answer.
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
VashaNatasha [74]
2 years ago
13

Linda threw two stones, one in a horizontal direction and another one straight up. She observed that both stones fell back to th

e ground. Based on her observations, the BEST explanation would be that gravity is a force that
A) pushes up towards the sky.
B) pulls down towards the earth.
C) pushes objects in two directions.
D) acts in the direction any objects moves.
Chemistry
2 answers:
Anna71 [15]2 years ago
4 0
It's 'B) pulls down towards the earth.'
bonufazy [111]2 years ago
3 0

Answer:

It is B !!!

Explanation:

When I throw any object any direction it always falls down to earth do to the gravitational pull on the earth.

Hopes this helps.

Your welcome,

                        Shadow Lolbit

You might be interested in
What is the element with the nlx notation of 5d2?
lesantik [10]
The element with the nlx notation of 5d2 in the periodic table is hafnium with a symbol of hf. It is a chemical element and has an atomic number 72. H<span>afnium chemically resembles zirconium and is found in many zirconium minerals but it is a complete contrast of zirconium which is also chemically similar to hafnium.</span>
7 0
2 years ago
Find the age t of a sample, if the total mass of carbon in the sample is mc, the activity of the sample is a, the current ratio
Paha777 [63]
N₀ is the number of C-14 atoms per kg of carbon in the original sample at time = Os when its carbon was of the same kind as that present in the atmosphere today. After time ts, due to radioactive decay, the number of C-14 atoms per kg of carbon is the same sample which has decreased to N. λ is the radioactive decay constant.
Therefore N = N₀e-λt which is the radioactive decay equation,
N₀/N = eλt In (N₀.N= λt. This is the equation 1
The mass of carbon which is present in the sample os mc kg. So the sample has a radioactivity of A/mc decay is/kg. r is the mass of C-14 in original sample at t= 0 per total mass of carbon in a sample which is equal to [(total number of C-14 atoms in the sample at t m=m 0) × ma]/ total mass of carbon in the sample.
Now that the total number of C-14 atoms in the sample at t= 0/ total mass of carbon in sample = N₀ then r = N₀×ma
So N₀ = r/ma. this equation 2.
 The activity of the radioactive substance is directly proportional to the number of atoms present at the time.
Activity = A number of decays/ sec = dN/dt = λ(number of atoms of C-14 present at time t) = 
λ₁(N×mc). By rearranging we get N = A/(λmc) this is equation 3.
By plugging in equation 2 and 3 and solve t to get
t = 1/λ In (rλmc/m₀A).

6 0
2 years ago
Based on the values you obtained for δh∘rxn, which of the reactions would you expect to be thermodynamically favorable and which
QveST [7]
Following reactions are involved in present reaction
1) A<span>g+(aq)   +    Li(s)     →       Ag(s)     +       Li+(aq)      </span><span>−      384.4kJ
2) </span><span>2Fe(s)     +     2Na+(aq)      →        Fe2+(aq)      +       2Na(s)     +   392.3kJ
</span>3)  <span>2K(s)     +      2H2O(l)      →      2KOH(aq)       +H2(g)       −393.1kJ

In above reaction, reaction 1 and 3 has negative value of </span>δh∘f, while reaction 2 has posiyive value of <span>δh∘f. As per the sign convention positive sign indicates that heat is given out during the reaction, while negative sign indicates heat is to be supplied for reaction to occur. In alternative words, product formed in reaction 2 is stable as compared to reactant. Hence, it is thermodynamically favorable. </span>
7 0
2 years ago
Identify one disadvantage to each of the following models of electron configuration:
Murrr4er [49]

Answer:

The disadvantages of each of the given model of electron configuration have been mentioned below:

1). Dot Structures - They take up excess space as they do not display the electron distribution in orbitals.

2). Arrow and line diagrams make the counting of electrons and take up too much space.

3). Written Configurations do not display the electron distribution in orbitals and help in lose counting of electrons easily.

6 0
2 years ago
Read 2 more answers
Strontium nitrate, Sr(NO3)2, is used in fireworks to produce brilliant red colors, Suppose we need to prepare 366.6 ml. of 0.115
natulia [17]

Answer:

\boxed{\text{8.91 g}}

Explanation:

1. Calculate the moles of Sr(NO₃)₂

n = \text{366 mL} \times \dfrac{\text{0.115 mmol}}{\text{1 mL}}= \text{42.09 mmol}

2. Calculate the mass of SrNO₃)₂

m = \text{42.09 mmol} \times \dfrac{\text{211.63 mg}}{\text{1 mol}}= \text{8910 mg} = \text{8.91 g}\\\text{The mass of strontium nitrate required is }\boxed{\textbf{8.91 g}}

3 0
2 years ago
Other questions:
  • How many moles of O2 should be supplied to burn 1 mol of C3H8 (propane) molecules in a camping stove
    11·1 answer
  • Students working in lab accidentally spilled 17 l of 3.0 m h2so4 solution. they find a large container of acid neutralizer that
    14·1 answer
  • Match each decimal number to the correct scientific notation. 30,700 0.000307 0.00000307 3,070,000 3.07 × 10-6 arrowRight 3.07 ×
    12·2 answers
  • Write a half-reaction for the oxidation of the manganese in MnCO3(s) to MnO2(s) in neutral groundwater where the carbonate-conta
    6·1 answer
  • A mixture of gases containing 0.20 mol of SO2 and 0.20 mol of O2 in a 4.0 L flask reacts to form SO3. If the temperature is 25ºC
    11·1 answer
  • <img src="https://tex.z-dn.net/?f=PCl_5%20%5Crightleftarrows%20PCl_3%20%2B%20Cl_2" id="TexFormula1" title="PCl_5 \rightleftarrow
    13·1 answer
  • Hydrogen peroxide, H2O2, is common in many households and is used as a bleaching agent. It usually comes in a dark, opaque bottl
    5·1 answer
  • Imagine you are volunteering in a 1st grade classroom. The students recently learned about the water cycle. One student raises h
    10·1 answer
  • Put the following elements into five pairs of elements that have similar chemical reactivity: F, Sr, P, Ca, O, Br, Rb, Sb, Li, S
    6·1 answer
  • What is the buoyant force of a dog that displaces 10 pounds of water?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!