a 20-g bullet moving at 950 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. if the block had been originally at rest and is free to move, what is its resulting speed?

Answer:

1.5 m\s Ans ......

Explanation:

Data:

f = 0.5 Hz

w = 3 m

v = ?

Formula:

v = fw

Solution:

v = (0.5)(3)

v = 1.5 m\ s Ans ........

Answer:

a) v₂ = 4.2 m/s

b) v₂ = 5 m/s

Explanation:

a)

We will use the law of conservation of momentum here:

\(m_1u_1+m_2u_2=m_1v_1+m_2v_2\)

where,

m₁ = m₂ = mass of bowling pin = 1.8 kg

u₁ = speed of first pin before collsion = 5 m/s

u₂ = speed of second pin before collsion = 0 m/s

v₁ = speed of first pin after collsion = 0.8 m/s

v₂ = speed of second after before collsion = ?

Therefore,

\((1.8\ kg)(5\ m/s)+(1.8\ kg)(0\ m/s)=(1.8\ kg)(0.8\ m/s)+(1.8\ kg)(v_2)\\v_2 = 5\ m/s - 0.8\ m/s\)

v₂ = 4.2 m/s

b)

We will use the law of conservation of momentum here:

\(m_1u_1+m_2u_2=m_1v_1+m_2v_2\)

where,

m₁ = m₂ = mass of bowling pin = 1.8 kg

u₁ = speed of first pin before collsion = 5 m/s

u₂ = speed of second pin before collsion = 0 m/s

v₁ = speed of first pin after collsion = 0 m/s

v₂ = speed of second after before collsion = ?

Therefore,

\((1.8\ kg)(5\ m/s)+(1.8\ kg)(0\ m/s)=(1.8\ kg)(0\ m/s)+(1.8\ kg)(v_2)\)

v₂ = 5 m/s

The strength of an electric field that will balance the weight of a proton is 1.6 x 10^-18 N/C.

The strength of an electric field that will balance the weight of a proton is given by the Coulomb force formula which is F=Eq. Therefore, the electric field strength that balances the weight of a proton is given by:

E=qg

where E is the electric field strength, q is the charge of the proton, and g is the acceleration due to gravity.

Electric field strength (E) = qg

From the Coulomb's law, we know that, q = e = 1.60 x 10^-19 C

Also, the weight of the proton (F) is given by:

F = mg

where m is the mass of the proton and g is the acceleration due to gravity.

Therefore, the value of g is 9.81 m/s^2

Therefore,

F = m * g = (1.67 x 10^-27 kg) * (9.81 m/s^2) = 1.64 x 10^-26 N

Therefore, the electric field strength that balances the weight of a proton is:

E=qg = (1.60 x 10^-19 C) * (9.81 m/s^2) = 1.57 x 10^-18 N/C

Approximately, the electric field strength is 1.6 x 10^-18 N/C

Learn more about Electric field:

https://brainly.com/question/14372859

#SPJ11

Answer:

C

Explanation:

Alpha decay

Answer:

75000kg m/s

Explanation:

Momentum = Mass X Velocity

p = mv

3000 X 25 = 75000 kg m/s

Answer:

2 m/s²

Explanation:

If changes speed by 2 meters per second each second means:

2 m/s²

Because it changes constantly it veloctity.

Remember the aceleration changes the velocity.

Answer:

c. 2 m/s2

is the right answer.

Answer:

B,A,A

Explanation:

Answer:

Other guy is correct b,a,a

Explanation:

Answer:

The car drives 108 m

Answer: D. -5

It is -5 because you subtract 13 from 8 to get to the answer.

Answer:

d -5 m

Explanation:

bc 8 subtract by 13 = 5

hm..

Explanation:

this would be quite hard to answer because no one has actually experienced the lab so maybe I can help better if you give more information on the lab you did:)

Answer: To figure the motion of the object or thing and the purpose i to learn off it

Explanation:

for 1.

Answer:

Inside the guts of a microwave, a device called a magnetron channels electrical energy from a power outlet to a heated filament, creating a flow of electrons that in turn transmits microwaves into the cooking chamber through an antenna

Answer:

Microwaves use radiation as the method of heat transfer.

Explanation:

Radiation refers to heat transfer via electromagnetic waves, such as microwaves. Conduction is heat transfer via direct contact between two objects.

Answer:

F = 9 N

Explanation:

We have,

Mass of a ball is 2 kg

The radius of the circle the ball travels around is 2 m

Let the velocity of the ball is 3 m/s

It is required to find the centripetal force on the ball. The force that is required to move an object in circular path is called centripetal force.

\(F=\dfrac{mv^2}{r}\\\\F=\dfrac{2\times (3)^2}{2}\\\\F=9\ N\)

So, the centripetal force on the ball is 9 N.

According to Fleming's left-hand rule, the direction of the force is parallel to the directions of the magnetic field and current.

Here, the current is flowing upward while the magnetic field is to the right (opposite to the flow of electron). When a charge particle moves through the magnetic field, a force known as the magnetic force is exerted on the charge particle. The magnetic force acts perpendicular to the velocity at every time when a charged particle moves perpendicular to a uniform magnetic field, causing the particle to proceed on a circular path with a constant velocity v. As a result, although the direction of the velocity changes, its magnitude does not.

Learn more about magnetic here-

https://brainly.com/question/13026686

#SPJ4

The frequency of a sound wave affects the way our ears perceive sound:

1) A sound wave is created when an object vibrates and causes the molecules in the surrounding medium (such as air or water) to vibrate.

2) The frequency of a sound wave is the number of times that the object vibrates back and forth per second. This frequency is measured in hertz (Hz).

3) When a sound wave reaches our ears, it causes the eardrum to vibrate.

This vibration is then transmitted to the inner ear, where it is detected by hair cells in the cochlea.

4) The cochlea is a fluid-filled structure in the inner ear that contains hair cells that are sensitive to different frequencies of sound.

5) Hair cells in the cochlea that are closest to the entrance of the ear are most sensitive to high-frequency sounds, while hair cells at the other end of the cochlea are most sensitive to low-frequency sounds.

6) When a sound wave enters the ear, it causes the fluid in the cochlea to vibrate.

This vibration causes the hair cells that are sensitive to that frequency to bend.

7) The bending of the hair cells generates an electrical signal that is transmitted to the brain via the auditory nerve.

8) The brain then interprets the electrical signals from the hair cells as sound.

The frequency of the sound wave determines the pitch of the sound that we hear, with higher frequencies being perceived as high-pitched sounds and lower frequencies being perceived as low-pitched sounds.

In summary, the frequency of a sound wave determines which hair cells in the cochlea are activated, which in turn determines the pitch of the sound that we hear.

To know more about frequency of a sound wave :

https://brainly.com/question/14588741

#SPJ11

Answer:

A

Explanation:

Please see the attached picture for the full solution.

Since we are only concerned about the decrease in gravitational potential energy of the car, we look at the decrease in height of the car as it moves from point X to point Y, instead of the distance travelled by the car.

The answer is B. It has a central nucleus composed of 29 protons and 35 neutrons, surrounded by an electron cloud containing 29 electrons.

Given the data from the question, the correct statement is:

An atom is composed of a centrally placed nucleus (containing protons and neutrons) and a cloud of electrons revolving round it.

Mass number = Proton + Neutron

64 = 29 + Neutron

Collect like terms

Neutron = 64 – 29

Neutron = 35

Note

Proton = Electron = 29 (since the atom is neutral)

Thus, we can conclude that the atom has central nucleus composed of 29 protons and 35 neutrons, surrounded by an electron cloud containing 29 electrons  (Option B)

Learn more about composition of atoms:

https://brainly.com/question/886387

The answer is:

An/a inelastic collision

Light has both a wave and a particle nature. Particles have a wave nature as well, and therefore their position can not be specified with absolute precision

This is a consequence of the Heisenberg uncertainty principle enunciated in 1927, after the works of the French physicist Louis De Broglie who proposed the existence of matter waves, that is to say, that all matter has a wave associated with it.

The uncertainty principle postulates that the fact that each particle has a wave associated with it, imposes restrictions on the ability to determine its position and speed at the same time.

It is impossible to measure simultaneously (according to quantum physics), and with absolute precision, the value of the position and the momentum (linear momentum) of a particle.

So, the greater certainty is sought in determining the position of a particle, the less is known about its linear momentum and, therefore, its mass and velocity.

It should be noted that this uncertainty does not derive from the measurement instruments, but from the measurement itself. Because, even with the most precise devices, the uncertainty in the measurement continues to exist.

Learn more about the Heisenberg uncertainty principle here:

https://brainly.com/question/23884256

#SPJ4

The anticipated time when he will appear again is 5:17 pm

The given parameters;

your speed, \(V_a\) = 3 m/s

the runner's speed, \(V_b\) = 14 m/s

the diameter of the lake, d = 2 miles = 3218.69 meters

The circumference of the lake is calculated as;

\(C = \pi d\\\\C = 3.142 \times 3218.69 = 10,113.12 \ m\)

Apply concept of relative velocity to determine the time, in which he will appear again.

By the time he appears again;

the distance you moved + distance he moved = circumference of the circle

\(V_at + V_bt = 10, 113.12\\\\(V_a + V_b)t = 10,113.12\\\\(3 + 14) t = 10,113.12\\\\17t = 10,113.12\\\\t = \frac{10,113.12}{17} \\\\t = 594.89 \ s = 9.92 \ \min \ \approx 10 \ \min\)

\(t\ \approx \ \ 5:17 \ pm\)

Thus, the anticipated time when he will appear again is 5:17 pm

Learn more here: https://brainly.com/question/20662992

Answer: 46125 kg*m/s West

Explanation:

Momentum = mass*velocity

Momentum = 3750kg * 12.3 m/s

Momentum = 46125 kg*m/s West

That's the flat-top marked ' B '.

It's 6 m/s.

Answer:

A Van Allen radiation belt is a zone of energetic charged particles, most of which originate from the solar wind, that are captured by and held around a planet by that planet's magnetosphere. Earth has two such belts, and sometimes others may be temporarily created

The correct answer is(b). There is a physical change from the solid state to a gas state where energy between the molecules increases.

During sublimation, carbon dioxide transitions directly from the solid state (dry ice) to the gas state without passing through the liquid phase. In this process, individual molecules of carbon dioxide gain energy from the surroundings, leading to an increase in their kinetic energy and molecular movement.

As a result, the carbon dioxide molecules separate from each other and form a gas. This phase change is considered a physical change rather than a chemical change since the chemical composition of carbon dioxide remains the same throughout the process.

Therefore, the sublimation of carbon dioxide results in a physical change where the molecules transition from the solid state to the gas state, gaining energy and increasing their molecular movement.

Learn more about  sublimation

brainly.com/question/15057312

#SPJ11

Answer:

c i think

Explanation:

Answer:

its speed will be less than V

Explanation:

When the ball falls a distance d, its final kinetic energy plus rotational kinetic energy of the drum equals its initial potential energy.

K = U

With its speed V at the end of d, we have

1/2mV² + 1/2Iω² = mgd where I = rotational inertia of drum and balls, ω = angular speed of drum and balls and m = mass of box

1/2mV² + 1/2Iω² = mgd

1/2mV² = mgd - 1/2Iω²

V² = [2(mgd - 1/2Iω²)/m]

V = √[2(mgd - 1/2Iω²)/m]

When the four balls are moved inward closer to the drum, their rotational inertia increases and also its angular speed which thus causes an increase in rotational kinetic energy. But, since the box still falls the same distance of d, its final kinetic energy plus rotational kinetic energy of the drum plus balls still equals its initial potential energy

K = U

I' = new rotational inertia of drum and balls, ω' = new angular speed of drum and balls

With its new speed is now V' at the end of d,

1/2mV'² + 1/2I'ω'² = mgd

1/2mV'² = mgd - 1/2I'ω'²

V² = [2(mgd - 1/2I'ω'²)/m]

V' = √[2(mgd - 1/2I'ω'²)/m]

Since I' and ω' increase, the rotational kinetic energy of the drum and balls (1/2I'ω'²) increases. Thus, the difference (mgd - 1/2I'ω'²) < (mgd - 1/2Iω²) which implies that the kinetic energy of the box decreases. Hence, since its kinetic energy decreases, its speed V' also decreases.

So,  V' < V

So, its speed will be less than V.