The area of triangle PQR is 42 cm 2 .The length of PR is 8 cm.cos ș = 3/4What is the length of QR, in cm? Answer:

An electric shower heater is rated at 8.4 kW and raises the temperature of flowing water from 16 °C to 36 °C. What is the mass of water passing through…

Dry air can be cooled and then fractionally distilled to separate its components. What is the minimum volume of dry air needed to prepare a 25 dm3 sample of oxygen…

A scientist studying the blue-ringed octopus made the following observations. It inhabits shallow coral reefs where water temperatures are between 26 °C and 29 °C. It feeds on crabs, shrimp…

Carboxylic acids react with alcohols to make esters. A small amount of concentrated sulfuric acid is used as a catalyst. Consider the following ester: What is the name of the…

The diagram shows changes in the structure of the uterus lining during the menstrual cycle in a healthy female. Two regions are labelled Q and R. S shows when ovulation…

Five congruent small rectangles are joined, as shown, to form one large rectangle. The large rectangle is mathematically similar to each of the small rectangles. For each small rectangle, find…

A solid cuboid has dimensions 0.20 m × 0.10 m × 0.10 m and density 2000 kg m–3. What pressure is exerted by the weight of the cuboid when it…