If the canyon below is 100.0 m deep, the rocket travels from the edge of
the cliff 226m in the horizontal direction.
<span>When </span>air resistance<span> acts, acceleration during a fall will be less
than g because </span>air resistance affects<span> the motion of the falling objects by slowing it
down. </span>Air resistance<span> depends on two important factors -
the speed of the object and its urface area.
Increasing the surface area<span> of
an object decreases its speed.</span></span>
The correct answer between all
the choices given is the first choice or letter A. I am hoping that this answer
has satisfied your query and it will be able to help you in your endeavor, and
if you would like, feel free to ask another question.
The force of a test charge would be doubled if the electric field is doubled.
Answer: Option A
<u>Explanation:</u>
Electric field is the region or range up to which a charge particle will have its influence of electric energy on another charged particles. So the experienced force by the test charge up to a certain range is defined as the electric field of that charged particle.
This means that the electric field strength is inversely proportionate to the test charge and directly proportionate to the force acting on the test charge. As
,

So, force will be product of electric field strength with test charge. Thus,

So, if there is increase in the electric field, then there will be increase in the force of the test charge. Thus, if the electric field is doubled thereby the force of a test charge will also be doubled.
Answer:
Because the molecules are not packed together as much than the air, in a fixed volume of helium there are fewer particles than in the same fixed volume of air.
This means that the mass of the fixed volume of helium is smaller than the one of air, and then the density, defined as mass/volume, is also smaller.
This is why the balloon floats, because the air is denser, it tries to go down, pushing the ballon upside.
The case is similar for a piece of metal in water, as the metal is way denser than the water, the metal will sink, but for something not as dense, like a balloon with air, the balloon will remain in the surface of the water.
Explanation:
The peak emf in an AC generator is given by :

Here,
N is number of turns in the generator
A is area of the coils
B is magnetic field
is angular frequency
It is clear that the peak emf in an ac generator depends on :
- The number of turns in the generator
- Area of coils
- Magnetic field