Answer:
(A) ratio of electric force to weight will be 
(b) Electric field will be 
Explanation:
We have given mass of bee = 100 mg = 
Charge on bee 
Electric field E = 100 N/C
Weight of the bee 
Electric force on the bee 
So the ratio of electric force on the bee and weight is 
(B) To hold the bee in air electric force must be equal to weight of bee
So 


Answer:
42.417 cm³
Explanation:
The formula to find the volume of a cone is :
V =
× π r² h
Here,
r ⇒ radius ⇒ 3 cm
h ⇒ height ⇒ 4.5 cm
<u>Let us find it now.</u>
V =
× π r² h
V =
× π × 3 × 3 × 4.5
V =
× π × 9 × 4.5
V =
× π × 9 × 4.5
V =
× π × 40.5
V =
× 3.142 × 40.5
V =
× 127.251
V = <u>42.417 cm³</u>
Answer: Concentration of H+ =10^-7; log of 10^-7=7 so pH=7
Explanation:
Answer:
v = 4.1 m/s
Explanation:
As per mechanical energy conservation law we can say that initial total gravitational potential energy of the sphere is equal to final kinetic energy of rolling
so we will say

now for pure rolling condition we know that

so we will have


now we will have



I think you are asking if fm radio waves follow a wave motion and if so, the answer is yes