# When a bullet is fired from a gun, what is true about the momentum? The gun has more momentum than the bullet, so the momentum is not conserved. The bullet and gun have equal momenta in opposite directions, so the system's momentum is conserved. The bullet has more momentum than the gun, so the momentum is not conserved. The bullet and the gun have equal momenta in the same direction, so the system's momentum is conserved.

## Related Questions

Shearing

The stress force that causes a mass of rock to pull or twist in opposite directions is called shearing.

Hope this helps! :)

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Force times Mass equals Acceleration.

**The answer is TRUE.**

If the mass increases the number on the left side of the equation increases, thus increasing the right side as well.

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Answer: **DC flows in one direction, and AC repeatedly switches direction**

Explanation:

DC stands for direct current.

AC stands for alternating current.

**When current flows only in single direction, it is known as direct current. When current changes direction i.e. it alternates direction, it is known as alternating current.**

There are both AC generators and DC generators.

AC generators supply power to home appliances and small motors. DC generators are used to power large electric motors.

The electromagnetic spectrum contains visible light along with many other components such as radio waves, microwaves, ultraviolet rays and gamma rays.

Both processes release tremendous amounts of energy.

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Before answering this question, first we have to understand the effect of ratio of surface area to volume on the rate of diffusion.

The rate of diffusion for a body having larger surface area as compared to the ratio of surface area to volume will be more than a body having less surface area. Mathematically it can written as-

V∝ R [ where v is the rate of diffusion and r is the ratio of surface area to volume]

As per the question,the ratio of surface area to volume for a sphere is given

The surface area to volume ratio for right circular cylinder is given

Hence, it is obvious that the ratio is more for right circular cylinder.As the rate diffusion is directly proportional to the surface area to volume ratio,hence rate of diffusion will be more for right circular cylinder.

Hence the correct option is **B. The rate of diffusion would be faster for the right cylinder.**

**These are 3 questions and 3 answers**.

**Question 1. **

**Answer: I = 0.01 A**

**Explanation:**

**a) Data:**

i) Type of circuit: series

ii) R₁ = 100 Ω

ii) R₂ = 100 Ω

iii) V = 2 V

iv) I = ?

**b) Formulas**

i) Equivalent resistance, R = R₁ + R₂

ii) Ohm's law, V = IR

**c) Solution**

i) R = 100Ω + 100Ω = 200Ω

ii) I = V / R = 2 V / 200Ω = 0.01 A

**Question 2) **

**Answer: False. **

**Explanation: **

The nuclear model of the atom states that the atom is neutral, and consists of a **nucleus**, which holds the **protons** and the **neutrons, **and the** electrons **which are around the nucleous (in regions called orbintals).

The electrons are negatively charged and the protons are positively charged.

The magnitudes of the charges of both electrons and protons are equal.

Therefore, for the atom be neutral, **the neutrons cannot have charge.**

**Question 3.**

**Answer: oppose (or resist).**

**Explanation:**

1) The most basic electrical circuit consists of a 1) potential difference (voltage) source, which gives the "impulse" to the charge to flow, 2) the wire, which is the medium through which the charge flows), and 3) **a resistor.**

**The resistor is the element with "resistance" to the flow of charge, this is it resists or oppose the flow of charge.**

Some components, like motors, filaments, buzzers, which content or are resistors per se, transform the current (flow of charge) in other useful forms of energy (motion, light, heat, sound).

The resistor meets Ohm's law which states R = V / I, at constant temperature.

A barometer is used to measure air pressure. true or false.

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Work is equal to _____. force times size velocity times force distance times force

**Answer : The correct option is, distance times force**

**Explanation :**

**Work **: It is defined as the force acting on an object to cause a displacement. Or we can defined as the work is equal to the product of the force of an object and displacement of an object.

**The formula of the work is written as,**

where,

W = work done

F = force applied on an object

d = displacement of an object

**Hence, the work is equal to distance times force.**

But if he passed high school physics, then he may remember that

'work' in physics means (force) x (distance). If there's no distance,

then there's no work.

He realizes that he isn’t doing any work because he's not moving the weight.

By definition, the mechanical advantage is the relationship that exists between the output force or load lifted and the value of the force applied.

Thus, using the definition, we have that the mechanical advantage is given by:

Therefore, the mechanical advantage of lifting the box by using a pulley is equal to 1.

**Answer:
**

**The mechanical advantage in this situation is:
**

**Equal to 1**

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What it means to say that energy is conserved as a ball fall towards ground

if there is no friction, M.E. is conserved

as a ball falls, it is losing height. (P.E.=mgh , therefore P.E. will decrease)

the potential energy is transformed into kinetic energy which equals 1/2MV^2.

the increase in K.E. equals the decrease in P.E.

and the sum of both equals M.E.

thus mechanical energy is conserved.

hope this helps you.

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Answer: It increases the time it takes for the person to stop.

Explanation:

From Newton's second law of motion, we know that the **force is equal to rate of change of momentum. **

In a car, during collision when the air bag pops out, **it increases the time it takes to stop** the person thereby** decreasing the rate of change of momentum**. Hence, the force acting on the person minimizes.

**Answer:**

The basic unit of matter is the electron.

**Explanation:**

Electrons have a negative charge.

Above statement is true because electron is a negatively charged particle and its charge is given as e = .

The orbit of electrons around the nucleus is like a cloud.

Above statement is true as electron forms a cloud around the nucleus and that cloud is known as orbit of electron.

The path an electron moves on is not very straight.

Above statement is true as Electron moves around the nucleus in closed loop and in this path centripetal force is given by electrostatic attraction force

The basic unit of matter is the electron.

Above statement is not correct as we know that basic unit of matter is not electron but it consist of electron, neutron and proton

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Lava blown out of a volcano in explosive eruption is called pumice. True False

The answer is false, pumice is a rock formed from the smoggy powder that shoots out of a volcano called pumicite.

Some animals can replace lost parts by growing new ones? true or false

**True**, unlike human beings, plants, protists -- unicellular organisms such as bacteria, algae, and fungi and many invertebrate animals such as earthworms and starfish. These organisms can grow new heads, tails, and other body parts when injured.

Hope this helps. :)

Se um veiculo passa sua velocidade de 2m/s para 12 m/s em 2 segundos

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**The correct answer of this question is : D) The initial momentum is 5 kg m/s, and the final momentum is 10 kg m/s**

EXPLANATION :

Before going to answer this question, first we have to understand the momentum.

**The momentum of a body is the amount of motion contained in a body. Quantitatively momentum is the product of mass with velocity.**

**Mathematically momentum p = mv.**

Here, m is the mass of the body, and v is the velocity of the body.

As per the question, the mass of the ball m = 5 Kg.

The initial velocity of the ball u = 1 m/s.

**Hence, initial momentum = m × u**

= 5 Kg × 1 m/s

** = 5 Kg.m/s**

The final velocity of the ball v = 2 m/s

**Hence, final momentum p = m × v**

= 5 Kg × 2 m/s

** = 10 Kg.m/s ** [ans]

The angular momentum quantum number determine the energy of the electron on the outer shell, the possible number of electrons on particular orbital, the shape of the orbital and the orientation of the orbital. Therefore the answer is orbital orientation.

The freezing and melting temperatures of a substance are the same.

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**Answer: **The correct answer is "The freezing and melting temperatures of a substance are the same".

**Explanation:**

**Freezing temperature: **It is the temperature at which the liquid becomes the solid.

**Melting temperature:** It is the temperature at which the solid starts converted into liquid.

**The freezing point of a substance is the same as the melting point of the substance. During melting and freezing of the substance, the temperature remains same as the energy is spent in changing the phase of the substance not in changing the temperature.**

Latent heat is there. It is a hidden heat. It is required to change phase of the substance without showing temperature on thermometer.

**Boiling temperature:** It is the temperature at which liquid gets converted into vapors. At this temperature, vapor pressure of the liquid equals to the pressure surrounding the liquid.

If mv is the momentum of apple at angle θ to the x axis,

In the x direction

0.130*v cos θ = (0.170*1.23) -(0.130*1.08)

0.130*v cos θ = 0.0687-------------------------2

In the y direction

0.130*v sin θ = (0.170*0.974) = 0.16558--------------1

From 1 and 2

tan θ = 2.41

θ = 74.96º

Substituting the value of θ in

0.130*v cos θ = 0.0687

v = 1.38 m/s

======================

A) to find time to travel the 300m,

just find horizontal component of the velocity and divide.

ie x=89 x t x cos 40, t=x/89 x cos 40

B) y=vtsin 40 - gt^2/2, just sub in

I believe you can do the rest.

I hope I helped you with my answers.

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