Answer:
24.30 m
Explanation:
v(final)=v(initial)+at
0 m/s= 9 m/s +a(3.2s)
a=-2.81 m/s^2
delta x= vt+ (1/2)at^2
=(9 m/s * 3.2 s)+ (.5* -2.81 m/s^2 * 3.2s)
=24.30 m
Answer:
B
Explanation:
The impulse experienced by an object is the force•time.
B = µo*N*I/2r
So B = 4πx10^-7*150*1.6/2*3.5 = 4.31x10^-5T
The distance, van travels while coming to rest after brake applied is 6.4m
<h3>What is Work energy theorem?</h3>
It states that the Work done in moving a body is equal to the change in kinetic energy of the body
Given is a delivery van whose kinetic energy K.E = 80000J and the force applied to brake F = 12500 N.
The brakes are applied to stop the van, so, final velocity is zero. Then, change in kinetic energy will be
According to work energy theorem, work done is
W = ΔK.E = K.Ef - K.Ei
W = - 80000J
Work done is also defined as the product of force applied and the distance it travelled.
W = Fs
80000 = 12500 x s
s = 6.4 m
Thus, the distance, van travels while coming to rest after brake applied is 6.4m
Learn more about work energy theorem.
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Answer:
a) τ =0, b) τ = 4.0 N m
, c) τ = 2 / √t, d) τ = 2 t N m
Explanation:
Angular momentum and torque are related by the equation.
τ =dL / dt
Bold indicates vectors, as time is a scalar, the direction of L is the same as the direction of the torque
Let's analyze each case presented
a) L = 4.0 kg m2 / s
As L is constant
dL / dt = 0
τ= 0
b) L = 4 t
dL / dt = 4
τ = 4.0 N m
c) L = 4 √ t
dL / dt = 4 ½ 1/√t = 2 / √ t
τ = 2 / √ t
d) L = 4 t²
dL / dt = 4 (2t)
τ = 2 t N m