Answer:
I would say the net force acting on the car is in the opposite direction of the car's motion is correct
Answer:
the power of the gravitational force depends on the factors
mass and the distance
Explanation:
A gravitational field is the field generated by a massive body, that extends into the entire space. Every object with mass m experiences a force F when immersed in a gravitational field. The intensity of the force is equal to

where

is the gravitational constant, M is the mass of the source of the field (e.g. the mass of a planet), and r is the distance between the object and the source of the field. The force is always attractive.
A possible way to measure the intensity of a gravitational field is by measuring the acceleration a of the object immersed in this field. In fact, for Newton's second law we have:

but since

we can write

Therefore, by measuring the acceleration of the object, we also measure the intensity of the field.
There are two ways to solve this problem. First we write the given.
Given: Force F = 400 N; Height h = 0.5 m; Time t = 2 s
Formula: P = W/t; but Work W = Force x distance or W = f x d
Weight is also a Force, therefore: W = mg, solve for Mass m = ?
m = w/g m = 400 N/9.8 m/s² m = 40.82 Kg
P = W/t = F x d/t = mgh/t P = (40.82 Kg)(9.8 m/s²)/2 s
P = 100 J/s or 100 Watts
Answer:
The radius is (0.04m) meters
Explanation:
F = mv^2/r
m is the mass of the helicopter = m kg
v is the speed of the helicopter = 20 m/s
F is force supplied by the jet = 10,000 N
10,000 = m×20^2/r
r = 400m/10,000 = 0.04m
The radius is (0.04m) meters