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
PtichkaEL [24]
3 years ago
14

Which statement(s) accurately describe the conditions immediately before and after the firecracker explodes:

Physics
1 answer:
lidiya [134]3 years ago
8 0

Answer:

Option C, The total momentum of the fragments is equal to the original momentum of the firecracker.

Explanation:

Kinetic energy of cracker cannot remain constant before and after explosion. It is so because in the process of burning and bursting some amount of kinetic energy is lost in the form of light and heat energy. While the total mass before and after the explosion remains constant due to which the momentum is conserved before and after the explosion

Hence, option C is correct

You might be interested in
A sled slides along a horizontal surface on which the coefficient of kinetic friction is 0.25. Its velocity at point A is 8.4 m/
Bad White [126]

Answer:

1.06 secs

Explanation:

Initial speed of sled, u = 8.4 m/s

Final speed of sled, v = 5.8 m/s

Coefficient of kinetic friction, μ = 0.25

Using the impulse momentum theory, we know that the impulse applied to the sled is equal to change in momentum of the sled:

FΔt = mv - mu

where m = mass of the object

Δt = time interval

F = force applied

The force applied on the sled is the frictional force, which is given as:

F = -μmg

where g = acceleration due to gravity

Therefore:

-μmgΔt =  mv - mu

-μmgΔt = m(v - u)

-μgΔt = v - u

Making Δt subject of formula:

Δt = (v - u) / -μg

Δt = (5.8 - 8.4) / (-0.25 * 9.8)

Δt = -2.6/ -2.45

Δt = 1.06 secs

It took the sled 1.06 secs to travel from A to B.

7 0
3 years ago
A certain lightning bolt moves 10.0 C of charge. How many charges have been moved if the fundamental unit of charge is 1.6 x 10-
Andrej [43]

To solve this problem, use the ratio given by the total number of electrons or protons that exist as a function of the total charge, and inversely proportional to the value of the fundamental charge. The number of fundamental unit  |q_e| that constitutes a charge of 40.0C can be calculated as

N = \frac{|Q|}{|q_e|}

Here,

q_e = Value of charge and it is the fundamental charge

Q = Total Charge

N = Total number of electron or protons

The number of fundamental units is calculated as follows

N = \frac{10.0C}{1.6*10^{-19}C}

N = 6.25*10^{19}

Therefore the number of fundamental charge units moved by lightning bolt is 6.25*10^{19}

8 0
3 years ago
The Voyager 1 spacecraft, shown below, completed its space exploration mission in 1980 and has since been traveling away from Ea
aleksklad [387]
I think b hope this helps
4 0
3 years ago
Read 2 more answers
The launch speed of a projectile is three times the speed it has at its maximum height.what is the elevation angle at launch?
Sphinxa [80]

Answer:

Given: a projectile of initial launch velocity(V) and launch angle ∅ and no air resistance. At the maximum height, the projectile would have a zero contribution of speed from the vertical component(Vy) Therefore, if we say Vx=Vcos∅ is the only speed the projectile has at the instant of maximum height then we can replace Vx with 1/5V and write 1/5V=Vcos∅. Solving for the the launch angle ∅, gives Inverse Cos(1/5)=78.5 degrees.

6 0
2 years ago
Which is more dense, a pound of rice or a pound of cement?
k0ka [10]
I had a question like this one time and the answer is a pound of cement
4 0
3 years ago
Read 2 more answers
Other questions:
  • When hot and cold air meet, the hot air rises to the top. What causes the hot air to rise???
    10·1 answer
  • A portable television using a 12 volt, 3 Ah rechargeable battery can operate for a period of about 6 hours. What is the average
    7·1 answer
  • A soccer ball is kicked horizontally off a bridge with a height of 36 m. The ball travels 25 m horizontally before it hits the p
    11·1 answer
  • an object of mass 1kg was at rest before it fell through a height o 5m and hit the ground. Calculate the initial gravitational p
    7·2 answers
  • A spherical shell of radius 9.0 cm carries a uniform surface charge density σ= 9.0 nC/m2. The electric field at r= 9.1 cm is app
    5·1 answer
  • 3. What are the forces present on the rope?​
    9·1 answer
  • Assuming you exert a constant force on the wagon, how fast is it moving after 5 seconds?
    6·1 answer
  • Which statement is true about historical models of the solar system?
    8·1 answer
  • A tennis player swings and hits the ball away. How does the force of the tennis racket affect the motion of the ball
    15·1 answer
  • Why electromagnetic energy is renewable? Explain.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!