Answer:
The work done by the frictional force is 600J.
Explanation:
The work done by the frictional force is
.
Now, and
; therefore,
Hence, the work done by friction is 660J.
All the electrons within a magnetic substance are oriented
1 answer:
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The volume of the room is the product of its dimensions:
Now, from the equation
where d is the density, m is the mass and V is the volume, we deduce
So, multiply the density and the volume to get the mass of air in the room.
The stopping distance is 45.0 m
Explanation:
First of all, we find the acceleration of the truck, by using Newton's second law:
where
is the net force on the truck
is the mass of the truck
a is its acceleration
Solving for a,
where the negative sign means the acceleration is opposite to the direction of motion.
Now, since the motion of the truck is at constant acceleration, we can apply the following suvat equation:
where
v = 0 is the final velocity of the truck
u = 22.2 m/s is the initial velocity
is the acceleration
s is the stopping distance
And solving for s,
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