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what words describe the following movements: a) If I move my arm from down by the side of my body and lift it to horizontal b) If I return my arm back to the side of my body

a) Abduction b) adduction
GL
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It takes 1.8s to drop a ball of a bridge. How high is the bridge and what speed is reached?

t= 1.8s a=-9.81ms - 2 v=u+at v= -9.81 x 1.8 =17.658 m/s s= ut + 1/2 at 2 (as u is 0 s= 1/2 at 2 ) s = 1/2 x 9.81 x 1.8 2 = 15.9m
GL
Answered by Gabriella L. • Physics tutor
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Is memory reliable?

P.E.E.P What memory is/ stance on question. Memory is a complex psychological construct, that can generally be seen as the storage and retrieval of information. Memory can be broadly conceptualised into shor...
MF
Answered by Meg F. • Psychology tutor
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Explain how the proteins troponin, tropomyosin, actin and myosin regulate muscle contraction.

When the muscle is relaxed, tropomyosin fibres wrap around the actin filament, covering up the sites at which myosin can bind with actin. During muscle contraction, Ca2+ ions bind to troponin complexes on th...
AT
Answered by Alice T. • Biology tutor
7285 Views

Why do the atomic radii of the elements decrease across a period on the periodic table.

It may seem counterintuative that as the elemets' atomic numbers increase their atomic radii decrease. This is due to the increased electrostatic attraction (coulombic interaction) between nucleus and valenc...
DH
Answered by Daniel H. • Chemistry tutor
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