Answer:
Explanation:
Draw a free body diagram for the painter. There are three forces acting on him. The tension in the rope pulling him up, the normal force of the chair pushing him up, and gravity pulling him down.
Apply Newton's second law:
∑F = ma
T + N - W = ma
Since the painter is at rest, a = 0.
T + N - W = 0
T = W - N
T = Mg - N
Now draw a free body diagram of the chair. The chair has three forces acting on it also. The tension in the rope pulling it up, the normal force pushing down, and gravity pulling down.
Newton's second law for the chair:
∑F = ma
T - W - N = ma
Since the chair is also not accelerating, a = 0:
T - W - N = 0
T = W + N
T = mg + N
Now we have two equations and two variables. If we add the equations together, we can eliminate N:
2T = Mg + mg
2T = (M + m) g
T = (M + m) g / 2
Given that M = 55 kg, m = 10 kg, and g = 9.8 m/s²:
T = (55 + 10) (9.8) / 2
T = 318.5 N
If we round to two sig-figs, the tension in the rope is 320 N.
Answer:
Explanation:
h = Planck's Constant = 
A = Area = 1 m²
Distance between Earth and Sun = 
= Wavelength = 580 nm
c = Speed of light = 
Power output of Sun
Intensity
Energy of photons
Number of photons
The number of photons are
I’d say d
hopes this helps
Answer:
ow much work was done? W = F xD. IN X 2m = 2;. 2. A force of 15 newtons is ... 3. It took 50 joules to push a chair 5 meters across the floor. With what force was ... was done. How far was the rock lifted? W=FXD. D=1500 = 1.5m. Answer: :.5m ... A young man exerted a force of 9,000 newtons on a stalled car, but he was.
Explanation:
