> Hi, I got this question in an online assesment and got it 'wrong'. I can't see where I went wrong but maybe I'm missing something.

> Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended a distance 1.40m , its speed is 2.00m/s . If the mass of the 2 blocks combined is 13kg, what is the mass of the larger block?

> I can only seem to get 7kg, but the answer says it should be 7.45.

Using the Energy conservation:
Mgh-mgh=0,5*(M+m)*v^2

You get
M-m = 1.9

And then
M=7.45

• Teaching physics using YouTube videos

Имя *:
E-Mail:
Тема *:

Продублировать ответ по e-mail Игнорировать переносы строк (HTML) Текст ответа*
> > Hi, I got this question in an online assesment and got it 'wrong'. I can't see where I went wrong but maybe I'm missing something. > > Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended a distance 1.40m , its speed is 2.00m/s . If the mass of the 2 blocks combined is 13kg, what is the mass of the larger block? > > I can only seem to get 7kg, but the answer says it should be 7.45. > Using the Energy conservation: > Mgh-mgh=0,5*(M+m)*v^2 > You get > M-m = 1.9 > And then > M=7.45

									Цвет шрифта: По умолчанию Тёмно-красный Красный Оранжевый Коричневый Жёлтый Зелёный Оливковый Голубой Синий Тёмно-синий Индиго Фиолетовый Белый Чёрный

α · β · γ · δ · ε · η · θ · λ · μ · ν · ξ · π · ρ · σ · τ · υ · φ · χ · ψ · ω · Δ · Λ · Ψ · Ω
∂ · ∑ · ∞ · ∫ · ≈ · ≠ · ≡ · ≤ · ≥ · < · > · ± · ² · ³ · µ · ћ · ± · X¹²³ · X₁₂₃ · √ 
 >>
О работе форума - Редактор формул - Транслит - Lat->Рус - Rus->Lat

Добавить URL:
Название URL:        Загрузить рисунок на сервер (gif или jpg) Рисунок (URL):

---

Админу: удалить - переслать
Физика в анимациях - Купить диск - Тесты по физике - Графики on-line

Партнёры: