True
Gay Lussac's Law
When the volume is constant, the gas pressure is proportional to its absolute temperature
Answer : B) The cow pulls back on the girl.
From newton’s third law we know that every action has a reaction force pushing back. So when the girl pulls on a cow, the cow is pulling back on her.
Answer:
Explanation:
Given
Force 
one at an angle of 
East of North and another at West of North
Net Force is in North Direction
Forces in horizontal direction will cancel out each other
thus Work done will be by north direction forces
here 
Answer:
d) The molecules in A have more average kinetic energy per molecule than those in B
e) The molecules in A are moving faster than those in B
Explanation:
Given that
Size of boxes are equal
So volume of boxes = V
Temperature in box A =50°C = 323 k
Temperature in box B = 10°C = 283 K
We know that for ideal gas
P V = m R T
The mass of gases is not given so we can not say that which have high temperature.Also be can not say that which box have more molecule.
We know that average kinetic energy is directly proportional to the absolute temperature of gas that is why we can say that box A will have more kinetic energy because it have high temperature.We know that is gas have high kinetic energy then we can say that it have high moving velocity.
So the option d and e is correct.
d) The molecules in A have more average kinetic energy per molecule than those in B
e) The molecules in A are moving faster than those in B
Explanation:
The weight of the block is balanced by the normal force acting upon the block by the surface.
