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
olga nikolaevna [1]
3 years ago
14

A block of mass m=1.2 kg is held at rest against a spring with a force constant k=730N/m. Initially the spring is compressed a d

istance d. When the block is released, it slides across a surface that is frictionless except for a rough patch of width ????x= 5.0 cm that has coefficient of kinetic friction µk =0.44 Find a general expression of d such that the block’s speed after crossing the rough patch is Vf = 2.3 m/s. Also calculate the value of d. How does the friction effect the d to reach the same Vf?
Physics
1 answer:
igor_vitrenko [27]3 years ago
5 0

Answer:

Explanation:

potential energy of compressed spring

= 1/2 k d²

= 1/2 x 730 d²

= 365 d²

This energy will be given to block of mass of 1.2 kg in the form of kinetic energy .

Kinetic energy after crossing the rough patch

= 1/2 x 1.2 x 2.3²

= 3.174 J

Loss of energy

= 365 d² - 3.174  

This loss is due to negative work done by frictional force

work done by friction = friction force x width of patch

= μmg d ,   μ = coefficient of friction , m is mass of block , d is width of patch

= .44 x 1.2 x 9.8 x .05

= .2587 J

365 d² - 3.174   = .2587

365 d² = 3.4327

d² = 3.4327 / 365

= .0094

d = .097 m

= 9.7 cm

If friction increases , loss of energy increases . so to achieve same kinetic energy , d will have to be increased so that initial energy increases so compensate increased loss .

You might be interested in
6 jam jars of volume 0.37m3 are filled with Jam. An empty jam jar has a weight 200g each. The weight of all 6 jars filled with j
marta [7]

Answer:

0.14594 g/cm³

Explanation:

Density  =  Mass / Volume

Mass = 5400 g

Volume = 0.37 m³

Density = M /V

volume = 0.37 m³  = 37000 cm³

Density   =  \frac{5400}{37000}

               = 0.14594 g/cm³

6 0
3 years ago
A coil formed by wrapping 65 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the
Fiesta28 [93]

Answer:

377 m

Explanation:

number of turns, N = 65

θ = 36°

B1 = 200 micro Tesla

B2 = 600 micro tesla

t = 0.4 s

induced emf, e = 80 mV

Let a be the side of the square coil.

e=\frac{d\phi }{dt}=NA\frac{dB}{dt}\times Sinθ

0.080=\frac{65\times a^{2}\times Sin36\times\left ( 600 - 200 \right )\times 10^{-6}}{0.4}

0.080=0.038a^{2}

a = 1.45 m

Total length of the wire, L = N x 4a = 65 x 4 x 1.45 = 377 m

Thus, the length of the wire is 377 m.

7 0
3 years ago
Which of these is an advantage of using models to study tectonic plate movements?
ratelena [41]
Actual plate movements can be made les frequent.
5 0
3 years ago
A 5 kg block is resting on a ramp inclined at 35 degrees above the horizontal. What is the magnitude of the normal force acting
Mamont248 [21]
I'm pretty sure the answer is b 28n hope helps :)
4 0
3 years ago
Solid barium sulfate is placed into a beaker to form a saturated solution of barium sulfate. the solution has a barium concentra
borishaifa [10]
Ksp = [Ba⁺²][SO₄⁻²]

[Ba⁺²] = [SO₄⁻²] for barium sulfate
Thus,
Ksp = (1 x 10⁻⁵)²
Ksp = 1 x 10⁻¹⁰
5 0
3 years ago
Read 2 more answers
Other questions:
  • you push the ball with a force of 22.8N which induces a -2.3 frictional force what is the net force while you push the ball
    14·1 answer
  • PLEASE ANSWER QUICK!!! 2. Every magnet has _ unlike poles.
    7·1 answer
  • Which of the following is a luminous object? the Moon Jupiter a comet the Sun
    7·2 answers
  • What is true about all uranium atoms?they each have the same number of nuclear particles.they each have the same number of neutr
    15·2 answers
  • I have a table that I recorded of my data and my partner's data
    12·1 answer
  • Carnot engine A has an efficiency of 0.57, and Carnot engine B has an efficiency of 0.72. Both engines utilize the same hot rese
    10·1 answer
  • Why is it important for scientists to use the scientific method?
    11·1 answer
  • 3. One effective method for coping with change is using:
    14·1 answer
  • Explain the difference in how particles are arranged in a solid,liquids and gases
    15·2 answers
  • A large stone block is to be part of a harbour wall. The block is supported beneath the surface of the sea by a cable from a cra
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!