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
Alex Ar [27]
3 years ago
13

A spring of original length 3.0 cm is extended to a total length of 5.0 cm by a force of 8.0N

Physics
2 answers:
miss Akunina [59]3 years ago
8 0

Answer:

12.0N

Explanation:

This problem is solved using Hooke's law which states that the extension or compression experienced by an elastic material is proportional the the force or load applied provided that the elastic limit is not exceeded.

F=ke..................(1)

where F is the force applied, k is the elastic constant and e is the extension of the material.

e=l_1-l_o..................(2)

were l_o is the original length of the material and l_1 is its total length after extension.

Given;

F = 8.0N

l_o=3cm\\l_1=5cm\\k=?

therefore,

e=5-3\\e=2cm

substituting all necessary values into equation (1), we get;

8=k*2\\k=\frac{8}{2}\\k=4N/cm

The force required to give the spring a total length of 6cm is thus calculated;

in this case,

l_1=6cm\\therefore\\e=6-3\\e=3cm

hence F is given as follows;

F=(4N/cm) *3cm\\F=12.0N

hjlf3 years ago
6 0
4848484 5 5 5 5 5  =++++
You might be interested in
Scientists have discovered convection currents inside Earth. Explain how these convection currents move and what layer(s) they o
fgiga [73]

Answer:

I don't know what to do

Explanation:

So

7 0
3 years ago
Read 2 more answers
A 2,700-kg truck runs into the rear of a 1,000-kg car that was stationary. The truck and car are locked together after the colli
Leto [7]

Answer:

6200 J

Explanation:

Momentum is conserved.

m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂

The car is initially stationary.  The truck and car stick together after the collision, so they have the same final velocity.  Therefore:

m₁ u₁ = (m₁ + m₂) v

Solving for the truck's initial velocity:

(2700 kg) u = (2700 kg + 1000 kg) (3 m/s)

u = 4.11 m/s

The change in kinetic energy is therefore:

ΔKE = ½ (m₁ + m₂) v² − ½ m₁ u²

ΔKE = ½ (2700 kg + 1000 kg) (3 m/s)² − ½ (2700 kg) (4.11 m/s)²

ΔKE = -6200 J

6200 J of kinetic energy is "lost".

3 0
3 years ago
When the core of a star like the sun uses up its supply of hydrogen for fusion, the core begins to ________?
pav-90 [236]

When the core of a star like the sun uses up its supply of hydrogen for fusion, the core begins to contract in size. The gravitational forces becomes strong and cause the star to reduce in size. as the star contracts, the temperature of the star also rises since the heat is distributed inside smaller Volume now.

4 0
3 years ago
Read 2 more answers
1) Calculate the ideal efficiency of a heat engine that takes in energy at 800 K and expels heat to a
masha68 [24]

Answer:

Could you explain that more better?

Explanation:

3 0
3 years ago
The minute hand of a wall clock measures 16 cm from its tip to the axis about which it rotates. The magnitude and angle of the d
olya-2409 [2.1K]

Answer:

Explanation:

Given

Minute hand length =16 cm

Time at a quarter after the hour to half past i.e. 1 hr 45 min

Angle covered by minute hand in 1 hr is 360 and in 45 minutes 270

|r|=\frac{3\times 2\pi r}{4}=75.408 cm

Angle =270^{\circ}

(c)For the next half hour

Effectively it has covered 2 revolution and a quarter

|r|=\frac{2\pi r}{4}=25.136 cm

angle turned =90^{\circ}

(f)Hour after that

After an hour it again comes back to its original position thus displacement is same =25.136

Angle turned will also be same i.e. 90 ^{\circ}

7 0
3 years ago
Other questions:
  • Approximately how old is the earth?
    13·1 answer
  • An electrical motor spins at a constant 1975.0 rpm. If the armature radius is 7.112 cm, what is the acceleration of the edge of
    14·1 answer
  • What do significant figures in a measurement include___________________________________.
    7·1 answer
  • How much would you weigh on an imaginary planet that has no gravitational force?<br><br>​
    7·1 answer
  • I NEED HELP PLEASE THANKS :)
    12·1 answer
  • N
    13·1 answer
  • This ray diagram shows the image formed when a candle is placed in front of
    15·1 answer
  • Which is the best example of the use of imagery in a sentence?
    11·1 answer
  • Suppose a shrimp has been put on the ground that has just been taken out of water.Now touch the shrimp from a distance by a stic
    8·2 answers
  • Help this was due yesterday...
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!