If a person weighs 700N on Earth, what force due to gravity would they exert on a 1500kg car they are standing 1.5m from? Assume the distance is between their centres of mass.

F=Gm1xm2/r^2?

you have the numbers and the formula. What's the problem?

All you need is the person's mass: 700/9.8 kg

Yes, you are on the right track! The formula you've mentioned is Newton's law of universal gravitation, which can be used to calculate the force due to gravity between two objects. Here's how you can use it to find the force exerted by the person on the car:

1. Determine the appropriate values:
- The mass of the person (m1) = unknown
- The mass of the car (m2) = 1500 kg
- The distance between the person and the car (r) = 1.5 m
- The gravitational constant (G) = 6.67430 × 10^-11 m^3/(kg * s^2)

2. Rearrange the formula:
Since you want to find the force exerted by the person on the car, you can rearrange the formula as follows:

F = G * (m1 * m2) / r^2

3. Plug in the known values and solve:
Now, you need to plug in the values you know into the formula:

F = (6.67430 × 10^-11 m^3/(kg * s^2)) * (m1 * 1500 kg) / (1.5 m)^2

4. Calculate the force:
Since you don't have the mass of the person (m1), you won't be able to find the exact force exerted. However, you can solve for m1 in terms of F by rearranging the formula:

m1 = (F * r^2) / (G * m2)
m1 = (700 N * (1.5 m)^2) / ((6.67430 × 10^-11 m^3/(kg * s^2)) * 1500 kg)

Now you can plug in the known values to find the approximate mass of the person (m1).