Answer:
(a) 1782 Hz (b) 2178 Hz
Explanation:
The predominant frequency =1980 Hz
The speed of the police car =34.3 m/sec
The speed of sound in air =343 m/sec
(a) When the car moves towards you
According to Doppler's effect
(b) When the car moves away from you
Answer:
True
Explanation:
Law of Conservation of Energy, states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another.
m = mass of the object lifted by you = 14 kg
g = acceleration due to gravity by earth on the object being lifted = 9.8 m/s²
h = height to which the object is lifted slowly = 0.80 m
W = Work done in lifting the object
work done in lifting the object is same as the gravitational potential energy gained by the object. hence
Work done = Gravitation potential energy of object
W = m g h
inserting the values
W = (14) (9.8) (0.80)
W = 109.8 J
Answer:
510448 Joules
102089.6 J
13.61194 min
Explanation:
The energy in Joules is 510448 Joules.
20% of energy
The energy is 102089.6 J
Power is given by
The number of minutes is 13.61194 min
An average person consumes around 2000-2500 kcal
This is done in 13.61194 min
In one hour
So, it is easy to consume the calories.
Answer:
The value is
Explanation:
From the question we are told that
The current is
The radius is
The length of the wire is \
The resistance is
The outer surface temperature is
The average thermal conductivity is
Generally the heat generated in the stainless steel wire is mathematically represented as
=>
=>
Generally the middle temperature is mathematically represented as