Answer:
The force of the floor on the briefcase
Explanation:
The briefcase hits the floor and stops the falling which is reacting to the briefcase that was falling and hits the floor.
The falling briefcase would be the action force because it is moving downward
and
The reaction force would be the floor because it will react on the briefcase.
Hope this Helps
Answer:
Effort = 540 Newton
Explanation:
Given the following data;
Load arm = 60 cm
Effort arm = 40 cm
Load = 360 N
Conversion:
100 cm = 1 meters
40 cm = 40/100 = 0.4 meters
60 cm = 60/100 = 0.6 meters
To calculate the effort that Reha should apply to lift Neha, we would use the expression;
Effort * effort arm = load * load arm
Substituting into the expression, we have;
Effort * 0.4 = 360 * 0.6
Effort * 0.4 = 216
Effort = 216/0.4
Effort = 540 Newton
Answer:
For your first question, it is C.
For your second question, it is A.
For your third question, it is A, again.
For your final question, it is B.
Have a wonderful day! :D
To develop this problem it is necessary to apply the concepts related to the Dopler effect.
The equation is defined by
![f_i = f_0 \frac{c}{c+v}](https://tex.z-dn.net/?f=f_i%20%3D%20f_0%20%5Cfrac%7Bc%7D%7Bc%2Bv%7D)
Where
= Approaching velocities
= Receding velocities
c = Speed of sound
v = Emitter speed
And
![f_h = f_0 \frac{c}{c+v}](https://tex.z-dn.net/?f=f_h%20%3D%20f_0%20%5Cfrac%7Bc%7D%7Bc%2Bv%7D)
Therefore using the values given we can find the velocity through,
![\frac{f_h}{f_0}=\frac{c-v}{c+v}](https://tex.z-dn.net/?f=%5Cfrac%7Bf_h%7D%7Bf_0%7D%3D%5Cfrac%7Bc-v%7D%7Bc%2Bv%7D)
![v = c(\frac{f_h-f_i}{f_h+f_i})](https://tex.z-dn.net/?f=v%20%3D%20c%28%5Cfrac%7Bf_h-f_i%7D%7Bf_h%2Bf_i%7D%29)
Assuming the ratio above, we can use any f_h and f_i with the ratio 2.4 to 1
![v = 353(\frac{2.4-1}{2.4+1})](https://tex.z-dn.net/?f=v%20%3D%20353%28%5Cfrac%7B2.4-1%7D%7B2.4%2B1%7D%29)
![v = 145.35m/s](https://tex.z-dn.net/?f=v%20%3D%20145.35m%2Fs)
Therefore the cars goes to 145.3m/s
Answer:
a) heat flows from the warm plate to the cold one
Explanation:
Heat is an expression of energy, the bodies with more heat mean that they have more energy. In this way, they can share or pass this "excess" of energy to the cold body. Both plates are not in total contact but some part are close enough (they are touching) that the heat can pass from one to the other. Also the heat always need a media to travel, in this case, the air that surrounds the plates is also the media that the heat travels from the hot to the cold one.