1. A rubber cube of volume 0.8cm3 falls vertically through 6m onto a concrete floor. The cube .
experiences a maximum strain of 1.11% and remains in contact with the ground for 0.8s
before rebounding vertically upwards. Given that the cube impacted with the ground such
that one face of the cube was in complete contact with the ground, find the maximum EPE
stored in the cube at maximum strain.
Density of the cube = 0.9kgm3
A student suggests that the Ek of the cube on impact should be equal to the maximum EPE
stored. Justify whether you agree with the student.​

In the circuit shown below, with each bulb holding a resistance of 60 ohms, how many amps of current are flowing? express your number as a decimal.

Which magnetic property best describes a magnet’s ability to act at a distance? magnets are dipolar. magnets attract only certain objects. magnets have magnetic fields. magnets can transfer their properties to certain materials.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)