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
iVinArrow [24]
3 years ago
9

A 4.0 kg model rocket is launched, shooting 50.0 g of burned fuel from its exhaust at an average velocity of 625 m/s. What is th

e velocity of the rocket after the fuel has burned?
Physics
1 answer:
Scorpion4ik [409]3 years ago
8 0

Answer:

Velocity of rocket will be equal to 7.81 m/sec

Explanation:

We have given mass of the rocket m_1=4kg

Mass of fuel is given m_2=50gram=0.05kg ( As 1 kg is equal to 1000 gram )

Velocity of fuel v_2 = 625 m/sec

We have to find the velocity of rocket v_1

From conservation of momentum we know that initial momentum is equal to final momentum '

So m_1v_1=m_2v_2, here m_1 is mass of rocket v_1 is velocity of rocket m_2 is mass of fuel and v_2 is velocity of fuel

So 4\times v_1=625\times 0.05

v_1=7.81m/sec

So velocity of rocket will be equal to 7.81 m/sec

You might be interested in
A 3.3 kg ball sits on the ground and is kicked with a FAPP of 36N
jeyben [28]

a) 32.3 N

The force of gravity (also called weight) on an object is given by

W = mg

where

m is the mass of the object

g is the acceleration of gravity

For the ball in the problem,

m = 3.3 kg

g = 9.8 m/s^2

Substituting, we find the force of gravity on the ball:

W=(3.3)(9.8)=32.3 N

b) 48.3 N

The force applied

F_{app} = 36 N

The ball is kicked with this force, so we can assume that the kick is horizontal.

This means that the applied force and the weight are perpendicular to each other. Therefore, we can find the net force by using Pythagorean's theorem:

F=\sqrt{W^2+F_{app}^2}

And substituting

W = 32.3 N

Fapp = 36 N

We find

F=\sqrt{32.3^2+36^2}=48.3 N

c) 14.6 m/s^2

The ball's acceleration can be found by using Newton's second law, which states that

F = ma

where

F is the net force on an object

m is its mass

a is its acceleration

For the ball in this problem,

m = 3.3 kg

F = 48.3 N

Solving the equation for a, we find

a=\frac{F}{m}=\frac{48.3}{3.3}=14.6 m/s^2

8 0
3 years ago
A piece of wood is floating in a tub of water. A second piece of wood rests on top of the first piece; it does NOT touch the wat
andreev551 [17]

Answer:

C)

Explanation:

The buoyancy and weight of the wood have to be equal for the system to be in equilibrium. The total mass (then, weight) of the wood is the same, so the total buoyancy has to be the same. Since buoyancy is the weight of the liquid displaced, the volume of liquid displaced will be the same in either case, which means that the water level will remain unchanged.

7 0
3 years ago
In which case would electrical potential energy be built up and stored in the electric field? a) A positive charge is moved towa
mr_godi [17]

Answer:

The correct option is B

Explanation:

Although, it is common knowledge that in an electric field, unlike charges attract and like charges repel. However, to build up an electric potential, a positive charge is brought close to another positive charge - this causes work done to be changed to electric potential energy and stored in the electric field.

It should however be noted that when a negative charge is moved away from a positive charge, the negative charge gains electric potential energy.

5 0
2 years ago
TRUE OR FLASE
BaLLatris [955]

Answer:

true for first and false for second

Explanation:

5 0
2 years ago
What is mantle convection?
Anna007 [38]
Mantle convection<span> is the slow creeping motion of Earth's solid silicate </span>mantle<span> caused by </span>convection<span> currents carrying heat from the interior of the Earth to the surface.

</span>
8 0
3 years ago
Other questions:
  • In a crash or collision, why is it advantageous for an occupant to extend the time during which the collision is taking place?
    14·1 answer
  • Science and math people where you at
    8·1 answer
  • What are anticlines and synclines?
    5·1 answer
  • The column has a mass of 600 lb/ft and a force of 50 kips applied at the top. The diagonal brace has a 10 kip axial force that c
    13·1 answer
  • A piece of aluminum foil has a known surface density of
    6·1 answer
  • How much 8 grams will weigh after a physical change
    14·1 answer
  • What is the SI unit for speed?
    11·2 answers
  • How do we use the earth’s heat by capturing geothermal energy?
    5·1 answer
  • What is the resistance force when you walk up an inclined plane?<br> Please help quick!
    6·1 answer
  • What types of electromagnetic radiation does the sun emit?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!