Physical Science

Two small identical metal spheres on insulated stands carry charges of +4,2 × 10-9 C   and -6,8 × 10-9 C respectively. They are placed at a distance of 0,3 m apart. 8.1 State Coulomb’s law in words. (2) 8.2 Calculate the magnitude of the electrostatic force that the one charge exerts on the other. (3) … Read more

An experiment is set up to determine the relationship between the DEGREE OF DIFFRACTION and WAVELENGTH of light. Blue light is passed through a single slit and the pattern formed is observed.  The experiment is now repeated with green light and then with red light. The distance between the light source and the slit remains … Read more

A light ray is incident on a glass prism. The angle of incidence is 38°, as shown below.The refractive index of glass is 1,5 and that of air is 1. 6.1 Define the term angle of refraction. (2) 6.2 Calculate the angle of refraction inside the glass prism. (3) 6.3 Redraw the glass prism in … Read more

A 6 kg block, held at rest on a rough horizontal table, is connected to another block of  mass 3 kg by a light inextensible string passing over a frictionless pulley. The 3 kg block hangs vertically, as shown in the diagram below.  When the 6 kg block is released, it accelerates to the right … Read more

A 4 kg block is pulled up along a frictionless incline by a constant force F acting parallel  to the incline, as shown below. The incline makes an angle of 30° with the horizontal. The block moves at CONSTANT VELOCITY. 3.1 State Newton’s First Law of Motion in words. (2) 3.2 Draw a labelled free-body … Read more

A billboard, mass 15 kg, is suspended from a roof by means of a light inextensible string. Force F pulls the billboard sideways, as shown in the diagram below. When the angle between the roof and the string is 40°, a closed vector diagram is obtained for all the forces acting on the billboard. 2.1 … Read more