Which of the following units could be used for the average speed of an object? A. kilometers per hour (km/hr) B. miles per hour
1 answer:
Answer : The correct option is, (D) all of these
Explanation:
Average speed : It is defined as the ratio total distance to total time. It is a scalar quantity that means it is defined by the magnitude only.
Formula used :
The common units of average speed are miles per hour (mph), kilometers per hour (kph), meters per second (m/s), or feet per second (ft/s).
The S.I unit of average speed is meter/second (m/s).
Hence, all of the units could be used for the average speed of an object.
You might be interested in
The electric field intensity generated by a single point charge is given by
where
k is the Coulomb's constant
q is the charge
r is the distance from the charge
In this problem, the charge is and we are asked to calculate the field at distance
, so the electric field is
Answer:
a.
b.
Explanation:
#Apply surface charge density, electric field, and Gauss law to solve:
a. Surface charge density is defined as charge per area denoted as
, and the strength of the electric field outside the sphere
Using Gauss Law, total electric flux out of a closed surface is equal to the total charge enclosed divided by the permittivity.
#surface charge outside sphere.
Hence, the new charge density on the outside of the sphere is
b. The strength of the electric field just outside the sphere is calculated as:
From a above, we know the new surface charge to be ,
Hence, the strength of the electric field just outside the sphere is