DESIGN BRIEF SCENARIO

MR Janson has a big house in Town. He wants to do lights replacement inside the house. He requested an electrician Mr. Buthelezi to fix the lights in his house. The electrician asked Vryheid Comprehensive Technology learners in Grade 9 to design and make an electrical circuit for Mr. Janson. The electrical circuit must include a light bulb, Switch, and wire.

SECTION A
1. Describe the problem.

2. Who will benefit when you solve the problem.

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length