1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tamiku [17]
2 years ago
13

A bullet with mass 4.00 g and speed 650.0 m/s is fired at a block of wood with mass 0.0950 kg. The block rests on a "frictionles

s" surface and is thin enough so that the bullet passes completely through it. Immediately after the bullet exits the block, the speed of the block is 23.0 m/s. (a) What is the speed of the bullet after it exits the block? (answer: 104 m/s)
Physics
2 answers:
KonstantinChe [14]2 years ago
7 0

Answer:

The final speed of the bullet after exit = 104 m/s²

Explanation:

Law of conservation of momentum :

The law of conservation of momentum states that in a system of colliding object, the total momentum is conserved, provided there is no net external force acting on the system. I.e

Total momentum before collision = total momentum after collision

m₁u₁ + m₂u₂ = m₁v₁ +m₂v₂............................equation 1

Making v₂ the subject of the equation,

v₂ ={(m₁u₁ + m₂u₂) - m₂v₂}/m₁ .......................equation 2

Where m₁  mass of the bullet, m₂ = mass of the block, u₁ = initial velocity of the bullet, u₂ = initial velocity of the block, v₁ = final velocity of the bullet, v₂ = final velocity of the block.

From the question,

m₁ = 4.00 g = 4/1000 = 0.004 kg, m₂ = 0.0950 kg, u₁ = 650 m/s, u₂ = 0 m/s  (the block was initially at rest before the bullet was fired at it), v₂ = 23 m/s

Substituting these values into equation 2,

v₁ = [{(0.004 × 650)+(0.0950 × 0)}- (0.0950 × 23)]/0.004

v₁ = (2.6 + 0 - 2.185)/0.004

v₁ = 0.415/0.004 = 103.75

v₁ ≈ 104 m/s

7nadin3 [17]2 years ago
6 0

Answer:

26.4 m/s

Explanation:

4 g = 0.004 kg

By the law of momentum conservation, the momentum before and after the impact must be the same

P_{before} = P_{after}

0.004*650 = 0.004*23 + 0.095*v_b

v_b = \frac{2.508}{0.095} = 26.4 m/s

So the speed of the block after the impact is 26.4 m/s

You might be interested in
The mass of a single gold atom is 3.27×10-22 grams. how many gold atoms would there be in 236 milligrams of gold?
blsea [12.9K]

The amount of gold atoms could be calculated by dividing the total weight of the gold with the mass of a single gold atom. Just convert the given weight to grams then divide it with 3.27x10^-22 grams. The answer would be 7.22x10^20. 

8 0
3 years ago
Read 2 more answers
Which statement best describes the circular flow model?
aleksley [76]
Can you please include the statement or the model?
3 0
1 year ago
A horizontal wire of length 0.53 m. carrying a current of 7.5 A. is placed in a uniform external magnetic field. When the wire i
Lady_Fox [76]

Answer:

3.4 mT

Explanation:

L = 0.53 m

i = 7.5 A

Theta = 19 degree

F = 4.4 × 10^-3 N

Let B be the strength of magnetic field.

Force on a current carrying conductor placed in a magnetic field.

F = i × L × B × Sin theta

4.4 × 10^-3 = 7.5 × 0.53 × B × Sin 19

B = 3.4 × 10^-3 Tesla

B = 3.4 mT

6 0
2 years ago
You can carry a 50 N weight up a flight of stairs that is 3 m high in 10 s. Then you carry 40 N up two flights of stairs in 20 s
d1i1m1o1n [39]
You can do 50 and 10 and carry the 30 and it would be in the same power so you’ll have the same energy
5 0
2 years ago
Which of the statements concerning light are true? The speed of light is the same no matter what material it is traveling throug
wel

Answer:

The statements that are true concerning light are the last three statements:

  • Its propagation direction is perpendicular to both the electric field and the magnetic field.
  • It moves at a constant speed through a vacuum.
  • The speed of light in matter is less than the speed of light in a vacuum.

Explanation:

<em>Light</em> is <em>electromagnetic waves.  </em>

The properties of the electromagnetic waves were established by James Clerk Maxwell.

They included that they are the result of the oscillation of a <em>magnetic field </em>in phase with an <em>electric field</em> which are always is always <em>perpendicular</em> to each other.

Also, the electromagnetic waves propagate at right-angles to the direction of both the magnetic and the electric field,  meaning that they are a type of transverse wave.

Thus, the second statement (<em>"Its propagation direction is parallel to both the electric field and the magnetic field"</em>) is false, and the fourth statement ("Its propagation direction is perpendicular to both the electric field and the magnetic field") is true.

On the other hand, it is a postulate of the special theory of relativity that the speed of light is a constant (absolute value) in vacuum: nothing can travel faster than what light travels in vacuum. Thus, the fifth statement, <em>"It moves at a constant speed through a vacuum"</em> is true.

About the speed of light in matter, it is always less than the speed of light in vacuum. Thus, the first statement, "<em>the speed of light is the same no matter what material it is traveling through</em>", and the third statement "<em>the speed of light in matter is greater than the speed of light in a vacuum"</em> are false; while the last statement, "<em>the speed of light in matter is less than the speed of light in a vacuum</em>" is true.

The explanation on why the speed of light is less in a medium than in vacuum is related with the fact that at nanoscopic level the waves suffer polarization which means deviations from the straighi path, which makes that the net straight propagation is slower.

8 0
3 years ago
Other questions:
  • Wind blows from what pressure to what pressure
    5·1 answer
  • All of the following statements are correct except ________ .
    12·2 answers
  • How much heat is needed to raise the temperature of 8grams of water by 19°C
    9·1 answer
  • Which most likely has the greatest conductivity?
    14·2 answers
  • Which statements describe how a machine can help make work easier? Select two options.
    9·1 answer
  • Select all of the following that describes momentum, p [mark all correct answers]
    11·1 answer
  • A backyard swimming pool holds 150 cubic yards (yd3) of water. what is the weight of the water in pounds?
    12·1 answer
  • How do we find work from a force-displacement graph when the force exerted<br> is not constant?
    11·1 answer
  • An athlete whirls a 8.00 kg hammer m from the axis of rotation in a horizontal circle, as shown in the figure below . The hammer
    8·1 answer
  • a person walks 750m due north then 250 m due east of the entire walk takes 12 min find the person average velocity​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!