Answer:
The quantity which can be measured is called physical quantity.
Answer:
47 m
Explanation:
Time of flight of stone thrown up = time of fall of stone dropped down.
Time of flight = 2u /g
where u is initial velocity and g is acceleration due to gravity.
= 2 x 15.2 / 9.8
=3.10 s.
For fall of second stone
time of fall t = 3.1 s
Height h = ?
h = ut + .5 g t²
= 0 + .5 x 9.8 x 3.1 x 3.1
= 47 m
Answer: 134.23g at 0° (horizontal) and 77.5g at 90° (vertical).
Explanation:
1) Since the mass of <span>155 g is suspended at 210 degrees, you need to find the components of its weight on the orthogonal coordinate system (0° and 90°).
</span>
<span>2) You do that using the trignometric ratios sine and cosine.
</span>
<span>Weight is mass × g.
</span>
<span>Weight of the object = 155g × g
</span>
<span>Angle, α = 210°
</span>
<span>Horizontal component (0°)
</span>
<span>cosα = horizontal / hypotenuse ⇒ horizontal = hypotenuse × cosα
</span>
⇒ horizontal = 155g × g × cos(210°) = - 134.23g × g
Vertical component
sinα = vertical / hypotenuse ⇒ vertical = hypotenuse × sinα
⇒ vertical = 155g × g × sin(210°) = -77.5g × g
3) Conclusion:
Therefore, the masses that must be suspended to balance the forces of the 155g mass are 134.23g at 0° (horizontal) and 77.5g at 90° (vertical).
Hi there!
We can use the following equation for constant velocity:
d = displacement (m)
v = velocity (m/s)
t = time (s)
Plug in the givens:
If velocity is constant, then the object is moving
at constant speed in a straight line.
