Answer:
The mass of the objects
Distance between the objects
Explanation:
The two factors that determines the amount of gravitational force between two objects is the mass of the objects and the distance between them.
Gravitational force of attraction is directly proportional to the product of the masses of the two objects and inversely proportional to the square of the distance between them. This is the postulate of the newton's law of universal gravitation.
Mathematically:
F = 
m is the mass
r is the distance
G is the universal gravitation constant
Answer:
Negative acceleration
Explanation:
Let us assume a vehicle is moving with a constant velocity u and then it comes to a sudden stop.
The initial velocity of the vehicle is u and finally it comes to rest, it means final velocity is 0.
As we know that,
Acceleration is equal to change in velocity divided by time taken.
We can see that the value of acceleration is negative. Hence, it leads to negative acceleration.
Answer:
2.1 m/s²
Explanation:
By definition, the angular acceleration, is equal to the rate of change of the angular velocity, ω:
α = Δω / Δt (1)
By definition of the angular velocity, we can express the linear velocity, v, as follows:
v = ω*r⇒ Δv = Δω*r (2)
Replacing Δω, from (1) in (2), we get:
Δv = α*Δt*r⇒ Δv/Δt = α*r (3)
By definition of linear acceleration, we can write the following expression;
a = α*r
For a point on the edge of the wheel, the linear acceleration is tangent to the rim, and is equal to the product of the angular acceleration times the distance to the center, which for a point on the edge of the wheel, is just the radius:
⇒ a = 7 rad/sec²*0.3m = 2.1 m/s²
