Question

1. (a) What is a dimensionless quantity? (b) The frictional force, f between a box of mass, m and a table is given by f = ? mg. where g is the acceleration due to gravity. Show that the coefficient of friction, ? is dimensionless. 2. (a) Define spring constant, k of a spring. (b) A helical spring is stretched by an amount, e, under a constant force, F. Show that the energy stored in the spring depends only on k and e. 3. (a) What is a laser? (b) State two uses of a laser beam. 4. State one application of a magnet in each of the following areas of activity: (a) Exploration and Navigation; (b) Industry and Constructional sites; (c) Medical. 5. Draw a section of the structure of a fibre optics cable showing: (a) the core; (b) the cladding; (c) signal transmission through it.

          1. (a) What is a dimensionless quantity?
(b) The frictional force, f between a box of mass, m and a table is given by
f = ? mg.
where g is the acceleration due to gravity. Show that the coefficient of friction, ? is dimensionless.

2. (a) Define spring constant, k of a spring.
(b) A helical spring is stretched by an amount, e, under a constant force, F. Show that the energy stored in the spring depends only on k and e.

3. (a) What is a laser?
(b) State two uses of a laser beam.

4. State one application of a magnet in each of the following areas of activity:
(a) Exploration and Navigation;
(b) Industry and Constructional sites;
(c) Medical.

5. Draw a section of the structure of a fibre optics cable showing:
(a) the core;
(b) the cladding;
(c) signal transmission through it.

1. (a) What is a dimensionless quantity?
(b) The frictional force, f between a box of mass, m and a table is given by
f = ? mg.
where g is the acceleration due to gravity. Show that the coefficient of friction, ? is dimensionless.

2. (a) Define spring constant, k of a spring.
(b) A helical spring is stretched by an amount, e, under a constant force, F. Show that the energy stored in the spring depends only on k and e.

3. (a) What is a laser?
(b) State two uses of a laser beam.

4. State one application of a magnet in each of the following areas of activity:
(a) Exploration and Navigation;
(b) Industry and Constructional sites;
(c) Medical.

5. Draw a section of the structure of a fibre optics cable showing:
(a) the core;
(b) the cladding;
(c) signal transmission through it.

Added by Margaret P.

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