A boy and his skateboard have a combined mass of 65 kg. What is the speed of the boy and skateboard if they have a momentum of 2
2 answers:
Answer : Speed is 4.2 m/s
Explanation :
The combined mass of the boy and the skateboard is 65 kg
The momentum of the boy and the skateboard is 275 kg m/s
The momentum is given by:
p = m v
where m is the combined mass of boy and the skateboard.
v is the speed of both boy and the skateboard.
The speed of the boy and the skateboard is 4.2 m/s
So, the correct option is (C).
Hence, this is the required solution.
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Question:
A point charge of -2.14uC is located in the center of a spherical cavity of radius 6.55cm inside an insulating spherical charged solid. The charge density in the solid is 7.35×10−4 C/m^3.
a) Calculate the magnitude of the electric field inside the solid at a distance of 9.50cm from the center of the cavity.
Express your answer using two significant figures.
Answer:
The magnitude of the electric field inside the solid at a distance of 9.50cm from the center of the cavity
Explanation:
A point charge ,q = is located in the center of a spherical cavity of radius ,
m inside an insulating spherical charged solid.
The charge density in the solid , d =
Distance from the center of the cavity,R =
Volume of shell of charge= V =
Charge on the shell ,Q =
Electric field at m due to shell
E1 =
Electric field at due to 'q' at center
E2 =
The magnitude of the electric field inside the solid at a distance of 9.50cm from the center of the cavity
= E2- E1