Answer:
Explanation:
According to the Stefan-Boltzmann law for real radiating bodies:
(1)
Where:
is the energy radiated (in Watts)
is the Stefan-Boltzmann's constant.
is the Surface area of the body
is the effective temperature of the body (its surface absolute temperature) in Kelvin
is the body's emissivity
On the other hand, we are told the human body is roughly approximated to a cylinder of length and circumference .
The circumference of a circle is: where is the radius. Hence .
Now we have to input this value for in the Area of a cylinder formula:
(2)
Substituting (2) in (1):
(3)
Finally:
Answer:
Workdone = 1476 Nm
Explanation:
Given the following data;
Force = 164 N
Mass = 55kg
Distance = 9 m
To find the work done;
Workdone = force * distance
Workdone = 164 * 9
Workdone = 1476 Nm
Therefore, the work done by the force on the television set is 1476 Nm.
It’s D the time period within pendulums are constant, distance is always measured with kilometers within cities and basic unit is always seconds.
Answer:
The player's speed is 1.93 m/s.
Explanation:
Given that,
Mass of football = 71.5 kg
Speed = 2.00 m/s
Mass of football = 0.470 Kg
Speed = 12.5 m/s
We need to calculate the initial momentum of the football player and ball
Put the value into the formula
We need to calculate the final momentum of the system
Put the value into the formula
We need to calculate the relative to the ground
Using conservation of momentum
Put the value into the formula
Hence, The player's speed is 1.93 m/s.