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but i don't know how to do question 2? a. 40/2 = 20N b. 350mm - 250mm = 100mm c. 20 = 350k...?

By using Hooke's law F = kL... a. 10 = 25 x L, L = 0.4m b. F = 25 x 0.5 = 12.5N

1.A stell spring has a spring constant of 25Nm^-1.Calculate a.the extension of the spring when the tension in it is equal to 10N, b.The tension in the spring when it is extended by 0.50m from its unstretched length. 2.Two identical stell springs of length 250mm are suspended vertically...

so what should i do?

Can someone answer for me please...

oh yeah, for question (ii), should i just add up the two densities and divided by 2?...

i have done few simple questions by using p = m/v to calculate the mass, volume and density, but for this question, i don't know how to do it. Please help ^^" (a) Define the density of a material. >Density is the mass of the material per unit volume. (b)Brass, an alloy of copper and zinc...

What is meant by ths wave-particle duality of electrons?

--------------------- --------------------- ↓ ...↓ --------------------- ↓....↓ --------------------- ↓....↓ --------------------- Is it kindda look like this...?:confused:

Thankyou Very Much! ^^"

Hi, this is not my homework, I am revising Physics at the moment, I am stuck with this question.

Figure 1 shows part of an energy level diagram for a hydrogen atom. n=4 ------ -0.85eV n=3 ------ -1.50eV n=2 ------ -3.40eV n=1 ------ -13.60eV When an electron of energy 12.1eV collides with the atom, photons of three different energies are emitted. [a] on Figure 1 show with arrows...

The line y = x + 2 intersects the curve 4y + 3x^2 = 7 in two places. a) Find the coordinates of the two points of intersections. >Sub. y = x + 2 to 4y + 3x^2 = 7 >4(x+2) + 3x^2 = 7 >4x + 8 + 3x^2 -7 = 0 >3x^2 + 4x -1 = 0 >x = -1 and - 1/3 >y = x + 2 >so y = 1 or 5/3 The straight...