The force of friction is 213.2 N
Explanation:
The frictional force acting on an object sliding on a surface is given by:
where:
is the coefficient of friction
m is the mass of the object
g is the acceleration of gravity
In this problem we have
m = 29 kg
Therefore, the force of friction is
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Answer:
(a). The pressure is 14.76 psi.
(b). The pressure is 15.59 psi.
(c). The pressure is 15.68 psi.
All answer are reasonable.
Explanation:
Given that,
Speed v₁= 60 mph
Speed v₂ = 225 mph
Speed v₃ = 235 mph
(a). We need to calculate the maximum pressure on his hand
Using equation of pressure
there, no vertical movement
So, on neglect of height term
Where, P= atmospheric pressure
= air density
v = speed
Put the value in the equation
(b). Speed v₂ = 225 mph
We need to calculate the maximum pressure on his hand
Using equation of pressure
Put the value in the equation
(c). Speed v₃ = 235 mph
We need to calculate the maximum pressure on his hand
Using equation of pressure
Put the value in the equation
According to bernoulli's equation,
If the car increases the velocity the the pressure on the surface of the driver's hand increases.
The pressure from P₁ to P₃ are all near the value of one atmosphere.
So, the pressure difference of one atmosphere is not enough to break the driver's hand.
Hence, (a). The pressure is 14.76 psi.
(b). The pressure is 15.59 psi.
(c). The pressure is 15.68 psi.
All answer are reasonable.
Answer:
3.59 m/s
Explanation:
The average velocity is defined as:
The turtle first walks 18m south, and then is taken 1,1Km (or 1100m) north. Thus, the total displacement is 1082m north (1100m north - 18m south).
Now we have to calculate the total time, which will be equal to the sum of the time the turtle walked and the time it was taken by truck.
The walking time is 3.5 minutes. Since 1 minute = 60 seconds, then the walking time is 210 seconds.
To calculate the truck time we use the equation:
Time =
Where the distance the truck travelled is 1100m and the speed of the truck is 12m/s.
Thus,
Truck time= = 91.67s
The total time is the sum of the walking time and the truck time.
Total time = 210s + 91.67s = 301.67s.
As mencioned previously, the average velocity is equal to total displacement/ total time, thus:
Average velocity = = 3.59 m/s North
Since the average velocity is a vector, it has a magnitude and a direction. In this case the magnitude is 3.59 m/s and the direction is north since the turtle's final displacement is north of where it started.