Answer:
3100.05 N
Explanation:
= Force on piston = 45 N
= Radius of piston
= Radius of plunger
From Pascal's law we have
The force is 3100.05 N
A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on the top. A large loa
1 answer:
Answer:
C) The speed of the freight car decreases.
Explanation:
The speed of the freight car decreases, because the sand load increases the mass of the system.
Using the conservation of linear momentum
The linear momentum m*v is an amount that must be preserved, so this equality must be satisfied before and after the sand is added to the freight car.
Subindices 1 are for before the sand is added, and subindices 2 for after the sand is added.
In this case the mass in the second moment is greater due to the mass added by the sand than the original mass
, so to maintain equality the speed in this situation must decrease.
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The four equations for acceleration are obtained from the three equations of motion and from second law of motion.
Explanation:
Acceleration is defined as the rate of change of velocity with respect to time. So the change in velocity with respect to time can be determined using the three equations of motions.
So from the first equation of motion, v = u + at , we can determine the value of acceleration if time taken, final and initial velocity is known. The equation can be re-written as
Similarly, from the second equation of motion, s = ut + 1/2 at², we can determine the equation for acceleration as
So this is second equation for acceleration.
Then from the third equation of motion,
the acceleration equation is determined as
In addition to these three equation, another equation is present to determine the acceleration with respect to force from the Newton's second law of motion. F = Mass × acceleration. From this, acceleration = Force/mass.
So, these are the four equations for acceleration.
Answer: B. CO
Explanation:
Diatomic molecules are those that are formed by two atoms of the same chemical element (homonuclear diatomic molecule) or different chemical element (heteronuclear diatomic molecule).
In this sense, oxygen is a homonuclear diatomic molecule because it is formed by two atoms of the same element () and Carbon monoxide (
) is heteronuclear diatomic molecule.
Sodium Chloride is not a diatomic molecule because is a product of ionization, but it can be diatomic in its gas phase with a polar covalent bond.