Answer:
only ten meters north from starting point
Explanation:
 
        
             
        
        
        
Answer:
he failed thousands of times
Explanation:
There is no known number for his failings. Edison may have failed in many of his experiments and in his schooling, but he had something better working in his favor. He had great determination and persistence.
He failed thousands of times in an attempt to develop an electric light, the great Edison simply viewed each unsuccessful experiment as the elimination of a solution that wouldn’t work, thereby moving him that much closer to a successful solution. 
 
        
             
        
        
        
Answer:
They have the same rate of motion.
Explanation:
Electromagnetic radiation is a type of energy that is commonly known as light. Generally, light travels in waves, and all electromagnetic radiation travels at the same speed, which is about 3.0 × 108 ms− 1 through a vacuum.
 
        
             
        
        
        
Answer:
Option D) the ratio of the force exerted by the machine to the force applied
Explanation:
The measure of the amplification of the force applied to a mechanical device or a measure of the force exerted by a mechanical device.
The input of the tool or machine is then conserved and the forces are trade off against motion to achieve a required level of amplification.
Therefore, only option c. complies with it.
 
        
             
        
        
        
Answer:
The reading of the experiment made in air is 50 g more than the reading of the measurement made in water.
Explanation:
Knowing that the density of lead is  and the volume, we can calculate the true weight of the piece of lead:
 and the volume, we can calculate the true weight of the piece of lead:

When the experiment is done in air, we can discard buoyancy force (due to different densities) made by air because it's negligible and the measured weight is approximately the same as the true weight.
When it is done in water, the effect of buoyancy force (force made by the displaced water) is no longer negligible, so we have to take it into account.
Knowing that the density of water is 1 g per cubic centimeter, and that the volume displaced is equal to the piece of lead (because of its much higher density, the piece of lead sinks), we can know that the buoyancy force made by water is 50 g, opposite to the weight of the lead.

Now that we have the two measurements, we can calculate the difference:

The reading of the experiment made in air is 50 g more than the reading of the measurement made in water.