Pregunta completa:
Un barco va a una velocidad de 45 ml/h, luego el capitán ordena acelerar hasta que la velocidad hasta que la velocidad sea de 60 mll/h. si la operación dura 30 minutos.
A cual fue la aceleracion?
B qué distancia recorre?
Responder:
30 millas / hora
26.25 mi
Explicación:
Dado que :
Velocidad inicial, u = 45 mi / hr
Velocidad final, v = 60 mi / hr
Tiempo, t = 30 minutos = 30/60 = 0,5 h
Aceleración, a = cambio de velocidad con el tiempo;
a = (v - u) / t
a = (60 - 45) / 0,5
a = 15 / 0,5
a = 30 millas / h²
Recorrido de distancia, S
S = ut + 0.5at²
S = 45 (0,5) + 0,5 (30) (0,5²)
S = 22,5 + 3,75
S = 26,25 millas
I would say a short person with muscles considering they are closer to the ground, but they may not be able to build up as much force in such a short time compared to the tall person.
The correct answer would be a) head of state.
Chief executives carry out executive orders.
The commander in chief carries out military orders and commands military forces. Leaders of foreign policy deal enforce international policies.
The energy that the man has gained in being lifted is 3000J which is in the form of potential energy.
<u>Explanation:</u>
Given:
Work done, W = 3000J
Height, h = 2.5m
Time, t = 0.4 seconds
Energy gained = ?
As the man gets lifted, it gains potential energy.
Potential energy will be equal to the work done by the elevator.
We know,
potential energy = mgh
Thus, the energy that the man has gained in being lifted is 3000J which is in the form of potential energy.
Answer:
a =1.61 × 10⁻⁶ m/s²
Explanation:
given,
length of minute hand = 0.53 m
length of hour hand = 0.26 m
the time taken by the minute hand to complete one revolution is T=3600 s
the angular frequency is
the acceleration is
a =1.61 × 10⁻⁶ m/s²
