The speed of the cart after 3 seconds of Low fan speed is equal to 54 cm/s.
<h3>How to calculate the speed?</h3>
Mathematically, speed can be calculated by using this formula;
Speed = distance/time
At Low fan speed after 3 seconds, the distance covered is 162 cm:
Speed = 162/3
Speed = 54 cm/s.
At Medium fan speed after 5 seconds, the distance covered is 600 cm:
Speed = 600/5
Speed = 120 cm/s.
At High fan speed after 2 seconds, the distance covered is 128 cm:
Speed = 128/2
Speed = 64 cm/s.
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Answer:
3.63 s
Explanation:
We can solve the problem by using the equivalent SUVAT equations for the angular motion.
To find the angular acceleration, we can use the following equation:
where
is the final angular speed
is the initial angular speed
is the angular distance covered
is the angular acceleration
Re-arranging the formula, we can find :
Now we want to know the time the bit takes starting from rest to reach a speed of . So, we can use the following equation:
where:
is the angular acceleration
is the final speed
is the initial speed
t is the time
Re-arranging the equation, we can find the time:
Answer:
0.51
Explanation:
m = Mass = 70 kg
g = Acceleration due to gravity = 9.81 m/s²
t = Time taken
u = Initial velocity = 80 km/h = 80/3.6 = 22.22 m/s
v = Final velocity
a = Acceleration
s = Displacement = 50 m
Kinetic coefficient of friction between the road and the crate is 0.51
<h2>RED!</h2><h3></h3><h3>On the visible spectrum, red has the lowest frequency.</h3><h3>(I'm an amateur astronomer, so I would know.)</h3>
The change in momentum of the ball is D) 1.8 kg m/s
Explanation:
The change in momentum of the ball is given by:
where
m is the mass of the ball
v is the final velocity
u is the initial velocity
In order to calculate the change in momentum correctly, we have to correctly take into account the sign of the velocity. Taking the final direction of the ball as positive direction, we have:
u = -12 m/s is the initial velocity
v = +18 m/s is the final velocity (it changes sign because the direction has changed)
m = 0.060 kg is the mass of the ball
Solving the equation, we find the change in momentum of the ball:
Learn more about change in momentum:
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