Answer:
B
Explanation:
OOf we are doing this stuff atm
So if its faster at the front and slow at the back you can tell that its not slowing down because less of a force is there however at the front there is more of a force. Friction is low which means that its not makimg much contact so no sudden change of forces thats also why its B
Answer:
a = 0.7267
, acceleration is positive therefore the speed is increasing
Explanation:
The definition of acceleration is
a = dv / dt
they give us the function of speed
v = - (t-1) sin (t² / 2)
a = - sin (t²/2) - (t-1) cos (t²/2) 2t / 2
a = - sin (t²/2) - t (t-1) cos (t²/2)
the acceleration for t = 4 s
a = - sin (4²/2) - 4 (4-1) cos (4²/2)
a = -sin 8 - 12 cos 8
remember that the angles are in radians
a = 0.7267
the problem does not indicate the units, but to be correct they must be m/s²
We see that the acceleration is positive therefore the speed is increasing
The energy of a wave is directly proportional to the square of the D.Amplitude
the energy of a wave is given as
E = (0.5) (μ v t ) w² A²
where t = time
μ = mass per unit length of the string
v = wave propagation of velocity.
w = angular frequency
A = amplitude
E = energy of wave
From the equation , we see that
the energy of wave "E" is directly proportional to A².
hence the correct choice is D. Amplitude.
Speed is a SCALAR quantity and velocity is a VECTOR quantity.
VECTOR quantities have size and direction.
The two objects on the right have the same MAGNITUDE, but different VELOCITIES because they’re going in different directions.
This is shown by the MINUS sign.
Acceleration is a change in speed, so it is a SCALAR quantity.
Acceleration in the same direction as an object moving in that direction will make that object SPEED UP.
Acceleration in the opposite direction will make an object SLOW DOWN or DECELERATE.
An acceleration of ZERO will not change the velocity of an object.
Hope that helps. :)
Answer:
Clyde will provide greater impulse
Explanation:
We have given that Al exerts a force of 200 N for 5 sec
We know that impulse is given by, impulse = force ×time = 200×5 =1000 N-s
Bill exerts a force of 500 N for 2 sec
So impulse = 500×2 = 1000 N-s
Now the force exerted by Clyde 300 N for 4 sec
So impulse = 300×4 = 1200 N-s
From above calculation we can see that Clyde provide greater impulse than any other
