Explanation:
It is given that,
Speed of the spacecraft, v = 71 km/s = 71000 m/s
Distance between the spacecraft and the Sun,
It is required to proof that its orbit about the sun was closed and therefore elliptical. Let v is the speed with which the spacecraft if it is moving in circular path. It is given by :
M is the mass of the sun,
v = 55698 m/s
or
v = 55.6 km/s
The given velocity is 71 km/s while the calculated value of velocity is 55.6 km/s. It is clear that the path is not circular. It is elliptical. Hence, this is the required solution.
Answer:
Work done, W = 39.2 J
Explanation:
It is given that,
Mass of the block, m = 2 kg
The block is lifted vertically 2 m by the man i.e the distance covered by the block is, h = 2 m. The man is doing work against the gravity. It is given by :
Where
g is acceleration due to gravity
W = 39.2 J
So, the work done by the man is 39.2 J. Hence, this is the required solution.
Answer:
Four days during one year sun directly overhead at noon in new york city...
The north and the south of the globe are magnitized and the needles of a compass are magnetized. Since positives attract negatives. The negative end of the earth attarcts the positive point of the needle to point towards it. The same happens with positive end of the earth and the negative point of the needle.
In a process called “photosynthesis,” plants use the energy in sunlight to convert CO2 and water to sugar and oxygen. The plants use the sugar for food; food that we use, too, when we eat plants or animals that have eaten plants and they release the oxygen into the atmosphere.
So it’s PHOTOSYNTHESIS