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guapka [62]
3 years ago
6

A car is traveling at 20 minutes/second and is brought to rest by applying brakes over a period of 4 seconds.What is it average

acceleration over this time interval?
Chemistry
1 answer:
Neporo4naja [7]3 years ago
5 0

-5m/s

Explanation:

Given parameters:

Speed of the car = 20m/s

Time taken = 4s

Unknown:

Average acceleration = ?

Solution:

Acceleration is the change in velocity or speed with time of a body.

  Acceleration = \frac{v - u}{t}

 v is the final velocity = 0

 u is the initial velocity

 t is the time

Input the values:

   Acceleration = \frac{0-20}{4}  = -5m/s

learn more:

Acceleration brainly.com/question/3820012

#learnwithBrainly

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Why does the Periodic Table have that separated part (lanthanides and actinides) at the bottom?
zepelin [54]

In the periodic table the lanthanoid and the actinides are place separately at the bottom because of their electronic configuration and their properties compared to the other elements.

The  the lanthanoid and the actinides are place separately at the bottom in the periodic table due to their electronic configuration and the properties. and to make the periodic table more convenient . if we place the f block elements that is he lanthanoid and the actinides then the size of the periodic table will increase. the f block elements are called as the inner transition element.

Thus , to make the periodic table more convenient and to group the elements in the block the the lanthanoid and the actinides are place separately at the bottom.

To learn more about lanthanoid and actinide here

brainly.com/question/24390376

#SPJ4

3 0
1 year ago
A fossil was analyzed and determined to have a carbon-14 level that is 70 % that of living organisms. The half-life of C-14 is 5
Citrus2011 [14]

Answer: 2948

Explanation:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.69}{t_{\frac{1}{2}}}=\frac{0.693}{5730}=1.21\times 10^{-4}years^{-1}

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = 1.21\times 10^{-4}years^{-1}

t = age of sample  = ?

a = let initial amount of the reactant  = 100

a - x = amount left after decay process = \frac{70}{100}\times 100=70

t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{70}

t=2948years

Thus the fossil is 2948 years old.

5 0
3 years ago
At standard pressure, the difference between the freezing point and the boiling point of water, in Kelvin degrees, is D. 373 A.
zepelin [54]
Your answer would be A.100 
 
                                       

6 0
3 years ago
Nitrous oxide (n2o), or laughing gas, is commonly used as an anesthetic in dentistry and surgery. how many moles are present in
Gelneren [198K]

Answer is: 0.375 moles are present in 8.4 liters of nitrous oxide at stp.

V(N₂O) = 8.4 L.

V(N₂O) = n(N₂O) · Vm.

Vm = 22,4 L/mol.<span>
n</span>(N₂O) = V(N₂O) ÷ Vm.

n(N₂O) = 8.4 L ÷ 22.4 L/mol.

n(N₂O) = 0.375 mol.<span>
Vm - molare volume on STP.</span>

5 0
3 years ago
What are three similarities between biotic and abiotic factors?
Viktor [21]
1. Both part of the ecosystem
2. There are biotic objects on abiotic objects ( caterpillars on trees ) and abiotic objects on biotic things ( pollen on bees )
3. Both are made of atoms
6 0
3 years ago
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