4. Three identical springs A, B and C of negligible weight are arranged as shown the figure below. A
معمموهم
6
If C stretches by 3cm and bar xy is assumed to be weightless. Determine
(i) the spring constant.
(2mk
(2ml
(ii) the extension in A.

Aplanet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass m 2.75 x 1029 kg. the radius of the orbit is r 8.05 x107 km. what is the orbital period (in earth days) of the planet tplanet?

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?