Define
= unit vector due east.
= unit vector due north.
Therefore
Part (a)
Because
, therefore
B² + (-2.5)² = 4²
B² = 9.75
B = 3.1225 km
Answer:
Part (b)
As a positive angle (counterclockwise) measured relative to the southern direction, the direction of
is
Answer: 53°, measured counterclockwise from the south.
Part (c)
If
, then
(-B)²+(-2.5)² = 4²
B² = 16 - 6.25
B = 3.1225 km
Answer:
Part (d)
The direction of
relative to the southern direction is
tan⁻¹ (-3.1225/-2.5) = 51.3°, measured clockwise from south.
Answer: 51.3° measured clockwise from the south.
Answer:
A. 600 N
Explanation:
the weight of your friend is 60×100=600N
Explanation:
pressure=force/area
force=mass x acceleration
area=length x width
force=M x LT^-2
area=L^2
=ML^-1T^-2
The formula you use is Density = (mass) / (volume) .
The calculation for this particular object is
Density = (68.895 g) / (23.5 mL - 14.7 mL)
Density = (68.895 g) / (8.8 mL)
<em>Density = 7.8 g/mL</em>