The circulatory system, composed of the heart, veins,
arteries, capillaries, and blood, is a feature common in most vertebrates
(animals with a distinct spine). In these animals, blood never leaves the
confines of the heart and blood vessels, making theirs a closed circulatory
system. In regard to your question, the best answer is B. Some animals have
hearts that don’t have atria, while others don’t even have a distinct heart at
all.
Power is the rate of work done given by dividing work done by time.Efficiency is the ratio of work output to work input
power input= 100 watts
power output = x
efficiency= 0.8
thus 0.8 = x/100, therefore x = 80
power is given by energy times time
hence time = 80/300000 = 0.00026 seconds
Time in hours = 0.00026/360 = 7.407 x 10 ∧7 hours
Answer:
(a) Force must be grater than 283.87 N
(B) Force will be equal to 193.945 N
Explanation:
We have given mass of the crate m = 49.6 kg
Acceleration due to gravity 
Coefficient of static friction 
Coefficient of kinetic friction 
(a) Static friction force is given by 
So to just start the crate moving we have to apply more force than 283.87 N
(B) This force will be equal to kinetic friction force
We know that kinetic friction force is given by 
Answer:
1, their atoms have the same number of valence electron. because valence electron determine the group of elements.
Answer:
Student C
Explanation:
order from heaviest to lightest is...
9 kg (A) , 8000g (8 kg) (D) , 2800g (2.8kg) (B), 2 kg (C)
