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
vredina [299]
3 years ago
5

Two boxes are connected to each other by a string as shown in the figure. The 10-n box slides without friction on the horizontal

table surface. The pulley is ideal and the string has negligible mass. What is true about the tension t in the string?

Physics
2 answers:
FromTheMoon [43]3 years ago
5 0

Answer:

T=7.4 N hence T<30 N

Explanation:

The figure is likely to be similar to the one attached. Writing the equation for forces we have

F-T=Fa/g where F is the force, T is tension, a is acceleration and g is acceleration due to gravity. Substituting the figures we have the first equation as

30 N - T = (30/9.81)a

Also, we know that T=F*a/g and substituting  10N for F we obtain the second equation as

T = (10/9.81)a

Adding the first and second equations we obtain

30 = 4.077471967

a Hence

a=\frac {30}{4.077471967}=7.3575 m/s^{2}

and T=a hence

T is approximately 7.4 N

Burka [1]3 years ago
4 0

Answer:

<h2>T < 30N</h2>

Explanation:

According to the figure, we have a system with 2 blocks attached by a string which passes through a pulley. In this case, we have to use Newton't law to find the tension of the string. We need to analyse each block to know what vertical and horizontal forces are present in each of them.

10N block:

Horizontal forces: Tension (T).

Vertical forces: Weight (W).

There's no friction and knowing this values, we can find the mass using: W = mg.

So, m = \frac{W}{g} = \frac{10}{9.8} =1.02 kg.

30N block:

There's no horizontal forces because the block is suspended.

Vertical forces: Tension and Weight.

We can calculate the mass using W = mg

So, m = \frac{W}{g} = \frac{30}{9.8} = 3.06 kg.

Now, we analyse the system, to do so, we need to express vertical forces interactions and horizontal forces interactions:

According to second Newton's Law \sum F = ma.

So, vertically for 30N block: \sum F_{y} = W_{30} - T=ma

Then, horizontally for 10N block: \sum F_{x}= T = ma

So, \left \{ {{W_{30} -T=m_{30} a} \atop {T=m_{10} a}} \right..

Now we have to solve this system replacing <em>a </em>from the second equation into the first one:

a=\frac{T}{m_{10} }

W_{30} - T = m_{30}(\frac{T}{m_{10} }   )

Replacing all values and solving for T:

30N - T = 3.06kg\frac{T}{1.02kg} \\30N - T = 3T\\30N=3T + T\\30N = 4T\\\frac{30N}{4} =T = 7.5N

Therefore, the tension in the string has a force of 7.5N, which is less than 30N.

Among the options we have:

  • T=10N
  • T=20N
  • T<30N
  • T>30N

You might be interested in
A 1 kg particle moves upward from the origin to (23) m. Wit is work done by the force of gravity which is in - y direction s B.
sveta [45]

Answer:

Explanation:

mass, m = 1 kg

Position (2, 3 ) m

height, h = 2 m

acceleration due to gravity, g = 9.8 m/s^2

Here, no force is acting in horizontal direction, the force of gravity is acting in vertical direction, so the work done by the gravitational force is to be calculated.

Force  mass x acceleration due to gravity

F = 1 x 9.8 = 9.8 N

Work = force x displacement x CosФ

Where, Ф be the angle between force vector and the displacement vector.

Here the value of Ф is 180° as the force acting vertically downward and the displacement is upward

So, W = 9.8 x 2 x Cos 180°

W = - 19.6 J

Thus, option (A) is correct.

4 0
2 years ago
Which pulls harder the earth or the student
Nana76 [90]

Answer:

wha

Explanation:

5 0
3 years ago
The top of the cylinder head is sealed by the
svetlana [45]
The common name is valve cover, so the correct answer is A.
3 0
3 years ago
Read 2 more answers
When you step into a very full bath or hot tub, sometimes the water overflows. But when you step into a lake and swim, you don't
max2010maxim [7]

Answer:

This all simply due to the size of the two water bodies question and the your body size in a bath tub the water is small enough to allow the upthrust displace water out if the tub whereas in a lake the water is bigger and your body size is smaller to allow any noticeable upthrust that would cause an overflow

8 0
2 years ago
2. A 50 kg diver is standing on the edge of a 15 m high cliff. What is his potential energy?
Lera25 [3.4K]

Answer:

3675 J

Explanation:

Gravitational Potential Energy = \frac{1}{2} × mass × g × height

( g is the gravitation field strength )

Mass = 50 kg

G = 9.8 N/kg ( this is always the same )

Height = 15 m

Gravitational Potential Energy = \frac{1}{2} × 50 ×9.8 × 15

= 3675 J

3 0
2 years ago
Other questions:
  • You are asked to design a horizontal curve with a 40-degree central angle (' = 40) for a two-lane road with 11-ft lanes. the des
    14·1 answer
  • You are standing in front of a flat large mirror. As you step 1.0 m farther from the mirror, the distance between you and your i
    5·1 answer
  • What is thermal equilibrium?
    13·2 answers
  • I really need help with this problem :)
    5·1 answer
  • The buildup of plaque on the walls of an artery may decrease its diameter from 1.1cm to 0.75 cm. If the speed of blood flow is 1
    11·1 answer
  • __________ showed that people learn to behave in certain ways because of reinforcement.
    5·2 answers
  • You find a micrometer (a tool used to
    15·2 answers
  • What would be the approximate PMI of a corpse whose body temperature is determined to be 26.3°C? Average body temperature is 37.
    12·1 answer
  • True or False – All transformations fit the Law of Conservation of Energy.
    10·1 answer
  • Two window washers, Bob and Joe, are on a 3.00 m long, 395 N scaffold supported by two cables attached to its ends. Bob weighs 8
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!