In the diagram, the ship send sound(?) waves to the water, to determine if there is anything there. If there is something like a sunken ship shown in the diagram, the waves return in a shorter time hence you can understand if theres something or now. This is the principle of radars and sonars.
a. 4.52 m/s south
Velocity is a vector, whose magnitude is defined as the ratio between the displacement of the object and the time taken for the displacement to occur:
where
d is the displacement
t is the time
Velocity is a vector, so it also has a direction, which corresponds to that of the displacement.
For the ball in this problem,
d = 9.5 m south
t = 2.1 s
Substituting, we find:
and the directiion is the same as the displacement (south).
b. 4.52 m/s north
For this part, we must keep in mind that the speed is the magnitude of the velocity; however, speed is a scalar, so it does not have a direction.
Here we are told that the tennis ball travels at constant speed, so on its way back from Liam to Katie the ball's velocity is still the same as before, therefore
However, this time the direction is opposite to before, since the ball is travelling in the opposite direction.
Therefore, the ball's velocity when Liam returns Katie's service is
4.52 m/s north
Given
<span>u→Initial velocity of the spaceship=58<span>ms</span></span>
<span>v→after t= 12s ,Final velocity of the spaceship =153<span>ms</span></span>
The spaceship moving with uniform acceleration
<span><span>s→The distance covered in t s=<span>12</span><span>(u+v)</span>×t=<span>12</span><span>(58+153)</span>×12</span><span>=1266<span>m</span></span></span>
Based on Patient B's history "nerve damage" diagnosis is most logical.
<u>Answer:</u> Option C
<u>Explanation:</u>
Signs rely on which nerve is harmed, and whether one nerve, several nerves or the entire body is affected by the damage. In the arms and legs tingling or burning can be an early indicator of nerve damage. Disruption to the nerves can make regulation of the muscles more difficult. It can also cause frailty.
A test of nerve conduction velocity (NCV) also termed a study of nerve conduction initiatives how quickly an electrical impulse goes through the nerve. NCV can recognize any real harm to the nerves. The nerve is stimulated during the test, generally with patches of electrodes fixed to one's skin.
Answer:
C. The net force applied to the ball is zero.
Explanation:
From Newton's second law of motion;
F = ma
Where F is the force on an object, m is its mass and a is its acceleration.
Therefore, the force on an object is a product of its mass and acceleration as it travel from one point to another.
Since acceleration relates to the rate of change in velocity to time. Then when the object moves at uniform velocity (especially along a straight path), its acceleration is zero.
So that;
F = m x 0
= 0
No force is applied on the object.
Therefore for the ball in the given question, the net force applied to the ball is zero because it rolls with constant speed along a straight path.