Question

1. venus revolution 19.4 x 10 ^ -6 s and venus distance to the sun: 108 x 10 ^ 6. so, venus speed of around the sun?
2. planet mass 4 x 10 ^ 20 kg and radius 4,000,000 km. so, how the acceleration of gravity at the surface of the planet?
3. revolution a planet 8 years, the distance of the planet to the sun?
4. 1 ton mass of a car, for 4 second speeds up to 18 m / s. great force that accelerates the car is?

Answer 1

help me !

Answer 2

Is the speed you need to find in question 1 the angular speed or just distance/time?

Answer 3

just the speed

Answer 4

Question 1)
Distance = \(2\pi r\), r = distance of Venus from the Sun
Speed = distance / time

Answer 5

the other question ?

Answer 6

Question 2)
\[F = G\frac{Mm}{r^2}\]\[g= \frac{F}{m} = \frac{ G\frac{Mm}{r^2}}{m} = \frac{GM}{r^2}\]G = gravitational constant.

Answer 7

:)

Answer 8

Question 3)
Same formula as question 1. This time, you need to find r.

Answer 9

how about number 4?

Answer 10

Question 4)
F = ma

\[a = \frac{\Delta v}{\Delta t}=\frac{v_1-v_0}{\Delta t}\]

Answer 11

Assume it is frictionless

Answer 12

@Callisto thank you so much for that :)

Answer 13

Welcome..
Make sure you understand what/why I did there.

Answer 14

you're very kind @Callisto

Answer 15

Did you manage to get 3?
3. revolution a planet 8 years, the distance of the planet to the sun?

It's not as simple as @Callisto said. You'll have to equate centripetal force and gravitational force to find r

\[\Large \frac{ m v^2 }{ r }= G \frac{ Mm }{ r^2 }\]and also use this to find v to plug into that formula (T is the period of revolution, in seconds)
\[\Large T=\frac{ 2 \pi r }{ v }\]

Answer 16

You also need the mass of the sun, https://www.google.com/search?q=mass+of+the+sun&oq=mass+of+the+sun&aqs=chrome.0.57j0j5j0j60l2.2639j0&sourceid=chrome&ie=UTF-8