Answer:
fr = 269.3 N
Explanation:
Let's use Newton's second law, for this it is good to see the attached diagram,
X axis
fr -F2 = 0
fr = F2
Y Axis
N-W = 0
We must include the rotation balance, place the rotation point at the bottom of the ladder and take the positive counterclockwise turns.
Σ τ = 0
F2 x -W y / 2 = 0
We look for x and y with trigonometry
sin 70 = y / L
cos 70 = x / L
y = L sin70
x = L cos 70
We substitute and calculate F2
F2 L cos 70 = W L sin 70 / 2
F2 = mg/2 tan 70
F2 = 20 9.8/2 tan 70
F2 = 269.3 N
From the first equation (x axis)
fr = F2
fr = 269.3 N
Here are the answers to the given questions above.
1. The reason why a person might want to wear snowshoes if walking a distance in deep snow is that s<span>nowshoes spread the person’s weight out, snowshoes reduce the amount of pressure on a given spot, and snowshoes keep the person from sinking in the snow. So the answer is all of these.
2. </span><span>The measure of the average kinetic energy of the particles of a substance is the TEMPERATURE.
3. </span>Archimedes’ Principle helps to explain the relationship between <span>buoyancy and density.
4. The one that is </span>equal to the buoyant force of a rock placed in a beaker of water is <span>weight of the displaced fluid.
Hope these answers help.</span>
I think it’s air pressure
Answer:
a)
b)
c)
d)
e) &
f)
Explanation:
From the question we are told that:
Stretch Length
Mass
Total stretch length
a)
Generally the equation for Force F on the spring is mathematically given by
b)Generally the equation for Max Velocity of Mass on the spring is mathematically given by
Where
A=Amplitude
And
Therefore
c)
Generally the equation for Max Acceleration of Mass on the spring is mathematically given by
d)
Generally the equation for Total mechanical energy of Mass on the spring is mathematically given by
e)
Generally the equation for the period T is mathematically given by
Generally the equation for the Frequency is mathematically given by
f)
Generally the Equation of time-dependent vertical position of the mass is mathematically given by
Where
'= signify order of differentiation
Answer:
0 N
Explanation:
Net force = mass × acceleration
∑F = ma
The velocity is constant, so the acceleration is 0. Therefore, the net force is 0.