The picture below shows a storage tank in which a farmer stores his grain. The tank is madeup of a right cylinder with a hemisphere on top. The perpendicular height of the tank to thetop is 7 500 cm and the radius of the tank is 10 m. 7.1 Calculate the total surface area of … Read more
Learners investigated the relationship between the concentration of a silver nitrate (AgNO3) solution and its conductivity at a constant temperature. They set up the apparatus, as shown below, and recorded the current. The initial reading of the ammeter was taken before anhydrous AgNO3 was added to distilled water. The anhydrous AgNO3 was added to 200 … Read more
Dolphins communicate through the emission and reception of sounds. A young dolphin was separated from its mother and started whistling at a frequency of 130 kHz to call her. The speed of sound in seawater is 1480m∙s-1. 7.1 Explain the term ultrasound. (2) 7.2 Calculate the wavelength of the young dolphin’s whistle. (4) 7.3 Another … Read more