Answer:
20m/s
Explanation:
Given parameters:
Distance of throw = 50m
Time = 3s
Unknown:
Average speed = ?
Solution:
Average speed is distance divided by time;
Average speed =
Insert the parameters and solve;
Average speed = = 16.66667m/s = 20m/s
Answer:
Some work input is lost to friction
Explanation:
The efficiency of a machine is defined as:
(1)
where
is the work output
is the work input
Due to the law of conservation of energy, the work output can never be larger than the work input (because energy cannot be created). Moreover, in real machines part of the work input is lost due to the presence of frictions: as a result, part of the energy in input is converted into thermal energy or other forms of energy, and so the work output is smaller than the work input, and so the ratio (1) becomes less than 1, and so the efficiency is less than 100%.
Answer:
Explanation:
The Bernoulli equation is:
(1)
Now let's apply the equation (1), for our case:
(2)
here we assume that h is the same in both cases so it canceled out.
Solving the equation for v₁ we have:
(3)
Now, we know that pressure P=F/A (force over area)
(4)
Combining (3) and (4), we can find v1.
I hope it helps you!