Gan astronaut stands on the surface of the moon and drops a dictionary (with a mass of 8 kg ) and a cell phone (with a mass of 200 g ) at the same time from the same height. which will hit the ground first? ignore the effects of atmospheric friction. there is not enough information to say which will hit first. the dictionary will hit the ground first. the cell phone will hit the ground first. they will hit the ground at the same time.

they will arrive to the groundat same time

Explanation:

To find which statement is correct, let's consider solving this problem, let's use Newton's second law to find the acceleration of each body

Dictionary

       W₁ = M a₁

       M g = M a₁

       a₁ = g

Mobile

      W₂ = m a₂

      m g = m a ₂

      a₂ = g

      a₁ = a₂

We can that the two bodies have the same acceleration, as they leave the same height and from rest, we must conclude that they will arrive to the groundat same time

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000