An object of mass 5.0 kg falls vertically through still air. The air resistance acting on the object has a constant value of 50 N. Which of the following statements…

A supermarket has a large open-topped deep freezer to keep products frozen but still visible to customers. Which statement about the air in this freezer explains why the products remain…

The diagram shows the forces acting on a cyclist as she accelerates at 4.0 m s –2 on a straight, horizontal section of road. The constant resistive forces are air…

Here are four statements about light:1 In a vacuum, green light travels faster than blue light.2 In a vacuum, the wavelength of red light is greater than the wavelength of…

Below are four statements about electromagnetic waves.1 Microwaves have a smaller wavelength than visible light.2 The speed of visible light in a vacuum is higher than the speed of other…

A student carries out an experiment to determine the density of the material from which two identical solid objects are made. She uses a balance and a measuring cylinder containing…

The colour of the surface of an object has an effect on the rate of infrared radiation that it absorbs and emits. As a result of this, some clothes which…