How much will Guddy's school bag weigh in kg if it has 4 books of 100 g each and 3 books of 200 g each? ​

Answer:

Given :

Height (H) = 4.9 m

Initial horizontal velocity (u) = 4.5 m/sec

To Find :

Time taken by the stuntman to reach the ground.

Solution :

Velocity of the stuntman in y-axis = ucos∅

                                                        = 4.5×cos90

                                                        = 0

Therefore, applying the Kinematic equation for uniformly accelerated body,

s = ut + [tex]\frac{1}{2} [/tex]gt²

Where, s = distance covered; u = initial velocity; g = acceleration due to gravity; t = time taken

∴    H   = (0)t + [tex]\frac{1}{2} [/tex]gt²

⇒  4.9 =  0  +  [tex]\frac{1}{2} [/tex]×9.8×(t)²

⇒   t²  =  1

⇒   t    = √1

∴    t    = 1 s

The time taken by the stuntman to reach the ground  is 1 sec.

Therefore, option (c) is correct

Grignard's reagent is an organo-magnesium halide having the general chemical formula as (R-Mg-X) which is used to form a Carbon-Carbon bond and reduce an aldehyde or ketone to alcohol.

• "R" is the organic part of the compound. "X" is a halogen, otherly known as group 17 elements like Flourine, Chlorine, etc.
• The compound helps us to create the rather difficult C-C bond or carbon-carbon bond.

• In Grignard's reaction, the desired alkyl, allyl or any carbonyl group is added to the magnesium halide which is then reacted with an aldehyde or ketone to reduce it to alcohol and add the carbonyl group to the organic compound.

The reaction of water on methyl magnesium bromide in dry ether forms methane.

CH₃-Mg-Br + H₂0  --> CH₄ (methane) + Br-Mg-OH

The lone pair electrons on the oxygen atom attack the methyl carbon and remove the MgBr part from the compound and replace it with a Hydrogen atom to form methane.

The action of Zn-HCL on ethyl iodide is that it reduces ethyl iodide to ethane.

CH₃-CH₂-I + 2[H] [tex]\frac{Zn}{HCL}[/tex]-->  CH₃-CH₃ (ethane) +  HI

Zn/HCL acts as a reducing agent thus when reacted with ethyl iodide, the nascent Hydrogen atoms attack the iodine part of the compound and replace it thus forming ethane and Hydroflouride.

Hogalala was early man language

Answer:

hogalala was an ancient Egypt language in that time of people communicate with others

Answer:

70 percentage in Y.



Explanation:

Percentage of accumulation is time dependent factor as time proceeds accumulation also increases.

Hence species Y arises earlier then X

Answer:

Trait Y which exists in 70% (larger fraction) of the population, is likely to have arisen earlier because in asexual reproduction, identical copies of DNA are produced and variations do not occur.

New traits come in the population due to sudden mutation and then are inherited. 70 % of the population with trait Y is likely to have been replicating that trait for a longer period than 5 % of the population with trait X.

Explanation:

MARK ME BRAINLIEST