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musickatia [10]
3 years ago
9

A fancart of mass 0.8 kg initially has a velocity of < 0.8, 0, 0 > m/s. Then the fan is turned on, and the air exerts a co

nstant force of < −0.3, 0, 0 > N on the cart for 1.5 seconds. What is the change in momentum of the fancart over this 1.5 second interval?
Physics
1 answer:
Anna71 [15]3 years ago
6 0

To solve this problem we will apply the concepts related to the change of the momentum. At the same time we will use Newton's second law to obtain the acceleration of the object and the kinematic equations of linear motion.

Newton's second law is defined as,

F = ma \rightarrow a = \frac{F}{m}

Here,

F = Force

m = Mass

a = Acceleration

Our values are given as,

v_i = 0.8 m/s

v_f = ?

t = 1.5s

F = -0.3N

According to this values we have that the acceleration is,

a = \frac{F}{m}

a = \frac{-0.3}{0.8}

a = -0.375m/s^2

Now applying the concepts of kinematic equations we have that the final velocity is,

v_f = v_i + at

v_f = 0.8m/s + (-0.375m/s^2)(1.5s)

v_f = 0.3375m/s

By definition we know that momentum is the product between mass and velocity, so the change in momentum would be given by

\Delta p = p_f - p_i

\Delta p = mv_f-mv_i

\Delta p = m(v_f-v_i)

\Delta p = (0.8)(0.3375-0.9)

\Delta p = - 0.45kg \cdot m/s

Therefore the change in momentum of the fancart is -0.45kg m/s

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NEED ANSWER ASAP!!! Angela has a bucket of mass 2 kg tied to a string. She places a drinking glass of mass 0.5 kg in the bucket.
Schach [20]

a. The free-body diagram for the glass when it is at the top of the circle is attached below.

b. The equation for the net force on the glass at the top of the circle in terms of w, Fn, m, v, and r is mg x g + N -  mg x Vtop² /R =0

c. The glass will fall out of the bucket if the normal force between the glass and bucket equals zero. The speed with which she spin the bucket to prevent this from happening is 3.83 m/s.

d. The string will break if the tension on it is more than 100 N. The range of speeds can  prevent the string from breaking is 3.83< Vtop<4.99 m/s

<h3>What is Net force?</h3>

When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.

Given, Angela has a bucket of mass 2 kg tied to a string. She places a drinking glass of mass 0.5 kg in the bucket. She spins the bucket in a vertical circle of radius 1.5 m. She must swing the bucket to keep the glass from falling out.

a. The free body diagram of the bucket and glass is attached below.

b. Bucket will undergo centrifugal force

Fb = mVtop² /R

From the equilibrium of forces, we have

For bucket,

T +mb xg - N =  mb x Vtop² /R..............(1)

For glass,

mg x g + N =  mg x Vtop² /R..............(2)

Thus, this is the net force equation on the glass.

c. On adding both the equations. we have

T + (mb + mg) xg = (mb + mg) Vtop² /R

Substituting the values, T = 0 and from the question, we get

0 + (2+0.5) 9.81 = (2+0.5)(Vtop²/0.5)

Vtop = 3.83 m/s

Thus, the speed of spin to prevent glass from falling out is 3.83 m/s

d. The string will break if the tension on it is more than 100 N

100 + (2+0.5) 9.81 = (2+0.5)(Vtop²/0.5)

Vtop = 4.99 m/s

Thus, the range of velocity is  3.83< Vtop<4.99 m/s

Learn more about net force.

brainly.com/question/18031889

#SPJ1

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2 years ago
Which one A or B Help Fast Now
irga5000 [103]

Answer:

the answer is b because it does not show evidence

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dmitriy555 [2]

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2.The process releases energy because the total mass of the resulting single nucleus is less than the mass of the two original nuclei.

3.In nuclear reactions, mass is never conserved—some mass is exchanged for energy and energy for mass. Nuclear reactions take place in an atom's nucleus. In a spontaneous nuclear reaction, such as radioactive decay, mass is "lost" and appears as energy in the form of particles or gamma rays.

4.In a nuclear reaction, mass decreases and energy increases. The sum of mass and energy is always conserved in a nuclear reaction.

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Explanation:

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