Answer:
c. 716, 800 J
Explanation:
t = Time taken
u = Initial velocity = 32 m/s
v = Final velocity = 0
s = Displacement = 60 m
a = Acceleration
m = Mass of car = 1400 kg
Work done is given by
The amount of work done to stop the car is 716800 J
#82
here we know that
acceleration = 2 m/s/s
time = 5 s
initial speed = 4 m/s
now we can use kinematics to find the final speed
So correct answer will be option D)
#83
here we know that
acceleration = 3 m/s/s
time = 4 s
initial speed = 5 m/s
now we can use kinematics to find the final speed
So correct answer will be option C)
#84
here we know that
acceleration = 7 m/s/s
time = 3 s
initial speed = 8 m/s
now we can use kinematics to find the final speed
So correct answer will be option C)
- (a) Maximum emf: 90 V (2 sig. fig.)
- (b) Emf at π/32 s: 85 V.
- (c) t = 0.125 s.
<h3>Explanation</h3><h3>(a)</h3>
The maximum emf in the coil depends on
- the maximum flux linkage through the coil, and
- the angular velocity of the coil.
Maximum flux linkage in the coil:
.
Frequency of the rotation:
.
Angular velocity of the coil:
.
Maximum emf in the coil:
.
<h3>(b)</h3>
Emf varies over time. The trend of change in emf over time resembles the shape of either a sine wave or a cosine wave since the coil rotates at a constant angular speed. The question states that emf is "zero at t = 0." As a result, a sine wave will be the most appropriate here since .
.
Make sure that your calculator is in the radian mode.
.
<h3>(c)</h3>
Consider the shape of a sine wave. The value of varies between -1 and 1 as the value of changes. The value of at time depends on the value of .
reaches its first maximum for when what's inside the sine function is equal to .
In other words, the first maximum emf occurs when
,
where
,
and
.
.
Answer:
Explanation:
Assuming you mean acceleration is 3 m/s²
s = s₀ + ut + ½at²
d = 0 + 0(35) + ½(3)35² = 1,837.5 m
v = u + at
v = 0 + 3(35) = 105 m/s