If a convex lens of focal length 12cm is used to produce a real image four times the size of the object, how far from the lens must the object be placed?

Find the effective resistance in the diagram above

The diagram above is the heating curve for a solid QR is the

14 N + 4 He → 17 O + X 7 2 8 In the equation above, the particles X is

The diagram above shows a plank RS pivoted its center of gravity O and is in equilibrium with the weight P and Q. If a weight 2P is added to P the plank will...

If electron are accelerated from rest through a potential difference of 10kv, what is the wavelength of the associated electron [m = 9.1 x 10-31kg, e = 1.6 x...

The efficiency of the pulley system shown above is 80%. find the effort E required to lift the load of 1200N

The above figure shows the motion of a progressive wave along a string. The particle motion of the medium is in direction

Given the inductor of inductance 5mH, 10mH and 20mH connected in series, the effective inductance is