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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 at²(as u is 0 s= 1/2 at²)

s = 1/2 x 9.81 x 1.8²

Answered by Gabriella L. • Physics tutor

2505 Views

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 conceptualise...

Answered by Meg F. • Psychology tutor

3699 Views

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 compl...

Answered by Alice T. • Biology tutor

5081 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 val...

Answered by Daniel H. • Chemistry tutor

3223 Views

Find the value of the discriminant of x2 + 6x + 11

For a quadratic equation in the form ax^2+bx+c=0 the determinant is given by b^2-4ac and is used to help identify the types of roots of the equation. In this case, the determinant is (6)^2-4(1)(11) which ...

Answered by Emily C. • Maths tutor

8526 Views