The distance from the earthquake`s focus.
Answer:
b) No acceleration in the vertical
c) 35N
d) 35N
e) ![8.75\ m/sec^2](https://tex.z-dn.net/?f=8.75%5C%20m%2Fsec%5E2)
Explanation:
a) The situation can be shown in the free body diagram shown in the figure below where F is the applied force, Fr is the friction force, W is the weight of the book and N is the normal force exerted vertically up from the desk to the book
b) The vertical movement is restrained by the normal force which opposes to the weight. In absence of any other force, they both are in equilibrium and the net force is zero
c) The net horizontal force acting on the book is the vectorial sum of the applied force and the friction force. Since they lie in the same axis and are opposed to each other:
![Fh_{net}=F-F_r=50 N - 15N=35N](https://tex.z-dn.net/?f=Fh_%7Bnet%7D%3DF-F_r%3D50%20N%20-%2015N%3D35N)
d) The net force acting on the book is the vector sum of all forces in all axes. The normal and the weight cancel each other in the y-axis, so our resulting force is the x-axis net force, computed as above:
in the x-axis
e) Following Newton's second law, the acceleration is calculated as
![a=\frac{F_t}{m}=\frac{35N}{4Kg}=8.75m/sec^2](https://tex.z-dn.net/?f=a%3D%5Cfrac%7BF_t%7D%7Bm%7D%3D%5Cfrac%7B35N%7D%7B4Kg%7D%3D8.75m%2Fsec%5E2)
Answer:
T = 53.44 ° C
Explanation:
For this exercise we will use the relationship between the speed of sound and the wavelength and frequency
v = λ f
v = 0.285 1270
v = 361.95 m / s
The speed of sound is related to temperature in degrees Celsius
v = 331 √(1 + T / 273)
v² / 331² = 1 + T / 273
T / 273 = v² / 331² -1
T = 273 (v² / 331² -1)
Let's calculate
T = 273 (361.95²/331² -1)
T = 53.44 ° C
Relativistic energy is the energy that is in the form of mass, E=mc² where c=speed of light, therefore the energy=0.3*(3*10^8)² =2.7*10^16 J
Answer:
Furniture mover.
Explanation:
A strain is a soft tissue injury that happens on the muscle or tendon - it could occur on several parts of the body, such as hands or legs. When it is acute, an incident might have caused it and proper rest would let it heal.
This type of injury could happen to athletes, but those who are at risk are those who are involved in sports field such as wrestling and football. Thus, baseball players are a lower risk.
Bank tellers and heart surgeons would not suffer from this type of injury - they are more likely to suffer from chronic than acute strains do to the overuse of certain muscles.
The group that is at the highest risk are people who move heavy objects - such as furniture mover.