Answer:
I think it has to do with Newtonian Physics
The bottom person will carry most of the weight because of the direction of the forces involved.
The strong one should be in the back to support the log the most if it is at an angle. The weaker person should be in the front to lift the log up and carry it, but not necessarily put in the same sort of strength. The person who is pushing it up will have a harder time than the person lifting it to make it easier to transport.
Note: I am not an expert at physics, this answer is based on articles on the internet
Heat energy absorbed by iron skillet=252.5 J
Explanation:
mass= 51 g
change in temperature=ΔT=25-14=11°C
specific heat of iron =0.450 J/g °C
the formula for heat is given by
Q= m C ΔT
Q=51 (0.450) (11)
Q=252.5 J
Thus heat energy absorbed=252.5 J
Answer:
A. 80 N
Explanation:
Since the uniform plank is pivoted at its center at an angle of 30 to the vertical, then it is 90° - 30° = 60° to the horizontal.
Let L be the length of the plank = 4 m, the perpendicular distance of the 4 kg mass form the pivot point is Lcos60°/2. Then the moment of the 4 kg mass about its pivot point is mgLcos60/2 where m = mass = 4 kg and g = acceleration due to gravity = 10 m/s²
Let F be the force applied at 0.5 m from the pivot point. The perpendicular distance of F from the pivot point is 0.5cos60°. Thus the moment of this force about the pivot point is F × 0.5cos60° = 0.5Fcos60°
Since both moments are the same for equilibrium,
mgLcos60/2 = 0.5Fcos60°
F = mgL/(2 × 0.5 m)
F = 4 kg × 10 m/s² × 4 m/1 m
F = 80 kgm/s²
F = 80 N
they're called stellar black holes and only very large stars can form them because they have enough mass to do so
Answer:
Because of the vibration of the string. since it is vibrating it will make the other air molecules vibrate as well and air vibrating is basically a sound wave.