Answer:
F = 789 Newton
Explanation:
Given that,
Speed of the car, v = 10 m/s
Radius of circular path, r = 30 m
Mass of the passenger, m = 60 kg
To find :
The normal force exerted by the seat of the car when the it is at the bottom of the depression.
Solution,
Normal force acting on the car at the bottom of the depression is the sum of centripetal force and its weight.



N = 788.6 Newton
N = 789 Newton
So, the normal force exerted by the seat of the car is 789 Newton.
Answer:
Thomson
Explanation:
Thomson in 1904 soon after the discovery of the electron, but before the discovery of the atomic nucleus, the model tried to explain two properties of atoms then known: that electrons are negatively-charged particles and that atoms have no net electric charge.
The answers are:
<u>39:</u>
a - 1 mile
b - 0 miles
<u>40:</u>

<u>41:</u>

Why?
Solving 39:
To answer the questions, we need to remember that distance and displacement are different things. Distance refers to the total "ground" covered during motion, while displacement refers to how far is the object/body from its starting point.
So,
<u>39:</u>
a - the total distance traveled corresponds to the length of the track which is 1 mile.
b - The displacement is equal to 0 because they finished at the starting point, the distance between the starting and the finishing point is equal to 0.
<u>40:</u>
We can solve the problem using one of the given equations:

Since we know all the information, we just need to substitute it into the equation:

So, the car's acceleration was -4m/s2 (the car was reducing its speed)
<u>41:</u>
We can solve the problem using one of the given equations (Pythagorean Theorem):


The distance will be:

Have a nice day!
Tension in the string when the masses are released is 88.42 N
Acceleration of masses is 
Explanation:
Given:
Mass ,m1 = 12
Mass , m2 = 7
g = 
To Find :
Tension in the string=?
Acceleration of masses=?
Solution:
For mass M_1
--------------------(1)
For mass M2
---------------------(2)
Adding equation (1) and (2)

Finding Acceleration:
Acceleration is given by

Substituting the values,




Finding Tension:
From Equation 1

Tension can be

T=(7)(2.578) + 7(9.8)
T=(17.99)+(68.6)
T=86.59 N