Answer:
rahul's weight
Explanation:
internet
The force is equal to the force Rahul exerts on Earth is Rahul's weight.
What is Force?Force is that thing which cause a change in the motion of an object
What is force Rahul?Since Rahul sits on the chair, his weight exerts a downwards force towards the Earth which is the attraction of the Earth on Rahul. Now, Rahul also exerts a force of attraction on the Earth which is also equal to his weight, since according to Newton's third law which states that for every action, there is an equal and opposite reaction.So, Rahul exerts a force on the Earth equal to his weight.
Thus, the force is equal to the force Rahul exerts on Earth is Rahul's weight.
Learn more about force here:
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Helppppppppp pweaseeeee
Answer:
Explanation:
b
How are radar and an approaching siren different? How are they similar?
A. Radar uses sound waves, and the siren uses radio, but both exhibit
the Doppler effect
B. Radar uses radio, and the siren uses sound waves, but both exhibit
the Doppler effect
C. The Doppler effect can be observed only with radar, but both
devices use sound waves.
D. The Doppler effect can be observed only in the approaching siren,
but both devices use radio.
Answer:
b
Explanation:
Radar uses radio, and the siren uses sound waves, but both exhibit the Doppler effect. Therefore, option (C) is correct.
What is Doppler's effect?Radar operates by emitting radio waves and measuring the reflected waves to detect objects and determine their velocity. On the other hand, an approaching siren emits sound waves that propagate through the air.
Both radar and an approaching siren exhibit the Doppler effect. The Doppler effect is the change in frequency or pitch of waves (sound or electromagnetic) when the source of the waves and the observer are in relative motion. In the case of radar, the Doppler effect is used to measure the velocity of objects based on the frequency shift of the reflected radio waves. Similarly, the Doppler effect is observed with an approaching siren as the sound waves compress and the frequency appears higher as the source approaches the listener.
Therefore, both radar and an approaching siren differ in the type of waves they use (radio waves vs. sound waves), but they share the characteristic of exhibiting the Doppler effect.
Learn more about Doppler effect. here:
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#SPJ5
50.0 grams of water vapor at STP occupies how much volume?
A 62.2 L
B 69.0 L
C 47.2 L
D 22.4 L
Answer:
22.4 L
hope it will help you
Consider the following reaction:
2CuCl2 + 4KI → 2CuI + 4KCl + I2
When 0.64 grams of CuCl2 reacts with 0.78 grams of KI, how many grams of I2 are formed?
What is the limiting reactant?
What is the excess reactant?
PLEASE I NEED HELP
A 125.0-g sample of a metal heated to 100.0 ∘C and placed in a calorimeter that contains 250.0 g of water. The temperature rises from 24.3 ∘C to 27.2 ∘C. What is the specific heat capacity of the metal? Ignore the calorimeter in your analysis. Group of answer choices
Answer:
0.333J/g°C is the specific heat of the metal
Explanation:
The heat that the metaal gives is equal to the heat that water is absorbing. The equation is:
S(metal)*ΔT(metal)*Mass(metal) = S(H2O)*ΔT(H2O)*Mass(H2O)
Where S is specific heat, ΔT is change in temperature and mass the mass in grams of the metal and water.
Replacing:
S(metal)*(100.0°C-27.2°C)*125.0g = 4.184J/g°C*(27.2°C-24.3°C)*250.0g
S(metal) = 4.184J/g°C*(27.2°C-24.3°C)*250.0g / (100.0°C-27.2°C)*125.0g
S(metal) = 0.333J/g°C is the specific heat of the metal
The concentrations of hydrogen ion in two solutions are (a).1×10-4moldm and (b).5×10-9moldm. What is the pH of each solutions?
Answer:
(a) pH=4.0
(b) pH=8.3
Explanation:
Hello there!
In this case, since the pH is understood as the potential of the hydrogen in an aqueous solution, and we can calculate it is as follows:
[tex]pH=-log([H^+])[/tex]
We simply need to plug in the concentrations on each question as shown below:
(a)
[tex]pH=-log(1x10^{-4})\\\\pH=4[/tex]
(b)
[tex]pH=-log(5x10^{-9})\\\\pH=8.3[/tex]
Regards!
What percent of the water reactant is oxygen?
Answer:
Both hydrogen and oxygen gases exist as diatomic (“two-atom”) molecules. These molecules are the reactants in the reaction
Explanation:
:)
What is the center of the atom called?
Group of answer choices
Electron
Neutron
Nucleus
Proton
Answer:
nucleus
Explanation:
thats 100% the answer
What is the value for AG at 300 K if AH = 27 kJ/mol and AS = 0.09 kJ/(mol-K)?
O
A. AG = 54 kJ/mol
O
B. AG=-18 kJ/mol
O
C. AG= 0 kJ/mol
O
D. AG = 27 kJ/mol
Answer:
0 kJ/mol
Explanation:
Step 1: Given data
Enthalpy change (ΔH): 27 kJ/molEntropy change (ΔS): 0.09 kJ/mol.KAbsolute temperature (T): 300 KStep 2: Calculate the Gibbs free energy change (ΔG)
We can calculate the Gibbs free energy change using the following expression.
ΔG = ΔH - T × ΔS
ΔG = 27 kJ/mol - 300 K × 0.09 kJ/mol.K = 0 kJ/mol
Since ΔG = 0 kJ/mol, the process in not spontaneous nor non-spontaneous.
Can someone pls pls help me with these questions?!?!
Answer:
13) What common form of energy (not including kinetic or potential) is not included in the “Energy Symbols” key that would normally be present in these examples?
1) Sound Energy
2) Magnetic Energy
14)Look carefully at each of the four systems shown above. Knowing what we have discussed about energy conversions, identify (list) at least three different places where this form of energy (sound) should be “produced”.
1) When you open the water tap, in the turbine and the sound of the light bulb.
2) In the light bulb
3) The sound of the kettle, the turbine and when water is boiling.
4) The movement of the wheel of the bicycle, the turbine and the light bulb.
what is the major role of wind on earth?
Answer: Wind, in climatology, the movement of air relative to the surface of the Earth. Winds play a significant role in determining and controlling climate and weather.
Helpppppp ASAP I will give correct answer brainliest 
Answer: capillaries are not used to exchange substances between the body cells
Explanation:
Arteries carry blood away from the heart. Veins carry blood to the heart except the hepatic portal vein. Capillaries are used to exchange substances between body cells.
H2O2 is what type of compound?
Mention any two uses of oxygen gas.
Answer:
steel, plastics
Explanation:Hope it helps!
Copper and silver react with water to liberate H2O gas true or false
Answer:
well I think it's false
I hope it helps
have a nice day
#Captainpower
. Which of these types of electromagnetic radiation has the lowest energy?
a. Radio waves
b. Visible light
c. Gamma rays
How many moles are there in 100g of helium
Explanation:
so for this one u need to remember this equation and use it to find out moles= mass /mr . Mr of helium is 4
so moles= mass /mr
=100/4
=25 moles
hope this make sense:)
How many Liters of water do you need to make 8g 10 HSiCl3 +15H,0—1 HS11001+30 HCI
A.9.81 L of water
B..015 L of water
C.2.45 L of water
D.6.51 L of water
Answer:
A maybe I said maybe hope help
Explanation:
..
i need to do a science project and i have to write about "reducing ocean pollution" could anybody give my ideas? THANKS CHICAS
Answer:
decomposers
Explanation:
I'm not sure weather your supposed to create an actual experiment or write a paper. If an experiment, test certain acids to see which one can decompose plastics the fastest and determine which one can be spread through the oceans to melt down plastic. If a paper, discuss the idea of genetically modified fish. Some animals in the wild have the ability to eat pollution (wrappers, bottles, ect.), so mutating fish such as bottom feeders to be able to do the same would easily rid the water of pollution and make for one interesting of a paper! hope this sort of helped!
what might happen if the strong force didnt exist
Answer:
Atomic nuclei would fly apart
Explanation:
What color will the
flame turn if we
immerse a steel
wire in a barium
chloride solution and
then heat it? Why does that happen?
Answer:
Clean a platinum or nichrome (a nickel-chromium alloy) wire by dipping it into concentrated hydrochloric acid and then holding it in a hot Bunsen flame. Repeat this until the wire produces no color in the flame.
What is the acceleration of a 7 kg
mass being pulled by a 56 N force?
Answer:
8 meters per second per second
Explanation:
Newton's second law: [tex]f=ma[/tex], force = mass multiplied by acceleration.
Therefore 56 / 7 = acceleration = 8
down there (pls hurry!!)
How many liters of hydrogen are obtained from the reaction of 4.00 g sodium with excess water, at STP?
Answer:
V = 1.95 L.
Explanation:
Hell there!
In this case, according to the following reaction between sodium metal and water:
[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]
We can realize that the moles of hydrogen can be calculated by using the initial mass of sodium, its atomic mass (23.0 g/mol) and the 2:1 mole ratio of sodium to hydrogen to obtain:
[tex]4.00gNa*\frac{1molNa}{23.0gNa} *\frac{1molH_2}{2molNa}=0.0870molH_2[/tex]
Finally, we calculate the volume of hydrogen by using the ideal gas equation whereas the pressure is 1 atm and the temperature 273.15 K according to the STP conditions:
[tex]PV=nRT\\\\V=\frac{nRT}{P}\\\\V=\frac{0.0870mol*0.08206\frac{atm*L}{mol*K}*273.15 K}{1 atm}\\\\V=1.95L[/tex]
Regards!
Explain what will happen to the organisms that is affected by human activities.
Answer:
Human activity is by far the biggest cause of habitat loss.
Humans are now responsible for causing changes in the environment that hurt animals and plant species. We take up more space on Earth for our homes and cities. We pollute habitats. ... Human activity often changes or destroys the habitats that plants and animals need to survive.
Explanation:
Human activities are the various actions for recreation, living, or necessity done by people. For instance it includes leisure, entertainment, industry, recreation, war, and exercise.
Over time, destruction of such habitats leads to reduced biodiversity, weakening the Earth's ecosystems, and ultimately posing a major threat to human life. While, significant tracts of habitat have been lost, and along with them many species of plant and animal, steps can be taken to slow and even reverse the process.
One of the most significant ways in which humans have impacted on the lives of other species is by causing climate change. Many animals, including birds and frogs, now breed much earlier in spring in Britain than they did 20 years ago. Whether or not this is having a harmful effect on them has yet to be determined.
what things are needed to form a hail storm?
Answer:
Hail is a type of precipitation, or water in the atmosphere. Hail is formed when drops of water freeze together in the cold upper regions of thunderstorm clouds. These chunks of ice are called hailstones. Most hailstones measure between 5 millimeters and 15 centimeters in diameter, and can be round or jagged.
Explanation:
~I will give the brainliest ~
Will the solubility of PbCl2 in 0.10 Molar PbBr2 be larger than, smaller than, or the same as in pure water?
A. the same
B. smaller
C. larger
D. cannot be determined
Answer:
Smaller
Explanation:
I took the test
Determine the grams of water produced when 250 grams of barium hydroxide react
with 125 grams of HCI. Refer to the balanced equation below.
Ba(OH)2 (aq) + 2HCl (aq) --> 2H2O (l) + BaCl2 (aq) (balanced)
Answer:
Explanation:
Ba(OH)₂ (aq) + 2HCl (aq) --> 2H₂O (l) + BaCl₂ (aq)
171 g 2 x 36.5 g 2 x 18 g
73 g of HCl reacts with 171 g of Ba(OH)₂
125 g HCl reacts with 171 x 125 / 73 g of Ba(OH)₂
= 292.8 g of of Ba(OH)₂
Ba(OH)₂ available is 250 g , so it is the limiting reagent .
171 g of Ba(OH)₂ forms 36 g of water
250 g of Ba(OH)₂ forms 36 x 250 / 171 g of water
= 52.63 g of water.
Why are scientists using acoustic surveys to learn about rainforest diversity
Answer:
Acoustic survey data can help inform scientists about the locations of the rainforest with the highest biodiversity. ... By working with these companies, The Nature Conservancy can help inform them of where they might try to create wildlife corridors or connected habitats on their lands
Two samples of hot unknown metals of equal temperatures are dropped in separate containers of water at 30 degrees Celsius. The final temperature of sample A is 33.5 degrees, and the final temperature of sample B is 31.8 degrees. Which metal sample had the highest specific heat?
Answer:
Sample B has the highest specific heat
Explanation:
Specific heat of a material is defined as the heat necessary to increase in the temperature of 1g of material in 1°C.
The material with the highest specific heat requires more energy to increase its temperature.
In the problem, sample A and B are under the same amount of energy but sample A increases more its temperature. That means sample A has the lowest specific heat and:
Sample B has the highest specific heat