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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.


The correct answer is B.

Related Questions

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

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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Will upvote!! True or False- The parts of a mixture keep their own properties when they are combined.

I believe the correct answer is false. The parts of a mixture do not keep their own properties when they are combined. When they are combined, they exhibit or behave with different properties since each atom is bonded which gives them unique properties. Hope this helps.

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If you increase the force on an item without changing the mass you increase acceleration? true or false?

(F)(M)=A
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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If two carts collide, what type of collision will conserve both momentum and kinetic energy? a. head on b. perfectly inelastic c. none d. perfectly elastic

The appropriate answer is d. perfectly elastic. When a perfectly elastic collision occurs both momentum and kinetic energy are preserved. Momentum is the mass of an object times its velocity while kinetic energy is the energy that a moving object has due to its motion. In an elastic collision kinetic energy would be converted to some other form of energy. 

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Which best compares AC and DC? AC flows in one direction, and DC repeatedly switches direction. DC flows in one direction, and AC repeatedly switches direction AC is used only in generators, and DC is used only in motors DC is used only in generators, and AC is used only in motors

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.

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Consider the following geometric solids. A sphere with a ratio of surface area to volume equal to 0.08 m-1. A right circular cylinder with a ratio of surface area to volume equal to 2.1 m-1. What results would you expect if these two models were compared in a diffusion test? A. The rate of diffusion would be the same for the two models. B. The rate of diffusion would be faster for the right cylinder. C. The rate of diffusion would be slower for the right cylinder. D. The rate of diffusion would be faster for the sphere.

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 0.08m^{-1}

The surface area to volume ratio for right circular cylinder is given 2.1m^{-1}

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.


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1. In the circuit shown below, with each bulb holding a resistance of 100 ohms, how many amps of current are flowing? Express your number as a decimal. (See Figure) 2. Protons have positive charge, neutrons have negative charge, and electrons have no charge. A. True B. False 3. A complete electric circuit includes a voltage source, current, wires, and something to _________ the flow of current.

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.

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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,

W=F\times d

where,

W = work done

F = force applied on an object

d = displacement of an object

Hence, the work is equal to distance times force.

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Victoria has a crate of vegetables that weighs 100 newtons she exerts a force of 100 Newtons to lift the crate with a pulley what's the mechanical advantage in this situation. Less than 1 Equal to 1 Equal to 0 More than 1

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:

 MA = \frac{100}{100}\\MA = 1

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 is the force on a 1000 kilogram elevator that is falling freely under acceleration of gravity only? If the formula is force equals mass times acceleration

If Earth's gravitational pull is 9.8 meters per second, and the elevator's mass is 1000 kilograms, then the force of the elevator is 9,800.

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

Mechanical energy = Potential Energy + Kinetic Energy

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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In a car, how does an air bag minimize the force acting on a person during a collision? It increases the change in momentum of the person. It decreases the change in momentum of the person. It increases the time it takes for the person to stop. It decreases the time it takes for the person to stop.

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.

F = \frac{dp}{dt}

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.

Posted in Physics

Which statement is not true about electrons? Electrons have a negative charge. The orbit of electrons around the nucleus is like a cloud. The path an electron moves on is not very straight. The basic unit of matter is the electron.

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 = -1.6 \times 10^{-19} C.

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.


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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. :)

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A bowling ball has a mass of 5 kg. What happens to its momentum when the speed increases from 1 m/s to 2 m/s? A) The initial momentum is 5 kg m/s and the final momentum is 7 kg m/s B) The initial momentum is 5 kg m/s and the final momentum is 3 kg m/s C) The initial momentum is 5 kg m/s and the final momentum is 20 kg m/s D) The initial momentum is 5 kg m/s and the final momentum is 10 kg m/s

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]


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Which characteristic is given by the angular momentum quantum number? orbital size orbital mass orbital shape orbital orientation

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.

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Which of the following statements is true? -the freezing and boiling temperatures of a substance are the same. -the freezing and condensation temperatures of a substance are the same. -the freezing and melting temperatures of a substance are the same. -the freezing, melting, and boiling temperatures of a substance are the same. Please help!!

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.

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Physics Help Please: Two astronauts on opposite ends of a spaceship are comparing lunches. One has an apple, the other has an orange. They decide to trade. Astronaut 1 tosses the 0.130kg apple toward astronaut 2 with a speed of vi,1 = 1.07m/s . The 0.160kg orange is tossed from astronaut 2 to astronaut 1 with a speed of 1.19m/s . Unfortunately, the fruits collide, sending the orange off with a speed of 0.998m/s in the negative y direction. What are the final speed and direction of the apple in this case? I already found the speed (1.29m/s) but I cannot find the direction. Picture is in the reply box. Thank You

Assume orange is going from left to right and apple is going from right to left 
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 
======================

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A cannon elevated at 40 degrees is fired at a wall 300m away on level ground. The initial speed of the cannonball is 89m/s How long does it take for the ball to hit the wall? At what height does the ball hit the Wall?

For the answer to the question above, we'll have to use these formulas.

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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