When a ball is thrown vertically upward, its velocity goes on decreasing. What happens to it

Gravity on the moon is about 1/6 th the gravity felt on the earth. This is because A) the moon is so far away from the earth. B)

ankoles [38]

<span>So we want to know why is there a difference between the force of gravity on the Moon and the force of gravity of the Earth. So the gravitational force between two objects depends on the masses of both objects. That can be seen from Newtons universal law of gravity. F=G*m1*m2*(1/r^2). So lets say we are holding an object of mass m=1kg on a height r=1m on the Moon and we are holding the same object on the Earth also on the same height of r=1m. The Gravitational force on the Earth will be Fg=G*M*m*(r^2) where M is the mass of the Earth. The force between the moon and that object will be Fg=G*n*m*(r^2), where n is the mass of the moon. Since mass of the Moon is much smaller than mass of the Earth, The gravitational force between the Moon and that body will be almost 6 times smaller than the gravitational force between the Earth and that body. So the correct answer is B. </span>

4 0

2 years ago

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Can i eat air? im hungry

Lerok [7]

Answer:

Yes

Explanation:

8 0

2 years ago

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Describe what happens to pressure as the force exerted on a given area increases.

Goryan [66]

That's the definition of pressure ... force on a given area.

So when that force increases, it's an increase in pressure.

4 0

2 years ago

A small block of mass m1 = 0.4 kg is placed on a long slab of mass m2 = 2.8 kg. Initially, the slab is stationary and the block

mel-nik [20]

Answer:

v₁ = 0.375 m / s , x = 0.335 m

Explanation:

Let's analyze this interesting exercise, the block moves and has a friction force with the tile, we assume that the speed of the block is constant, so the friction force opposes the block movement. For the only force that acts (action and reaction) this friction force exerted by the block that is in the direction of movement of the tile.

We can also see that the isolated system formed by the block and the tile will reach a stable speed where friction cannot give the system more energy, this speed can be found by treating the system with the conservation of linear momentum.

initial moment. Right at the start of the movement

p₀ = m v₀ + 0

final moment. Just when it comes to equilibrium

$p_{f}$ = (m + M) v₁

how the forces are internal

p₀ =p_{f}

m v₀ = (m + M) v₁

v₁ = m /m+M v₀

let's calculate

v₁ = 0.4 /(0.4 + 2.8) 3

v₁ = 0.375 m / s

Let's apply Newton's second law to the Block, to find the friction force

Y axis

N - W = 0

N = W

N = m g

where m is the mass of the block

the friction force has the formula

fr = μ N

fr = μ m g

We apply Newton's second law to slab

X axis

fr = M a

where M is the mass of the slab

μ m g = M a

a = μ g m / M

let's calculate

a = 0.15 9.8 0.4 / 2.8

a = 0.21 m / s²

With kinematics we can find the position

v²= v₀²+2 a x

as the slab is initially at rest, its initial velocity is zero

v² = 2 a x

x = v2 / 2a

let's calculate

x = 0.375²/2 0.21

x = 0.335 m

4 0

2 years ago

1.A student attaches a string to a puck on a frictionless air table, and pulls with a constant force on the puck. a. Draw the fo

Mrrafil [7]

a)

for the puck :

F = force applied in the direction of pull

N = normal force on the puck in upward direction by the surface of table

W = weight of the puck in down direction due to force of gravity

b)

along the vertical direction , normal force balance the weight of the puck , hence the net force is same as the force of pull F .

so F = ma where m = mass of puck , a = acceleration

Fnet = F

c)

since the net force acts in the direction of force of pull F , hence the puck accelerates in the same direction .

6 0

2 years ago