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
Nadusha1986 [10]
3 years ago
15

Block A of mass M is on a horizontal surface of negligible friction. An identical block B is attached to block A by a light stri

ng that passes over an ideal pulley. The tension force exerted on block A after the system is released from rest has magnitude T. Block B is then replaced by a block of mass 2M and the system again released from rest.
Which of the following is a correct expression for the tension force now exerted on block A?

a) 12T b) 23T c) 34T d) 43T e) 2T
Physics
1 answer:
miv72 [106K]3 years ago
4 0

Answer:

T’= 4/3 T  

The new tension is 4/3 = 1.33 of the previous tension the answer e

Explanation:

For this problem let's use Newton's second law applied to each body

Body A

X axis

      T = m_A a

Axis y

     N- W_A = 0

Body B

Vertical axis

     W_B - T = m_B a

In the reference system we have selected the direction to the right as positive, therefore the downward movement is also positive. The acceleration of the two bodies must be the same so that the rope cannot tension

We write the equations

    T = m_A a

    W_B –T = M_B a

We solve this system of equations

     m_B g = (m_A + m_B) a

    a = m_B / (m_A + m_B) g

In this initial case

     m_A = M

     m_B = M

     a = M / (1 + 1) M g

     a = ½ g

Let's find the tension

    T = m_A a

    T = M ½ g

    T = ½ M g

Now we change the mass of the second block

    m_B = 2M

    a = 2M / (1 + 2) M g

    a = 2/3 g

We seek tension for this case

    T’= m_A a

    T’= M 2/3 g

   

Let's look for the relationship between the tensions of the two cases

   T’/ T = 2/3 M g / (½ M g)

   T’/ T = 4/3

   T’= 4/3 T

The new tension is 4/3 = 1.33 of the previous tension the answer  e

You might be interested in
Scientists have designed solar cells to trap solar energy and convert it to _____ energy.
lapo4ka [179]
Scientists have designed solar cells to trap solar energy and convert it to D electrical energy. Its D because converting something has to do with recharging something and electronics have to charge. I hope I helped. 
6 0
3 years ago
Read 2 more answers
What is the correct answer?
LUCKY_DIMON [66]

Answer:

I think is d and you or very pretty

Explanation:

8 0
2 years ago
The site<br> of proteins is called what
ValentinkaMS [17]

Answer: Ribosomes are the site of protein synthesis, and they convert the coded information in messenger RNA into an actual protein molecule.

I hope this helped! OvO

8 0
3 years ago
Read 2 more answers
Referring to the above diagram, how high will the ball rise on the right-hand incline?
Marina CMI [18]
I think it’s 15cm
Might be 7cm
3 0
3 years ago
Express the kinetic energy K in terms of the potential energy U.<br><br><br> K=GMm/2R
max2010maxim [7]

Answer:

K = -½U

Explanation:

From Newton's law of gravitation, the formula for gravitational potential energy is;

U = -GMm/R

Where,

G is gravitational constant

M and m are the two masses exerting the forces

R is the distance between the two objects

Now, in the question, we are given that kinetic energy is;

K = GMm/2R

Re-rranging, we have;

K = ½(GMm/R)

Comparing the equation of kinetic energy to that of potential energy, we can derive that gravitational kinetic energy can be expressed in terms of potential energy as;

K = -½U

7 0
3 years ago
Other questions:
  • Please any one need help on this
    9·1 answer
  • Alisha uses wire to connect a battery, a lightbulb, and a switch, but the bulb does not light up even though the switch is in th
    15·1 answer
  • For your senior project, you would like to build a cyclotron that will accelerate protons to 10% of the speed of light. The larg
    8·1 answer
  • Which pair of forces will give a resultant of the least value? (5
    12·1 answer
  • As the car falls off the cliff, what is happening to the kinetic energy of the falling car?
    12·1 answer
  • A wheel turns through 5.5 revolutions while being accelerated from rest at 20rpm/s.(a) What is the final angular speed ? (b) How
    12·1 answer
  • What is the frequency of microwaves of wavelength 3 cm?
    11·1 answer
  • A car with a mass of 1500 kg is pulled by a rope that is horizontal to the ground. The tension in the rope is 2000 N and a frict
    8·1 answer
  • A 2.00 kg rock is dropped from the top of a 30.0 m high building. Calculate the ball’s momentum at the time that it strikes the
    10·1 answer
  • 11. Distinguish between solid and liquid states of matter in terms of intermolecular forces​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!