To have a uniform field. The field is the voltage between the plates divided by the distance between the plates. If the distance varies so would the field between them.
Answer:
Explanation:
From the given information:
radius = 15 m
Time T = 23 s
a) Speed (v) = 

v = 4.10 m/s
b) The magnitude of the acceleration is:

a = 1.12 m/s²
c) True weight = mg
Apparent weight = normal force
From the top;
the normal force = upward direction,
weight is downward as well as the acceleration.
true weight - normal force = ma
apparent weight =mg - ma


= 0.886 m/s²
d)
From the bottom;
acceleration is upward, so:
apparent weight - true weight = ma
apparent weight = true weight + ma



= 1.114 m/s²
20N•m or 20J. Work is equal to force•distance, and 5N•4m is 20N•m, or J
The specific heat of the metal is 
Explanation:
When a sample of a material absorbs energy, its temperature increases according to the equation

where
Q is the amount of energy supplied to the sample
m is the mass of the sample
Cs is its specific heat capacity
is the increase in temperature
In this problem,
m = 50.0 g
Q = 220.0 J

Solving for C_s, we find the specific heat capacity:

Learn more about specific heat capacity:
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