A student wants to use the lever to lift the book. At
which point should she push downward to use the
least amount of force to lift the book?
Answers
Since d is the furthest point from the fulcrum the least amount of downward force need be applied.
Related Questions
What are the units for speed
A. m/s
B. km/s ^ 2
C. m/s^2
D. m^2/s^2
Answers
m/s is the correct answer of them.
How does oxygen become an ion with a -2 charge?
A. they gain two electrons
B. they lose two electrons
C. they share two electrons
Answers
Answer:
they gain two electrons
Explanation:
because they gain negativity :)
If the number of atoms of each element on the reactant side of an equation is equal to the number of atoms of each element on the product side of the equation, the equation is _____.
A.)endothermic
B.)equal
C.)balanced
D.)exothermic
Answers
How many mols is 8.86 x 1023 atoms of silver?
Answers
Answer:
1.44moles
Explanation:
Given parameters:
Number of atoms = 8.86 x 10²³atoms
Unknown:
Number of moles = ?
Solution:
From the mole concept;
Number of moles = [tex]\frac{number of atoms }{6.02 x 10^{23} }[/tex]
Number of atoms = 8.86 x 10²³atoms
Number of moles = [tex]\frac{8.68 x 10^{23} }{6.02 x 10^{23} }[/tex]
Number of moles = 1.44moles
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
How many copper (Cu) atoms are there in Cu(NO3)2?
Answers
What is the approximate total number of atoms in 1.0 mole of lithium?
Answers
Answer:
6.0 x 10 to the power of 23
The geocentric theory was once accepted as an explanation of how objects were positioned in our solar system. Which statement best explains this theory?
A The orbits of the planets are elliptical and not circular
B The Sun is considered to be the center of the Universe
C Earth is considered to be the center of the revolving planets and stars
D The Sun is considered to be the center of the revolving planets and stars
Answers
Answer: c
Explanation:
Two gases are combined and sealed in a 2.0 L container. The 3.0 L of argon gas and 1.0 L of xenon gas each exert 1.00 atm pressure on the walls of their container.
(a) Calculate the partial pressure of each gas in the 2.0 L container.
(b) What is the total pressure in the 2.0 L container?
Answers
Answer:
Unless they chemically react with each other, the individual gases in a mixture of gases do not affect each other’s pressure. Each individual gas in a mixture exerts the same pressure that it would exert if it were present alone in the container . The pressure exerted by each individual gas in a mixture is called its partial pressure.
Explanation:
Realice las siguientes conversiones: a) 72°F a °C, b) 213.8°C a °F, c)180°C a K, d) 315K a °F, e) 1750°F a K, f) 0K a °F.
Answers
Answer:
a) 72 °F= 22.22 °C
b) 213.8 °C= 416.84°F
c) 180 °C= 453.15 °K
d) 315 °K= 107.33 °F
e) 1750 °F= 1227.594 °K
f) 0 °K= -459.67 °F
Explanation:
Para realizar el intercambio de unidades debes tener en cuenta las siguientes conversiones:
Fahrenheit a Celsius: [tex]C=\frac{F-32}{1.8}[/tex]Celsius a Fahrenheit: °F= °C*1.8 + 32Celsius a Kelvin: °K= °C + 273.15Kelvin a Fahrenheit: F= (K -273.15)*1.8 + 32Fahrenheit a Kelvin:[tex]K=\frac{F-32}{1.8} + 273.15[/tex]Entonces se obtiene:
a) 72 °F= [tex]\frac{72-32}{1.8}[/tex]=22.22 °C
b) 213.8 °C= 213.8*1.8 + 32= 416.84°F
c) 180 °C= 180°C + 273.15= 453.15 °K
d) 315 °K= (315 -273.15)*1.8 + 32= 107.33 °F
e) 1750 °F= [tex]\frac{1750-32}{1.8} + 273.15[/tex]= 1227.594 °K
f) 0 °K= (0 -273.15)*1.8 + 32= -459.67 °F
HELP THIS IS DUE BY 11:59 TONIGHT ITS CURRENTLY LIKE 11:40??
identify: one herbivore, one carnivore, one omnivore, and one decomposer.
Answers
herbivore: cow
carnivore: lion
omnivore: bear
decomposer: water mold
Answer:
rabbit, kingfisher,lizard, fungi
Explanation:
hrbivore is an organism which feeds on plants. carnivore is also an organism that feeds on other organism. omnivore is also an organism that feeds on other organisms. Decomposers arsle organisms that recycle nutrients.
Define conversion factor
Answers
Q.3.Which of the following chemical reactions is an acid-base reaction?
a. 4 C5H90 (1) + 29 02 (9) - 20 CO2 (g) + 18 H20 (9)
b. Ca (s) + F2 (g) - CaF2 (s)
c. HBr (aq) + NaOH(aq) - H20 (1) + NaBr (aq) O
d. 3 Pb (s) + 2 H3PO4 (aq) - 3 H2 (g) + Pb3(PO4)2 (aq)
Help me out please I'll make you brainliest answer
Answers
Answer:
C
Explanation:
Hbr is acidic
NaOH is a base
plus u get a salt from this equation as well as water
thank me later kid
Ice melting in a glass of iced tea is an example of a(n) __________ process (not necessarily a chemical reaction).
Answers
Which element tends not to react with other elements?
A
xenon
B
hydrogen
C
phosphorous
D
potassium
Answers
Answer:
I believe the answer is Xenon since it is a noble gas
Answer:
I think the answer is A
Explanation:
If im wrong the answer is C
When a student squeezes a balloon, it changes shape. In which state of
matter is the substance inside the balloon?
Answers
Answer:
gas
Explanation:
Answer:
Liquid and gas
Explanation:
When molybdate (MoO3) and Zinc (Zn) are heated together they react in this equation:
3Zn + 2MoO3 → Mo2O3 + ZnO
What is the mole ratio of Zn to Zno?
Answers
Answer: The mole ratio of Zn to ZnO is 3: 3.
Explanation:
According to law of conservation of mass, mass can be neither be created nor be destroyed. The mass on reactant side must be equal to the mass on product side. Thus the atoms of each element on both side of the reaction must be same.
The balanced chemical reaction is:
[tex]3Zn+2MoO_3\rightarrow Mo_2O_3+3ZnO[/tex]
Here 3 moles of Zn combine with 2 moles of [tex]MoO_3[/tex] to give 1 mole of [tex]Mo_2O_3[/tex] and 3 moles of [tex]ZnO[/tex]. Thus the mole ratio of Zn to ZnO is 3: 3.
Voltalc cells produce a positive overall charge. What does this indicate?
OA. The reaction is likely to be endothermic.
OB. The reaction is spontaneous.
OC. The reaction is not likely to occur.
OD. The reaction is not spontaneous.
Answers
Answer:
The reaction is spontaneous.
Explanation:
If voltaic cell show positive charge it means reaction is spontaneous taking by itself.
Answer:
B. The reaction is spontaneous.
Explanation:
Edmentum
Write 0.000 000 000 402 000 in scientific notation.
Answers
Answer:
0.000000000402000 in scientific notation is 4.02000 × 10-10
Drew added yeast and sugar to lukewarm water and placed it in a flask. He
stretched a balloon over the opening of the flask. After several minutes, he noticed
small bubbles rising along the side of the flask as the balloon slowly began to inflate.
Drew concluded that -
A)a physical change was occurring
B) the bubbles indicated a chemical change
C) the water surger and yeast were products of a chemical reaction
D) the strong smell was evidence of a physical changer
Answers
Drew added yeast and sugar to lukewarm water and placed it in a flask. Drew concluded that the bubbles indicated a chemical change. The correct option is B)
What are chemical changes?A chemical change is a change when the identity of a substance changes, and it converts into a new substance with new characteristics and a new identity.
When iron comes in contact with oxygen, it changes into rust, and it is a chemical change. A chemical change is a transformation in which the substance's chemical composition is altered through atom rearrangement. Atomic alterations cause changes in the molecular structure.
In the reaction, when yeast reacts with lukewarm water it forms bubbles, and in cold water, yeast does not perform well.
Therefore, the correct option is B) the bubbles indicated a chemical change.
To learn more about chemical changes, refer to the link:
https://brainly.com/question/29715141
#SPJ2
A farmer selectively breeds tomatoes to be shipped to grocery stores across the United States. Which of the following genetic traits would it be most important to selectively breed in the tomatoes?
A.The spoiling time of the tomatoes
B.The flavor of the tomatoes
C.The appearance of the tomatoes
D.The size of the tomato plants' leaves
Answers
Answer:
D
Explanation:
It would definitely affect size because breeding will change that trait
In selectively breeding tomatoes to be transported around the united states, one must consider the spoiling time of the tomatoes.
Tomatoes are vegetable fruits that are commonly consumed across the world and are very important because of their nutritive value. Often times, tomatoes are regarded as perishable goods because of their short shelf life.
In selectively breeding tomatoes to be transported around the united states, one must consider the spoiling time of the tomatoes.
Learn more about tomatoes:https://brainly.com/question/8908511
(05.02 LC)
How many moles of each element are in one mole of Sr(HCO3)2? (3 points)
Answers
Answer:
The number of moles of Sr in one mole of Sr(HCO₃)₂ = 1 mole
The number of moles of H in one mole of Sr(HCO₃)₂ = 2 moles
The number of moles of C in one mole of Sr(HCO₃)₂ = 2 moles
The number of moles of O in one mole of Sr(HCO₃)₂ = 6 moles
Explanation:
The given chemical formula of the compound is Sr(HCO₃)₂
The number of atoms of Sr in the compound = 1
The number of atoms of H in the compound = 2
The number of atoms of C in the compound = 2
The number of atoms of O in the compound = 6
The number of atoms of each element present in each formula unit of Sr(HCO₃)₂ is proportional to the number of moles of each atom in one mole of Sr(HCO₃)₂
Therefore;
The number of moles of Sr in one mole of Sr(HCO₃)₂ = 1 mole
The number of moles of H in one mole of Sr(HCO₃)₂ = 2 moles
The number of moles of C in one mole of Sr(HCO₃)₂ = 2 moles
The number of moles of O in one mole of Sr(HCO₃)₂ = 6 moles.
Answer:
the answer above is correct
Explanation:
i took the test
mixture is a
Pek the word that best completes the following sentence. A
mixture in which the composition is uniform throughout the mixture.
homogeneous
heterogeneous
compound
Need at
Answers
Answer:
compund
Explanation:
i took the quiz
Given the following data, calculate the densities of a carbon-14 nucleus and a carbon-14 atom. Particle Mass Electron kg Proton kg Neutron kg The diameter of the nucleus is about cm and electrons move about the nucleus at an average distance of about cm away from it. (a) Calculate the density of a carbon-14 nucleus. Density
Answers
How many molecules are in 0.56 moles of NH3?
Answers
Answer:
8.9x1023
Explanation:
1. Below is a diagram of an atom. Which particles are found at "A"?
Answers
TEST QUESTION PLS HELP What are isotopes? Write isotopes of three different elements, showing their atomic number and mass number. (I'll give brainliest)
Answers
Answer:
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element's atomic number on the Periodic Table
Explanation:
Hope this helps some? :)
2. Which situation best represents conduction?
A. Heat from a campfire
B. A hot air balloon taking off
C. Touching a hot piece of metal
D. Getting sunburned
Answers
Answer:
c
Explanation:
touching a hot piece of metal. because the energy or the hotness of the pot is touching your hand which is a direct contact.
What Period # is this element found in? P
Answers
What is the function of the urinary system?
Answers
Answer:
Explanation:
The Urinary System's function is th filter blood and create urine as a waste by-product
Please give brainliest
Answer:
The urinary system's function is to filter blood and create urine as a waste by-product. The organs of the urinary system include the kidneys, renal pelvis, ureters , bladder and urethra.
I HOPE IT HELPS ❤❤How many significant figures does 0.058 040 have?
a.6
b.7
c.5
d.4
Answers
Answer: c 5 because you don’t start counting until it hits a number >0 if it’s to the left of a decimal
Explanation:
