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:
Explanation:
speed of light = 3 x 10⁸ m /s .
distance between moon and the earth = 3.77 x 10⁵ x 10³m .
Time taken by light to cover the distance
= distance / speed
= 3.77 x 10⁸ / 3 x 10⁸
= 1.256 s
Answer:
validate
Explanation:
<u>Law of Conservation of energy</u>
According to the law of conservation of energy, energy of a body or a system gets transferred to another system as different energy. We cannot create energy nor we can destroy energy. Energy is always transformed into other forms of energy.
In the context, Joe noticed that the aquarium's temperature dropped during the night and he concluded that according to the law of conservation of energy, the energy of the aquarium in terms of thermal energy is being transferred to the surrounding air.
This is because the aquarium is considered to be an open system where energy can come in and move out.
Hence Joe's statement is valid.