Answer:The reading on the scale is 64.76kg
Explanation:
According to Newton's 3rd law,when a person exerts a force on a plane,the plane simultaneously exerts a force equal in magnitude and opposite.
Given: mass=70kg ,alpha= 22.3°
Mg=mg×cos alpha= 70kg× cos22.3°=
70× 0.9252= 64.76kg
The reading on the scale is 64.76kg
We can approach this in another way.
We know that sin(∅) = height / hypotenuse.
Thus, for x, height is 1 and hypotenuse is 3. Using Pythagoras theorem,
3² = 1² + b²
b = √8
cos(x) = b/hypotenuse
cos(x) = √8 / 3
Now, lets consider y:
sec(y) = 1 / cos(y) = 1 / base / hypotenuse = hypotenuse / base
The hypotenuse is 25 and the base is 24. We again apply Pythagoras theorem to find the third side, which works out to be:
height = 7
sin(y) = height / hypotenuse
sin(y) = 7/25
Now, sin(x + y) =
sin(x)cos(y) + sin(y)cos(x)
= (1/3)(24/25) + (√8 / 3)(7/25)
= 8/25 + 7√8/75
= (24 + 14√2) / 75
Answer:
yes
Explanation:
when we throw a ball upwards, it will eventually come back to us because of force.
Answer:
yes
Explanation:
<em>A critical period?
</em>
<em>A.begins and ends abruptly
</em>
<em>B.begins and ends gradually
</em>
<em>C.is unaffected by stimuli
</em>
<em>D.is unlikely to impact development</em>
<em>correct answer (A.begins and ends abruptly
)</em>