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
Mumz [18]
3 years ago
8

3) A lead bullet initially at 30 C just melts upon striking a target. Assuming that all of the initial kinetic energy of the bul

let goes into the internal energy of the bullet to raise its temperature and melt it, calculate the speed of the bullet upon impact. (Specific heat of lead is 0.128 kJ/kg K and lead latent heat of fusion is 24.7 kJ/Kg and melting point of lead is 600 K).
Physics
1 answer:
xeze [42]3 years ago
6 0

Answer:

The speed of bullet is 354.2 m/s

Explanation:

initial temperature, T = 30 degree C

specific heat, c = 128 J/kg K

Latent heat, L = 24.7 x 1000 J/kg

melting point = 600 K = 327 degree C

Let the mass is m and the speed is v.

Kinetic energy = heat used to increase the temperature + Heat used to melt

\frac{1}{2} mv^2 = m c (T' - T) + m L\\\\0.5 v^2 = 128 \times (327 - 30) + 24.7\times 1000\\\\0.5 v^2 = 38016 + 24700 \\\\0.5 v^2 = 62716\\\\v = 354.2 m/s

You might be interested in
What does the law of conservation of energy state about both sides of the chemical reaction
lesya [120]

Answer: D

Explanation: Energy is neither created nor destroyed so the amount of reactants and products must be equal

4 0
3 years ago
Damon purchased a pair of sunglasses that were advertised as being polarized. Describe how Damon could test the sunglasses to ve
Andre45 [30]

Answer:

To verify that they're polarized, he could hold the two lenses perpendicular (90 degrees) to each other, one lens in front of the other, and point it at a light source. If no light passes through then the lenses are polarized

6 0
4 years ago
How does visible Light travel through outer space?
Dima020 [189]
By the electromagnetic "vibrations" that make up light. Said EM vibrations are an electric field and a magnetic field at right angles to each other and to the direction of propagation/travel. Light travels by the same "mechanism" that X rays travel, radio waves travel and anything else in the vast electromagnetic spectrum. Probably how I'm able to type these words on a computer key board and have them transmitted "Wi Fi" like, to you, the hapless recipient. You're a Cheetah ??? That means you can run like the wind ????
7 0
4 years ago
A test charge of -1.4 x 10-7 coulombs experiences a force of 5.4 x 10-1 newtons. Calculate the magnitude of the electric field c
VARVARA [1.3K]

Answer:

3.86×10⁶ Newton/coulombs

Explaination:

Applying,

E = F/q....................... Equation 1

Where E = Electric Field, F  = Force, q = charge.

From the question,

Given: F = 5.4×10⁻¹ N, q = -1.4×10⁻⁷ coulombs

Substitute these values into equation 1

E = 5.4×10⁻¹/ -1.4×10⁻⁷

E = -3.86×10⁶ Newtons/coulombs

Hence the magnitude of the electric field created by the

negative test charge is 3.86×10⁶ Newton/coulombs

5 0
3 years ago
It which medium would light have the longest wavelength
Shtirlitz [24]

Visible light waves are the only electromagnetic waves we can see has the longest wavelength

4 0
4 years ago
Read 2 more answers
Other questions:
  • Here we will look at a more complex problem for which we will use all three of our primary constant acceleration equations. a mo
    12·1 answer
  • A 5.0 A current is set up in a circuit for 6.0 min by a rechargeable battery with a 6.0 V emf. By how much is the chemical energ
    14·1 answer
  • suppose it is known that the earth attracts an object with a force that decreases as the rate of 2 N/km when r=30,000 km. how fa
    13·1 answer
  • Are Constellations based on the magnitude of stars.
    10·2 answers
  • In the bohr model of the hydrogen atom the electron circulates around the nucleus in a path of radius 5.1❌10^-11 meter at a freq
    6·1 answer
  • Of the eighteen elements in the fourth period, which a. has the largest atomic radius? b. has the smallest first ionization ener
    5·1 answer
  • A magnet is useful in generating electricity because a magnetic force moves
    15·1 answer
  • __________ is the belief that one gender is superior to the other.
    6·2 answers
  • Would you classify a hotdog as a conductor or insulator?
    9·1 answer
  • A helicopter is accelerating up into the air while it is also accelerating due north. Which statement about the forces acting on
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!