Physics, 11.10.2019 22:00 kaylaelaine18

Enter a one- or two-word answer that correctly completes the following statement.
if the constant force is applied for a fixed interval of time (t), then the of the particle will increase by an amount (at)
if the constant force is applied over a given distance d, along the path of the particle, then the of the particle will increase by fd .
if the initial kinetic energy of the particle is ki , and its final kinetic energy is kf, express kf in terms of ki and the work w done on the particle. find kf

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Answer from: zanaplen27

1. momentum

2. energy

3. Kf = Ki + W

Explanation:

1. If the constant force is applied for a fixed interval of time (t), then the momentum of the particle will increase by an amount (at).

Force F applied for a time t is called impulse and is given as F*t which is equal to the increase or decrease in momentum of an object.

2. If the constant force is applied over a given distance D, along the path of the particle, then the kinetic energy of the particle will increase by FD.

Work-Energy principle:

The principle of work and kinetic energy states that the work done by all forces acting on a particle (the work of the resultant force) equals the change in the kinetic energy of the particle.

3. Kf in terms of Ki and Work done:

We have Ki as the initial Kinetic energy of a particle. The Kinetic energy of a body changes when some work is done on it.

Work done on the particle is given as

Work done = Force * distance

W = F.D

So, final Kinetic energy = Initial Kinetic energy + Work done

Kf = Ki + FD

Answer from: alailatrenee18541

1) Velocity

2) Kinetic Energy

3) K_f = K_i + W

Explanation:

When constant force is applied for a fixed interval of time then we have

F = ma

$a = \frac{F}{m}$

now if the force is constant then we can use kinematics

so we will have

v = v_i + at

v - v_i = at

so here the velocity is increased by factor of "at"

Now the constant force is applied for some given distance D

so here we have work done by the force is given as

W = FD

now by work energy theorem we can say that the total work done by all the forces must be equal to the change in kinetic energy

K_f - K_i = FD

As per above work energy theorem we know that

K_f = K_i + W

Answer from: Quest

Ithink the answer would be a

Answer from: Quest

5.5 n====== $\sum f = ma$ assuming that $\sum f = f_{app}$ we have m = 0.145 kg a = 38 m/s²therefore $f_{app} = (0.145\text{ kg})(38\text{ m/s}^2) = 5.51\text{ n}$ 5.51 n, but two significant figures.final answer: 5.5 n

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