The force acting on his feet.
Running on sand requires 1.6 times more energy spent than running on hard surface, so the force applied by our foot on sand is less.
Answer:
The mass of object is 300g.
Its weight on earth is W×0.3kg×9.8m/s2=2.94 N
Its weight on moon is A 300 g would be 48 g on the moon
GOOD LUCK!
Answer: 3,893,845.918 Ping-Pong balls
Explanation:
The volume of an average room is:
(1)
(2)
Now let’s transform this 
to units of 
, knowing 
:
(3)
On the other hand, we have Ping-Pong balls with a radius 
, and their volume is given by:
(4)
(5)
(6)
Now, the number 
of Ping-Pong balls that can be packed into the room is:
(7)
(8)
This is the number of Ping-Pong balls that can be packed into an average size room
