Answer:
El resorte al comprimirse adquiere energía potencial elástica.
Explanation:
Por conservación de la energía, y si no hay agentes externos (como pérdida de energía por rozamiento), la energía cinética que proviene del movimiento de la puerta al abrirse se transfiere al resorte en forma de energía potencial elástica cuando el resorte se comprime.
En el proceso de descompresión ocurre lo contrario, es decir, la energía potencial elástica del resorte se transforma en energía cinética que es transferida a la puerta para cerrarse.
Por lo tanto, el resorte al comprimirse adquiere energía potencial elástica.
Espero que te sea de utilidad!
Explanation:
Impulse is change in momentum:
I = Δp
I = (1400 kg) (27 m/s) - (1400 kg) (0 m/s)
I = 37800 kg m/s
Impulse is also average force times time:
I = F ΔT
37800 kg m/s = F (7 s)
F = 5400 N
Answer:
A solid hot mass of iron and nickel
a = 3.09 m/s²
<h3>Explanation</h3>
This question doesn't tell anything about how long it took for the car to go through 105 meters. As a result, the <em>timeless </em>suvat equation is likely what you need for this question.
In the <em>timeless</em> suvat equation,
![a = \dfrac{v^2 - u^2}{2\; x}](https://tex.z-dn.net/?f=a%20%3D%20%5Cdfrac%7Bv%5E2%20-%20u%5E2%7D%7B2%5C%3B%20x%7D)
where
is the acceleration of the car;
is the <em>final</em> velocity of the car;
is the <em>initial</em> velocity of the car; and
is the displacement of the car.
Note that <em>v</em> and <em>u</em> are velocities. Make sure that you include their signs in the calculation.
In this question,
Apply the <em>timeless</em> suvat equation:
.
The value of
is greater than zero, which is reasonable. Velocity of the car is negative, meaning that the car is moving backward. The car now moves to the back at a slower speed. Effectively it accelerates to the front. Its acceleration shall thus be positive.
Answer:
b) one-third as great.
Explanation:
As we know that same heat is supplied in this experiment
so we will have
![Q = ms\Delta T](https://tex.z-dn.net/?f=Q%20%3D%20ms%5CDelta%20T)
now we know that both are initially at same temperature
then their final temperatures are
![T_1 = 40 degree](https://tex.z-dn.net/?f=T_1%20%3D%2040%20degree)
![T_2 = 80 degree](https://tex.z-dn.net/?f=T_2%20%3D%2080%20degree)
now we have
![m_1s_1 (40 - 20) = m_2s_2(80 - 20)](https://tex.z-dn.net/?f=m_1s_1%20%2840%20-%2020%29%20%3D%20m_2s_2%2880%20-%2020%29)
so we have
![m_2s_2 = \frac{20}{60} m_1s_1](https://tex.z-dn.net/?f=m_2s_2%20%3D%20%5Cfrac%7B20%7D%7B60%7D%20m_1s_1)
so heat capacity of mystery metal is 1/3 times that of water