Total mechanical energy: D) 2800 J
Explanation:
The total mechanical energy of an object is given by
where:
is the kinetic energy of the object, which is the energy possessed by the object due to its motion, where
m = mass of the object
v = speed
And
is the gravitational potential energy of the object, the energy possessed by the object due to its location, where
is the acceleration due to gravity
h is the height of the object above the ground
For the body in this problem, we have:
m = 4.0 kg
v = 20 m/s
h = 50 m
Substituting, we find its total energy:
Learn more about kinetic and potential energy:
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D. if supply drops the population will because lack of resources
A 500 watt vacuum cleaner is plugged into a 120 volt outlet and used for 30 minuets. How much current runs through the vacuum?
In this case 4.2 amps of current are running through the vacuum.
p=vi
Answer:
D
Explanation:
power is the work done per time taken,
Work done is measured in Joules, Nm
time is measured is seconds s
(Nm)/s
Answer:
Explanation:
Temperature is directly proportional to thermal energy of a body.
Thermal energy is one of the numerous forms of kinetic energy which dependent on the motions of the particles in a body.
When the temperature of a body increases, it possess more kinetic thermal energy. In this case, the molecules of the body gains more energy and begins to vibrate until they attain maximum kinetic energy.
The higher the temperature the more the kinetic energy.