Answer:
B
Explanation:
Speed is the magnitude of the velocity vector, so it can never be negative.
 
        
             
        
        
        
Answer:
A) 0.50 mV
Explanation:
In this problem, we can think the wings of the bird as a metal rod moving across a magnetic field. So, and emf will be induced into the wings of the bird, according to the formula:

where
 is the strength of the magnetic field
 is the strength of the magnetic field
v = 13 m/s is the speed of the bird
L = 1.2 m is the wingspan of the bird
 is the angle between the direction of motion and the direction of the magnetic field
 is the angle between the direction of motion and the direction of the magnetic field
Substituting numbers into the formula, we find

 
        
             
        
        
        
<span>Given:
3,500 kilometers
Find:</span>
 
Years for two continents to collide = ?
 
<span>Solution:
We know that </span>typical motions of one plate relative to another
are 1 centimeter per year.
So first, we convert 3,500 km to cm.<span>
</span><span>
</span>
The solution would be like this for this specific problem:
 
1 km = 100,000 cm
3,500 km x 100,000 = 350,000,000 cm
Since we know that 1 cm = 1 year, then that means
350,000,000 cm is equivalent to 350,000,000 years.
 
Therefore, it would take 350 million years for two continents
that are 3500 kilometers apart to collide.
<span>
To add, </span>a phenomenon of the plate tectonics of Earth that occurs at
convergent boundaries is called the continental collision.
 
        
             
        
        
        
The stopwatch will be the most useful in determining the kinetic energy of a 50 g battery- powered car traveling a distance of 10 m. 
<h3>What is kinetic energy?</h3>
Kinetic energy is the energy of a body possessed due to motion. 
This means that for an object to possess kinetic energy, it must be in motion. 
The kinetic energy is measured in Joules, which is a product of the mass of the substance and the time taken to travel a distance. 
A stopwatch is an instrument used to measure time as one of the components of kinetic energy. 
Therefore, the stopwatch will be the most useful in determining the kinetic energy of a 50 g battery- powered car traveling a distance of 10 m.
Learn more about kinetic energy at: brainly.com/question/12669551