If the net force on a block is zero, the block will move at constant velocity
Explanation:
We can answer this question by applying Newton's second law of motion, which states that the net force on an object is equal to the product between its mass and its acceleration:
(1)
where
is the net force on the object
m is its mass
a is its acceleration
In this problem, we have a block, and the net force on it is zero:
According to eq.(1), this also implies that
So, the acceleration of the block is zero.
However, acceleration is the rate of change of velocity of a body:
where 
is the change in velocity in a time of 
. Since the acceleration is zero, this means that 
, and therefore the velocity of the object is constant.
Learn more about Newton's second law:
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Answer:
Explanation:
Let the frictional force required be f .
frictional force is responsible in creating rotational motion in the cylinder.
torque created by frictional force = f R
if angular acceleration be α
α = f R / I , I is moment of inertia of cylinder .
α = a / R , a is linear acceleration.
f R / I = a / R
a = f R² / I
linear acceleration a of cylinder down the slope
ma = mgsinθ - f , ( f force is acting upwards and mgsinθ is acting downwards )
mf R² / I = mgsinθ -f
f ( m R² / I + 1) = mgsinθ
f = mgsinθ / ( m R² / I + 1)
= mgsinθ / ( m R² / mk² + 1) , k is radius of gyration of cylinder.
= mgsinθ / ( R² / k² + 1)
Putting the given values
f = Mgsinβ /( R² / k² + 1)
for cylinder , R² / k² = 2
f = Mgsinβ /3
Answer:
In marine ecosystems, climate change is associated with concurrent shifts in temperature, circulation, stratification, nutrient input, oxygen content, and ocean acidification. There are also strong linkages between climate and species distributions, phenology, and demography.
Explanation:
Mark her brainliest
Answer:
Explanation:
Given
mass of stone
=0.250 kg
Let initial velocity with which it is thrown upward is u
therefore after time t it's velocity is zero at highest point
t=
where g= gravity at earth
therefore 
-------1
Now same thing is done in Planet X where gravity is g'
therefore time taken by stone to reach surface is
-------2
Divide 1 & 2
=
=
g'=
So, using the periodic table of elements, we know that the atomic number of sulfur is 16, which stands for the number of protons/electrons in the atom. Since the mass number, in this case is 34, is the sum of protons and neutrons, all we have to do is subtract 16 from 34, which will give us 18, the number of neutrons for this isotope of sulfur. :)
