Answer:
9 m/s
Explanation:
mass of cannon, M = 100 kg
mass of cannon ball, m = 10 kg
velocity of cannon ball, v = 90 m/s
Let the recoil velocity of cannon is V.
Us ethe conservation of linear momentum, as no external force is acting on the system, so the linear momentum of the system is conserved.
Momentum before the firing = momentum after the firing
M x 0 + m x 0 = M x V + m x v
0 = 100 x V + 10 x 90
V = - 9 m/s
Thus, the recoil velocity of cannon is 9 m/s.
Answer:
The magnitude of the magnetic field is 0.83 T
Explanation:
Given :
Speed of electron inside television tube (<em>v</em>) = ×
Radius of electron moving path () = ×
According lorentz force in magnetic field is,
∴ ×
Where, = charge of electron, = speed of electron, = magnetic field and
= force on electron.
when electron is moving in circular orbit the force is given by,
∴
so we equate above both equation.
∴ ×
∴
∴ ××××××
∴ 0.83 Tesla
Therefore, the magnitude of the magnetic field is 0.83 T.
Answer:
The actual elevation angle is 12.87 degrees
Explanation:
In the attachment you can clearly see the situation. The angle of elevation as seen for the scuba diver is shown in magenta, we conclude that .
Using Snell's Law we can write:
,
Let's approximate the index of refraction of the air (medium 1 in the picture) to 1.
We thus have:
. Calling the actual angle of elevation, we get from the picture that
Answer:
They are all types of motion energy.
Answer:
45.1 m/s
Explanation:
use the equation v = u + at
substitute the values v = 0 + 9.8×4.6
v = 45.08
round to 3 s.f v = 45.1 m/s