Some planets rotate faster or than others.
Also the planets take different times to orbit the Sun.
Because of the difference in speed of rotation of each planet.
False, the speed it spins on it's axis determinds the length of day. The speed it rotates the sun determinds the length of it's year.
the tilt of the planet
In general terms a day for a planet is the time taken for the planet to make on rotation on its own axis. Likewise a year for a planet is the time taken for the planet to make one orbit (rotation round) its primary star. Where a planet is tidally locked to its primary, the day length and the year length will be the same, such that the planet keeps one face permanently towards it primary (like the Moon does to the Earth).
That depends where you are on the planet. the length of day is shorter the further away from the equator you are.
Venus. The "day" (rotation period or sidereal day) is longer than the year! Venus Sidereal day: 243 Earth days. Venus Year: 224.7 Earth days.
Because different planets have different diameters and spin at different rates.
Mars.
Mars
The planet Mercury has a day that is almost the same length as its year. Mercury's rotation period is about 59 Earth days, which is very close to its orbital period around the Sun of about 88 Earth days. This means that one day on Mercury is almost as long as one year on Mercury.
No
No because a day is how long it spins on it's axis not around the sun. But it kinda has a relationship to how long a year is on a planet. Because the farther away it is the bigger it's revolution around the sun is but it just depends on how fast it moves.