Answer:
The tires make 125 revolutions before the car stops
Explanation:
Circular and Linear Motion
A tire rotates around a fixed point and the tire when in contact with the ground, drives a vehicle in a linear path. This is an example of a relationship between both types of movements that can be taking place simultaneously.
The car is moving with an initial speed of
and then breaks at
until it stops. We can compute the time take to stop by using
Solving for t
Putting in numbers
Now, let's transfer this information to the circular motion. We know the tangent speed is
Being w the angular speed and r the radius of the circle, in this case, the tires. The tangent speed is the same as the speed of motion of the car. It gives us the initial angular speed
When the circular motion is not uniform, i.e. there is angular acceleration
, the angular speed is a function of time
We can compute the angular acceleration knowing the final angular speed is zero when the car stops.
The rotation angle is also a function of time as shown
Using the given and computed values
Knowing each revolution is
radians, the number of revolutions is
The tires make 125 revolutions before the car stops
PART a)
By energy conservation we can say


divide whole equation by mass "m" and plug in all given data
![9.8(1.24) + \frac{1]{2}(1.7)^2 = 9.8(0) + \frac{1}{2}(v)^2](https://tex.z-dn.net/?f=9.8%281.24%29%20%2B%20%5Cfrac%7B1%5D%7B2%7D%281.7%29%5E2%20%20%3D%209.8%280%29%20%2B%20%5Cfrac%7B1%7D%7B2%7D%28v%29%5E2)

so gymnast will reach the floor with speed 5.21 m/s
PART b)
Now the gymnast bend her knees by 0.1 m and comes to rest
so here we will have



now the force on the gymnast will be


so during landing the force will be 6798.5 N
Wood, wind, sunshine,geothermal energy, biomass and water
The y-component of the force on the particle at the given position is 120 N.
<h3>
Electric force on the particle</h3>
The electric force on the particle is determined by applying Coulomb's law and work-energy theorem as shown below;
Fd = W
Where;
- F is the applied force
- d is the distance
- W is potential
F = W/d
F = 60/0.5
F = 120 N
Thus, the y-component of the force on the particle at the given position is 120 N.
Learn more about electric force here: brainly.com/question/20880591
Answer:
The correct answer is "20 Volts".
Explanation:
Given:
Heat,
H = 100 J
Resistance,
R = 4 Ω
As we know,
⇒ 
By putting the values, we get
⇒ 
⇒ 
⇒ 
⇒ 
⇒