Which of these is an example of competition between members of the same population in a community?
a.
a pride of lions chases away a pack of hyenas trying to eat their kill.
b.
a pride of lions works together to bring down a water buffalo.
c.
a lion and a cheetah clash while stalking a gazelle.
d.
a male lion chases after another lion that invaded its territory.
a. pride of lions chases away a pack of hyenas trying to eat their kill. ?

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.

What is the difference between mass density and weight density?

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.