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A footballer kicks a ball vertically upwards. Initially, the ball is stationary. His boot is in contact with the ball for 0.050s. The average resultant force on the ball during this time is 180N. The ball leaves his foot at 20m/s. Calculate the impulse

Impulse is Force x TimeThe force has been given as 180N. The time that the foot was in contact with the ball was 0.05sImpulse=FxtImpulse=180x0.05Impulse= 9Ns
SA
Answered by Sophia A. • Physics tutor
10020 Views

Examine the extent to which the President's power is the power to persuade

Originally claimed by Richard Neustadt, it can be argued that the President's power is in the power to persuade due to the lack of constitutional powers. The constitution gives legislative powers to Congress...
TH
16637 Views

How do I find and plot the roots of a polynomial with complex roots on an Argand diagram? e.g. f(z) =z^3 -3z^2 + z + 5 where one of the roots is known to be 2+i

For a polynomial with real coefficients, use that roots come in complex conjugate pairs. Therefore, another root is 2-i (and we know for this example that the final root must be real). Write the factorised f...
ES
6143 Views

There are 14 boys in a class and 16 girls. The Mean height of the class is 1.6m, the mean of the girls is 1.5m what is the mean height of the boys?

Mean for all students: (the sum of all the heights)/total number of students = (the sum of boys+sum of girls)/30 = 1.6sum of boys and girls = 1.6 x 30Mean for girls: (the sum of all the girls' heights)/total...
CJ
Answered by Caitlin J. • Maths tutor
5077 Views

How does an action potential travel across a cholergenic synapse?

An action potential arrives at synaptic knob. This causes voltage-gated Ca2+ ion channels to open, resulting in an influx of Ca2+ ions diffusing into the synaptic knob. This then causes vesicles containing a...
VF
Answered by Victoria F. • Biology tutor
2892 Views