Answer:
(a). The weight of spacecraft at height 6450 km is .
(b). The weight of spacecraft at height 33700 km is 182.46 N.
Explanation:
Given that,
Radius of earth = 6450 km
Weight of spacecraft = 7070 N
We need to calculate the weight of the spacecraft at a height 6450 km above Earth’s surface
Using formula of weight
Where, W = weight of spacecraft
h = height
Put the value into the formula
(b). We need to calculate the weight of spacecraft at height 33700 km
Using formula of weight
Hence, (a). The weight of spacecraft at height 6450 km is .
(b). The weight of spacecraft at height 33700 km is 182.46 N.
Answer:
Image result for In covalent bonds what is being shared
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
Answer : The half-life of this substance will be, 45 minutes.
Explanation :
First we have to calculate the value of rate constant.
Expression for rate law for first order kinetics is given by:
where,
k = rate constant = ?
t = time passed by the sample = 90.3 min
a = initial amount of the reactant = 400
a - x = amount left after decay process = 100
Now put all the given values in above equation, we get
Now we have to calculate the half-life of substance, we use the formula :
Therefore, the half-life of this substance will be, 45 minutes.