37.5 g of Na2S = 217 g of water

( 37.5 * 1000 / 217 ) g = 1000 g of water

So, 172.81 g/dm3 of the solution

So therefore, molarity in mol/dm3 = mol in g/dm3 / molar mass

Molarity = 172.81 g/dm3 / 78 g/mol

Molarity = 2.22 mol/dm3

The molarity of the solution is 2.22 mol/dm3

4 0
3 years ago
What would the solubility of the substance likely be if the water was heated to 150 degrees Celsius ?
Nimfa-mama [501]

idk google it watch me yt channel minecraft supergod pz

7 0
3 years ago
A physical change _____ change the composition or identity of the substance. will will not 2. An example of a physical change is
Sav [38]

Answer:

not sure

Explanation:

a physical change (can)change.,....

6 0
3 years ago
Name 5 metals used to make the penny over the years.
Irina18 [472]
These 5 metals are: zinc,copper,tin,bronze,nickel
6 0
3 years ago
Other questions:
  • A metabolic pathway that ___ (oxidizes or reduces) an energy-rich source to produce ATP from ADP. Electrons are transferred from
    5·2 answers
  • What mass of sulfur would have precisely 4.7x10^22 atoms of sulfur?
    9·2 answers
  • calculate the mass of calcium phosphate and the mass of sodium chloride that could be formed when a solution containing 12.00g o
    12·1 answer
  • Place the following compounds in order of increasing vapor pressure. methane, CH4; pentane, CH3CH2CH2CH2CH3; 1-propanol, CH3CH2C
    5·2 answers
  • When 10 grams of copper and 10 grams of iodine are mixed, what is the
    7·2 answers
  • Which has the largest atomic radius calcium bromide barium and astatine
    12·2 answers
  • ______ transport requires the use of energy.
    12·2 answers
  • Help and ill love you forever
    8·1 answer
  • The arrows show the changes of state.
    11·1 answer
  • How many different products can be formed from a poorly planned crossed aldol addition?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!