Please answer and fast i am in a test
2 answers:
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Answer:
B) Tommy had a positive acceleration between noon and 12:30 pm.
Explanation:
Acceleration is defined as the rate of change of velocity:
where
v is the final velocity
u is the initial velocity
t is the time
In the problem,
- At noon, Tommy is walking at a velocity of 4 mi/h
- At 12.30 pm, Tommy is walking at a velocity of 6 mi/h
- A time of half an hour (0.5 h) passed between the two moments
So Tommy's acceleration is
and the acceleration is positive, since the velocity has increased.
Answer:
Explanation:
e = Charge of electron =
n = Electron concentration =
= Drift veloctiy = 113 m/s
E = Electric field = 510 V/m
Electron mobility is given by
Conductivity is given by
The conductivity of this material is