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3 years ago

If an object has zero resultant force on it, can it be moving? Can it be accelerating?

Physics

1 answer:

hichkok12 [17]3 years ago

5 0

It's moving, in a straight line and at a constant speed. It can't be accelerating.

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A 50.0 kg crate is being pulled along a horizontal, smooth surface. The pulling force is 10.0 N and is directed 20.0 degree abov

allsm [11]

Explanation:

It is given that,

Mass of the crate, m = 50 kg

Force acting on the crate, F = 10 N

Angle with horizontal, $\theta=20^{\circ}$

Let N is the normal force acting on the crate. Using the free body diagram of the crate. It is clear that,

$N=mg-F\ sin\theta$

$N=50\times 9.8-10\ sin(20)$

N = 486.57 N

N = 487 N

If a is the acceleration of the crate. The horizontal component of force is balanced by the applied forces as :

$ma=F\ cos\theta$

$a=\dfrac{F\ cos\theta}{m}$

$a=\dfrac{10\times \ cos(20)}{50}$

$a=0.1879\ m/s^2$

$a=0.188\ m/s^2$

So, the normal force the crate and the magnitude of the acceleration of the crate is 487 N and $0.188\ m/s^2$ respectively.

4 0

3 years ago

In a Little League baseball game, the 145 g ball reaches the batter with a speed of 15.0 m/s. The batter hits the ball, and it l

Oduvanchick [21]

Answer: 5.075Ns

Explanation:

Given the following :

Mass of ball = 145g

Initial Speed of ball = 15m/s

Final speed of ball when hit by the batter = - 20m/s ( Opposite direction)

The impulse of a body is represented using the relation:

Force(f) * time(t) = mass (m) * (final Velocity(V) - initial velocity(u))

Therefore, using:

m(v - u) = impulse

Mass of ball = 145 / 1000 = 0.145kg

Impulse = 0.145(- 20 - 15)

Impulse = 0.145(-35)

Impulse = 5.075Ns

3 0

3 years ago

Pedro está realizando sus tareas de Física. Durante un descanso observa la goma de borrar y el lápiz sobre la mesa, y se pregunt

ahrayia [7]

Answer:

The gravitational force between these two objects is around $F_{g}=6.674*10^{-11} N$

Explanation:

The gravitational force can be written as:

$F_{g}=G\frac{m_{1}m_{2}}{r^{2}}$

Here:

G is the gravitational constant $G = 6.674*10^{-11} m^{3}kg^{-1}s^{-2}$
m(1) is the first mass
m(2) is the second mass
r is the distance between two bodies.

If we see, the gravitational constant is a very small number, therefore the gravitational force is representative just when we have to massive bodies. Let's suppose that the mass of the pencil is 0.1 kg and the eraser is 0.1 kg too, the distance between them would be around 10 cm or 0.1 m, for instance.

Now let's calculate the gravitational force of these two bodies.

$F_{g}=G\frac{0.01*0.01}{0.1^{2}}$

$F_{g}=6.674*10^{-11} N$

As we see it is very small force, so it is negligible relation to the earth gravitational force. That is why these two objects do not move towards each other.

I hope it helps you!

3 0

4 years ago

The energy needed to change an amount of a substance from a solid to a liquid is the

Korvikt [17]

Answer:

Heat or thermal energy!!!

Explanation: When heat is added the particles speed up at rapid rates causing the state of the object to change nd in order to melt it must be heated.

3 0

4 years ago

two identical steel balls mounted on wooden posts initially have different amounts of charge, one with -14uC and the other with

GrogVix [38]

According to the Law of Conservation of Charge, the net charge remains constant. If both things have different charges, upon contact, they would share the charge equally. In this case, the total charge is -16μC. The final charge for each ball would be -8 μC.

7 0

4 years ago

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