Explanation

A compound machine is a machine that is made up of two or more simple machines.

A bicycle, a crane, wheel borrow and scissors are examples of compound machines because they are made up of multiple simple machines, such as:

• Wheels and axles (simple machine: wheel)
• Pedals and levers (simple machine: lever)
• Gears and pulleys (simple machine: pulley)
• Inclined planes (simple machine: inclined plane)

Explanation

In a simple model, the unforced rising of hot air can be attributed to the low specific heat of air.

Explanation

The Carnot cycle is best represented on a Pressure-Volume (P-V) graph.

It consists of two isothermal and two adiabatic processes, clearly shown in the P-V diagram.

Explanation

The direction of the magnetic field around most objects or magnets is from the north pole to the south pole.

Explanation

The power factor for a pure capacitive circuit is 0.

Explanation

SCR (Silicon Controlled Rectifier) is a four-layer device.

It consists of four layers of semiconductor material arranged as alternately P-type and N-type layers.

Explanation

• The Sun has a temperature of around 6,000 °C and glows orange/yellow.
• This color is due to the blackbody radiation emitted by the Sun at this temperature, which peaks in the visible spectrum around yellow.

Explanation

Electrons are accelerated by voltages up to 10^9 V in order to find the internal structure of a nucleus.

Explanation

The rates of loss of heat are in the ratio of the squares of their radii: r^2 1 /r^2 2.

Explanation

Transverse waves oscillate perpendicular to the direction of the wave's travel and can exhibit polarization.