Answer:
1.
2.
3.
Explanation:
Use conservation of momentum:
1.
The expression for the magnitude of the BB's velocity is
v2i = 0 m/s, solve for v1f
2.
Now replacing numeric to find the value
3.
Now is doesn't exist the box the velocity will be
v1f = v2f = vf
Conservation of Momentum
Answer:
The maximum height reached by the ball is 20 meters
Explanation:
Given that,
Height, h = 10 m
Potential energy at the height of 10 m,
The ball is moving upward with a kinetic energy of 50 Joules
Let h is the maximum height reached by the ball. At a height of 10 meters above the ground, the energy is given by :
mg = 5 N
At this point, total energy will be 100 J. We know that the velocity is zero at maximum height. So, the ball possess only potential energy. it is given by :
h = 20 meters
So, the maximum height reached by the ball is 20 meters. Hence, this is the required solution.
Principle: Pythagorean theorem
Given:
Let a = boat velocity = 25 miles per hour
b = river velocity = 10 miles per hour
Required: c = actual velocity
Solution:
c^2 = a^2 + b^2
c^2 = (25)^2 + (10)^2
c^2 = 725
(c^2)^0.5 = (725)^0.5
c = 26.93 miles per hour
<em>ANSWER: Actual boat velocity is 26.93 miles per hour</em>
Answer:
Puesto que la energia cinética traslacional es mucho mayor que la capacidad del chaleco antibalas, la bala atravesaría el chaleco antibalas.
Explanation:
Un chaleco antibalas soporta el disparo de una bala disipando la energía de esta última a través de su propio material. Si sabemos que el chaleco antibalas soporta 120 joules de energía, cabe saber si la energía cinética traslacional es igual o inferior a ese límite, significando que la bala no atravesaría el chaleco.
La energía cinética traslacional de la bala (), in joules, queda expresada con la siguiente fórmula:
(1)
Donde:
- Masa de la bala, en kilogramos.
- Rapidez de la bala, en metros por segundo.
Si sabemos que y , entonces la energía cinética traslacional de la bala es:
Puesto que la energia cinética traslacional es mucho mayor que la capacidad del chaleco antibalas, la bala atravesaría el chaleco antibalas.
The formula to find the speed of a wave
speed = wavelength x frequency
speed and frequency are directly proportional so as one increases then the other one will increase as well. in this case as the frequency increases then the speed of the wave will also increase.
hope this helps :)