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shepuryov [24]
4 years ago
5

A system consists of three particles with these masses and velocities: mass 3.00 kg, moving north at 3.00 m/s; mass 4.00 kg, mov

ing south at 3.70 m/s; and mass 7.00 kg, moving north at 2.00 m/s. What is the total momentum of the system? Take north as the positive axis. Enter a positive answer if the total momentum is due north and a negative answer if the total momentum is due south.
Physics
1 answer:
lions [1.4K]4 years ago
7 0

Answer:

the total momentum is 8 .2 kg m/s in north direction.

Explanation:

given,

mass(m₁) 3.00 kg, moving north at v₁ = 3.00 m/s

mass(m₂) 4.00 kg, moving south at v₂ =  3.70 m/s

mass(m₃) 7.00 kg, moving north at v₃ = 2.00 m/s

north as the positive axis

south as the negative axis

now

total momentum = m₁v₁ + m₂ v₂ + m₃ v₃

total momentum = 3 x 3 - 4 x 3.7 + 7 x 2

                           = 9 - 14.8 + 14

                           = 8 .2 kg m/s

hence, the total momentum is 8 .2 kg m/s in north direction.

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The amount of energy necessary to remove an electron from an atom is a quantity called the ionization energy, Ei. This energy ca
larisa86 [58]

Answer:

The value is E_i  =  1.5596 *10^{-18} \  J

Explanation:

From the question we are told that

The wavelength is \lambda  =  48.2 nm  =  48.2  *10^{- 9 }\  m

The velocity is v = 2.371*10^6 \ m/s

The mass of electron is m_e  =  9.109*10^{-31} \  kg

Generally the energy of the incident light is mathematically represented as

E =  \frac{h *  c}{\lambda}

Here c is the speed of light with value c =  3.0 *10^{8} \  m/s

h is the Planck constant with value h = 6.62607015 *  10^{-34 }  J\cdot s

So

E =  \frac{6.62607015 *  10^{-34 }* 3.0 *10^{8}}{48.2  *10^{- 9 }}

=> E = 4.12 *10^{-18} \  J

Generally the kinetic energy is mathematically represented as

E_k  =  \frac{1}{2} *  m_e * v^2

=> E_k  =  \frac{1}{2} *  9.109*10^{-31} * (2.371*10^6 )^2

=> E_k  =  2.56 *0^{-18} \  J

Generally the ionization energy is mathematically represented as

E_i  =  4.12 *10^{-18} -   2.56 *0^{-18}

=>     E_i  =  1.5596 *10^{-18} \  J

8 0
4 years ago
Which of the following is an example of transmission of light? A. Light passes through a glass of water. B. A visor blocks sunli
snow_tiger [21]

Hey!


Transmission light is the passage of light through a medium. Hence, the right answer must be option A.


Hope this helps :)

5 0
4 years ago
Read 2 more answers
Before hanging new William Morris wallpaper in her bedroom, Brenda sanded the walls lightly to smooth out some irregularities on
Allushta [10]

To solve the exercise it is necessary to apply the equations necessary to apply Newton's second law and the concept related to frictional force.

An angle of 30 degrees is formed on the vertical at an applied force of 2.3N

In this way the frictional force, opposite to the movement will be given by

f_k = \mu_k N

where,

\mu_k = Kinetic friction constant

N = Normal Force (Mass*gravity)

The friction force is completely vertical and opposes the rising force of 2.3 N. The Normal force acts perpendicular to the surface (vertical) therefore corresponds to the horizontal component of the applied force.

The ascending force would be given by

F_v = 2.3N*Cos30 = 1.99N

As the block is moving upward, the friction force acts downward, also its weight acts downward. We can have

2.3N+f_k = 1.99N

f_k = 0.31N

Considering the horizontal force the normal force on the block must be balanced by the horizontal component of pishing foce

N = 2.3sin30

N = 1.15N

Then the frictional force

f_k = \mu_k N

0.31N = \mu_k 1.15

\mu_k = \frac{0.31}{1.15}

\mu_k =0.26

Therefore the coefficient of kinetic friction is 0.26

3 0
3 years ago
A steel BB of mass m is shot from an air rifle, strikes horizontally with speed v an initially stationary steel block of mass M,
Elden [556K]

Answer:

1. Momentum is conserved in the collision.  

Explanation:

1. Which statement best describes this collision as compared to other types collision?

a. The colliding bodies do not stick together

b. Kinetic energy is conserved in the collision

c. Momentum is conserved in the collision.  True

d. None of the statements describe the collision.

e. The colliding bodies stick together.

The questions 2, 3 and 4 are not completed.

5 0
3 years ago
A mover pushes a 255 kg piano
Allisa [31]

Answer:

0.495ms^{-2

Explanation:

According to the newton's second law of motion we can apply F=ma hear

Force = mass * acceleration

(assume the piano is moving left side )

←F = ma

F(pull) + F (push) = M * a\\77.5 + 48.7 = 255*a\\a = 0.495ms^{-2}

6 0
3 years ago
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