To solve any problem in math or physics, you collect all the formulas,
laws, rules, and equations that you know about the subject, then, along
with the given information, use them to find the missing information.

So the answer to "how" really depends on what information you're given.

3 0

3 years ago

A 1800 kg car moving south at 17.5 m/s collide with a 2800 kg car moving north. The cars stick together and move as a unit after

weqwewe [10]

Answer:

v₀₂ = -2.67 m / s

Explanation:

Let's use the conservation of the moment, for this we define a system formed by the two cars.

Consider the north direction as positive and the subscript 1 will be used for car 1 and the subscript 2 for the second car

Initial instant. Before the crash

p₀ = -m₁ v₀₁ + m₂ v₀₂

Final moment. Right after the crash

p_f = (m₁ + m₂) v

p₀ = p_f

-m₁ $v_{o1}$ + m₂ v_{o2} = (m₁ + m2) v_{f}

v₀₂ = $\frac{(m_1 +m_2) v }{m_2}$ + $\frac{m_1 v_{o1} }{m_{1} }$

let's calculate

v₀₂ = $\frac{(1800 +2800) 5.22 + 1800 (-17.5)}{2800}$

v₀₂ = -2.67 m / s

the negative sign indicates that the carriage moves in the opposite direction of the temperies

8 0

3 years ago

a current of 5 ampere is passed for 2 hours in an electric iron having a resistance of 100 ohms calculate the heat produced

Alina [70]

Answer:

$\boxed{\sf Heat \ produced \ (H) = 5 \ kWh}$

Given:

Resistance (R) = 100 Ω

Current (I) = 5 A

Time (t) = 2 hours

To Find:

Heat developed (H) in the electric iron

Explanation:

Formula:

$\boxed{ \bold{ \sf H = I^2Rt}}$

Substituting values of I, R & t in the equation:

$\sf \implies H = {5}^{2} \times 100 \times 2 \\ \\ \sf \implies H = 25 \times 100 \times 2 \\ \\ \sf \implies H = 5000 \\ \\ \sf \implies H = 5 \: kWh$

$\therefore$

Heat developed (H) in the electric iron = 15 kWh

3 0

4 years ago