Answer: D
Explanation:
The net force acting on an object is equal to the resultant of the forces acting on the object itself.
In object A), we see that the vertical forces are balanced (+3 N upward and -3 N downward), as well as the horizontal forces (+5 N right and -5 N left), so the net force is zero.
In object B), the vertical forces are balanced (+3 N upward and -3 N downward). The horizontal force (5 N left) is not balanced, so it produces a net force, however this net force is towards left.
In object C), there are only two vertical forces which are balanced (+20 N upward and -20 N downward), so the net force is zero.
In object D), there are only two vertical forces which are not balanced, and the net force is +40 N (upward) - 25 N (downward) = +15 N upward.
Answer:
Explanation:
The motion of an object in free fall is a uniformly accelerated motion, so we can analyze it using the following suvat equation:
where, taking downward as positive direction:
s is the vertical displacement
u is the initial velocity
t is the time of flight
g is the acceleration of gravity
For the ball dropped in this problem,
s = 10 m
t = 5.0 s
u = 0
Therefore, solving the equation for g, we find the acceleration due to gravity:
Answer: The answer is A just answered it
Explanation:
lets assume
L = length of the object = 5 cm
h = height of the object = 3 cm
w = width of the object = 2 cm
V = Volume of the object
Since the dimensions of object suggest it to be a cuboid
Volume of the object is given as
V = L w h
inserting the values
V = 5 x 3 x 2
V = 30 cm³
m = mass of the object given = 10 g
ρ = density of the object = ?
density of the object is given as
density of object = mass of object / Volume of object
ρ = m/V
inserting the values
ρ = 10/30
ρ = 0.33 g/cm³