The age of the oldest stars
,
Patterns of background radiation
,
How fast distant galaxies are moving away from us.
By definition this is the b) gravitational force.
Answer:

Explanation:
As we know that base of the slab is given as


now we know that rate of heat transfer is given as

here we know that

Also we have



Answer:15.8 m/s
Explanation:
Given
Gravitational Force 
Air resistance 
mass of Parachutist 
Velocity after 



Now Parachutist opens the parachute
Net for on Parachutist

drag force
therefore deceleration 
velocity after 10 s is


