For each question below,o state what equation you are using for the first mark and show how the data is inserted into the equation along with the final answer for the second mark.
A1.Two forces of 8 N and 15 N act at right angles to each other. Calculate them a gnitude of the resultant force.[2]
A2.A body with a 5.0 kg mass is dropped from the top of a 20m tower to the ground.How much gravitational potential energy does it have just before it is dropped?[2]
A3. A 2.0 V cell is used with a potentiometer to find the emf of an unknown battery. With the 2.0 V cell in place the wire has a length of 136 mm and with the unknown battery in place the length changes to 612 mm. What is the emf of the unknown battery? [2]
A4. What is the wavelength of BBC Radio 2 which broadcasts at a frequency of88.1MHz?[2]
A5.A small object is placed a distance of 15 cm to the left of a convex converging lens and produces an image that is 30 cm to the right of the lens. Calculate the focal length of the lens.
