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
aivan3 [116]
3 years ago
13

A 350-kg roller coaster car starts from rest at point A and slides down a frictionless loop-the-loop (Pig. P7.41). (a) How fast

is this roller coaster car moving at point B? (b) How hard does it press against the track at point B?
Physics
2 answers:
Mrac [35]3 years ago
6 0

Answer:

(a)v2 = 16m/s at point B

(b) F = 1.49×10⁴N.

Explanation:

Given m = 350kg

At A, h = 25m

At B h = 12m

(a) We are required to calculate the speed at this point, B.

This problem involves the application of the concept of conservation of mechanical energy for its solution since gravity is the only force doing work on the system.

So for this system,

ΔKE = – ΔPE

1/2×m(v2²– v1²) =– mg(h2 – h1)

From the diagram, g

h2 = 12m, h1 = 25m. From the question it was stated that the car starts from rest so v1 = 0m/s

In the above equation m is common to both sides so they cancel out. So,

1/2×(v2²– 0²) = – g(12 – 25)

1/2v2² = 13g

V2² = 2 ×13g = 26×9.80

v2 ² = 254.8

v2 = √254.8 = 15.96m/s ≈ 16m/s.

Energy concepts have been used to solve this problem. In this approach only the start and end points are taking into consideration when doing analysis on any problem of this sort and not what happens in between.

(b) Ghis part is asking us to calculate the force at point B.

At point B the car is moving in a uniform circle of diameter 12m (radius 6m)

So the acceleration of the car at point B

a = v²/r

v = 16m/s, r = 6m

F = ma = m×v²/r = 350×16²/6 = 14933.33N

F = 1.49×10⁴N.

Leona [35]3 years ago
3 0

Answer:

a)Velocity of car =v=16 m/s

b)Force against the track at point B=1.15*10^{4}N

Explanation:

Given mass of roller coaster=m=350 kg

Position of A=Ha=25 m

Position of B=Hb=12 m

Net potential energy=mg(ha-hb)

Net potential energy=(350)(9.80)(25-12)

Net potential energy=44590 J

Using energy conservation

net kinetic energy=net potential energy

(1/2)mv^2=mg(ha-hb)

m=350

velocity=v=16 m/s

b)There two force acting,centripetal force upward and gravity downward.

Thus net force acting will be

Net force=(mv^2/r)-mg

Net force=14933.33-3430

Net force=1.15*10^{4} N

You might be interested in
What happens to the frequency of a wave If the wavelength is decreased by half
podryga [215]

Answer:

Frequency  doubles.

Explanation:

Frequency doubles because Wavelength and Frequency are inversely proportional. That means if one decreases the other one increases. So, if wavelength is half, frequency is the opposite, doubles.

8 0
3 years ago
Both X-rays and gamma rays have higher frequencies than ultraviolet rays <br> True or False
mamaluj [8]

Answer:

i believe its True

Explanation:

7 0
3 years ago
Read 2 more answers
When the switch is closed, what happens to the current in the circuit? (The intrinsic resistance of the inductor is zero.)
Hitman42 [59]
The best and most correct answer among the choices provided by your question is the second choice or letter B.

<span>When the switch is closed, the current instantaneously becomes 1.</span>

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
6 0
3 years ago
What do we call air in the motion​
r-ruslan [8.4K]
Answer: i think its wind
3 0
3 years ago
Read 2 more answers
If you want to make a strong battery, should you pair two metals with high electron affinities, low electron affinities, or a mi
zalisa [80]

A mix

Explanation:

A battery is an electrochemical cell that converts chemical energy into electrical energy. The chemical reactions in a battery ensures that current is produced.

  • A battery is made up of two electrodes which are the cathode and anode.
  • The cathode is the positive electrode and the anode is the negative one.
  • These electrodes are made up of metals.
  • Electrons moves from the anode to the cathode and current flows from cathode to anode.
  • At the anode oxidation occurs because electrons are produced here.
  • It needs to have low electron affinity.
  • At the cathode where reduction occurs, the electron affinity must be high.
  • This is the driving force for the production of electricity in electrochemical cells.

Learn more:

Battery brainly.com/question/8892837

#learnwithBrainly

6 0
3 years ago
Other questions:
  • If the resistance doubles while the voltage stays the same, what effect will that have on the power?
    12·1 answer
  • A spring stretches by 18 cm when a bag of potatoes weighing 56 N is suspended from its end. How much elastic potential energy in
    8·1 answer
  • A photon of ultraviolet (uv) light possesses enough energy to mutate a strand of human dna. what is the energy of a single uv ph
    12·1 answer
  • When you flick a coin so that it slides across a table, what four forces are acting on the coin?
    13·2 answers
  • The motor of a four wheeler traveling along a muddy trail generates an average power of 7.48 104 W when moving at a constant spe
    13·2 answers
  • A 6 kg block is released from rest at the top of an incline, as shown above, and slides to the bottom. The incline is 1.97 m lon
    10·1 answer
  • 2. A science book is being pushed across a table. Can the book have a constant speed and a
    12·1 answer
  • Why we don’t feel atmospheric pressure?
    15·2 answers
  • Which statement about a Ferris wheel is true?
    9·1 answer
  • A remote control car with a mass of 2.45kg generates a thrust force of 31.8N. The car experiences a frictional force due to a co
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!