Yes, There are solar car challenges.
A solar engine for a solar car is actually an electric motor. Solar cells on a solar car collect solar energy, which is then sent to a battery or battery pack in the form of DC current. This energy is then used to power the solar car.
yes
like a solar power car
A steering mechanism of a car
A Power Monkey is a portable power and solar charger. It is used to quickly charge devices when one is on the road either in a car, on vacation or staying in hotels.
With a battery or solar power!
no
yes
yes there are some solar cars like SunSwift solar car eVe, which holds an FIA world record and in 2015 will be Australia's first road legal solar car
A solar car relies on PV cells (photovoltaic cells) that convert sunlight directly into electricity. The electricity is stored in batteries. The batteries are then used to power electric motorsthat turn the car's wheels.- Visharad Jalan
The car will need whatever power it needs, wherever that power is coming from. A more sensible question would be how big area of solar cells and/or how many hours of sunlight a car would use up.