Answer:
P car = 1500×400/12= 50,000kgm/s
P electron= 9.1×3.5×10^(-31+6)
= 31.85×10^-25 kgm/s
Q=cm x change in t
Q= (390 J/kg C) x (0.045 kg) x (40.0 C)
Q= 702 J
Answer:
the weight of astronauts on earth is greater than his weight on d moon
Explanation:
due to the greater gravitational pull in earth the weight seems to me more
but for the moon where there is less gravity
its weight will be less causing slight flotation
Answer:the hose would explode and you would mess the water system out
Explanation:
Answer: 20580 Joules of work is done by the firefighter.
Explanation:
Work done is defined as the force times distance travelled.
work=
Given:
mass= 75 kg
acceleration due to gravity =
h= height = 28 m
Putting in the values we get,
work=
Thus 20580 Joules of work is done by the firefighter.