![ozheng24112](/avatars/45289.jpg)
ozheng24112
22.09.2019 •
Physics
5. a massless string passes over a frictionless pulley and carries
mass m, hanging at one end and mass 'mz' connected by another
mass less sting to mass 'mz' at the other end as shown in figure.
calculate the tension in the string joining the mass m2 and m3.
Solved
Show answers
More tips
- F Food and Cooking How to Make Napoleon Cake: A Step-by-Step Guide...
- F Food and Cooking From Latte to Espresso: Which Coffee Drink is the Most Popular on Earth?...
- C Computers and Internet How to Set Up Internet on iPhone? Detailed Guide with Step-by-Step Instructions...
- P Philosophy 8 привычек, чтобы достичь счастливой жизни...
- F Food and Cooking How Many Grams Are In a Tablespoon?...
- G Goods and services How to Choose the Right Iron: Purchase Tips...
- S Style and Beauty How to Choose the Perfect Hair Straightener?...
- H Health and Medicine How to Choose the Right Glasses?...
- H Health and Medicine What vaccines do children need?...
- H Health and Medicine AKDS Vaccination: Ensure Your Child s Safety...
Answers on questions: Physics
- P Physics An object is moving with a constant velocity of 278 m/s. how long will it take it to travel 7500 m, using the formula delta x=vt+1/2at^2...
- P Physics What type of bond involves the transfer of electrons between two elements? a. ionic b. covalent...
- P Physics Suc k my very fat n i gg er co cker b b b b b b b b bb b b?...
- P Physics Your workouts should include elements of which of the following?A. Cardio TrainingB. Strength TrainingC. Flexibility TrainingD. All of the above...
- P Physics What must be the initial angular speed, of the top disk be so that when it is dropped onto the bottom disk the final angular speed of the disks is equal in magnitude to the...
- P Physics Draw a circuit with a battery connected to four resistors, R1, R2, R3, and R4, as follows. Resistors R1 and R2 are connected in parallel with each other, resistors R3 and...
- P Physics Question is in the image attached....
- P Physics Based on the data, which statement BEST describes sound?...
- M Mathematics Given this explicit equation, what is the common difference? f(n)=8n+2...
- M Mathematics What would be the density of a piece of glass that has a volume of 25.6 cm3 and a mass of 62.11 grams? Show your work....
Ответ:
2m₁m₃g / (m₁ + m₂ + m₃)
Explanation:
I assume the figure is the one included in my answer.
Draw a free body diagram for each mass.
m₁ has a force T₁ up and m₁g down.
m₂ has a force T₁ up, T₂ down, and m₂g down.
m₃ has a force T₂ up and m₃g down.
Assume that m₁ accelerates up and m₂ and m₃ accelerate down.
Sum of the forces on m₁:
∑F = ma
T₁ − m₁g = m₁a
T₁ = m₁g + m₁a
Sum of the forces on m₂:
∑F = ma
T₁ − T₂ − m₂g = m₂(-a)
T₁ − T₂ − m₂g = -m₂a
(m₁g + m₁a) − T₂ − m₂g = -m₂a
m₁g + m₁a + m₂a − m₂g = T₂
(m₁ − m₂)g + (m₁ + m₂)a = T₂
Sum of the forces on m₃:
∑F = ma
T₂ − m₃g = m₃(-a)
T₂ − m₃g = -m₃a
a = g − (T₂ / m₃)
Substitute:
(m₁ − m₂)g + (m₁ + m₂) (g − (T₂ / m₃)) = T₂
(m₁ − m₂)g + (m₁ + m₂)g − ((m₁ + m₂) / m₃) T₂ = T₂
(m₁ − m₂)g + (m₁ + m₂)g = ((m₁ + m₂ + m₃) / m₃) T₂
m₁g − m₂g + m₁g + m₂g = ((m₁ + m₂ + m₃) / m₃) T₂
2m₁g = ((m₁ + m₂ + m₃) / m₃) T₂
T₂ = 2m₁m₃g / (m₁ + m₂ + m₃)
Ответ:
Explanation:
The benefits of more efficient use of energy are well known and include reduced investments in energy infrastructure, lower fossil fuel dependency, increased competitiveness and improved consumer welfare. ... We must find new ways to accelerate the decoupling of energy use and CO2 emissions from economic growth