As the gravitional force acting on objects is different for different planets, our weight will differ in different planets. In some, it may increase while in some, it may decrease.
MARK IT BRANLIEST PLZ....
As we know that work done is defined as product of force and displacement in the direction of applied force
so we can say it is
or we can say
so we will have following options
A)Pushing against a locked door
There is no work done in above case as there will be no displacement in that case so work done is ZERO
B) Carrying a box down a corridor
While we move done and carrying a box then work done by gravity on the box while our work done is negative work.
C) Pulling a trailer up a hill
In above case our work done to pull a box up a hill is positive work as we need to work against gravity
D) Suspending a heavy weight with a strong chain
During suspension there is no displacement so there will be no work done in above case
so correct answer will be
<em>Pulling a trailer up a hill</em>
Answer:
16.82 kJ/g
Explanation:
The Heat energy generated by the pentance combusion caused the temperature increasing of the caloriemeter and the water inside it.
Heat energy of a substace can be calculated using
Q = mcθ
C= mc
where Q = Heat energy
m =mass
c = specific heat capacity
C = heat capacity
θ =temperature difference
(Temperature difference = final temperature - initial temperature.)
heat absorbed by water = mcθ
= 1 * 4.184 * (22.82-20.22)
= 10.88 J --------------(1)
heat absorbed by calorimeter = Cθ
= 2210 *(22.82-20.22)
= 5746 J ---------------(2)
Combustion energy = heat absorbed by water + heat absorbed by calorimeter
Combustion energy = 10.88+ 5746 = 5756.88 J
= 5.757 kJ
heat of combustion of pentane = Combustion energy / mass
= 5.757 / 0.3423
= 16.82 kJ/g
Answer:
Explanation:
The total force on the particle is given by
Then, by replacing we have:
where the cross product can be made with the determinant method.
Hope this helps!!
Answer:
Al2O3 + 3Mg ===》 3MgO + 2Al
Explanation:
Reaction of aluminium oxide with magnesium metal would form magnesium oxide and aluminium metal.
Balancing the stoichiometric equation, the number of atoms at the reactant must be equal to the number of atoms at the product so that law of conservation of matter must hold.
Al203 + 3Mg ====》 3MgO + 2Al
2 aluminium at reactant = 2 aluminium at product
3 oxygen at reactant = 3 oxygen at product
3 magnesium at reactant = 3 magnesium at product.