Answer:
The net force is zero, if there is not external forces. The net force if the body is accelerating will be the product of the mass by the acceleration.
Explanation:
If the box does not accelerate, there are two possible options, either the box moves at constant velocity or does not receive any external force to alter its balance.
Newton's Second Law, also known as the Fundamental Law of dynamics, determines a proportional relationship between Force and variation of the amount of motion or linear moment of a body. In other words, The Force is directly proportional to the mass and acceleration of a body.
![F=m*a\\where:\\m= mass [kg]\\a=acceleration[m/s^2]](https://tex.z-dn.net/?f=F%3Dm%2Aa%5C%5Cwhere%3A%5C%5Cm%3D%20mass%20%5Bkg%5D%5C%5Ca%3Dacceleration%5Bm%2Fs%5E2%5D)
![0=m*a\\a=0[m/s^2]](https://tex.z-dn.net/?f=0%3Dm%2Aa%5C%5Ca%3D0%5Bm%2Fs%5E2%5D)
If there are forces acting on the body and these forces are not in balance the body will move with a resulting force equal to the product of mass by acceleration.
![F_{net} =m*a](https://tex.z-dn.net/?f=F_%7Bnet%7D%20%3Dm%2Aa)
Answer:
Heat is added to a substance, but its temperature does not rise. Which one of the following statements provides the best explanation for this observation? the substance must be a gas. the substance must be a non-perfect solid. the substance undergoes a change of phase. the substance has unusual thermal properties. the substance must be cooler than its environment.
Answer:A is the correct answer..hope this helps
Explanation:Mechanical waves and electromagnetic waves are two important ways that energy is ... Matter that waves are traveling through is called a medium. ... The unit of frequency of a radio wave one cycle per second
Answer:
The Tension in the cable is 392.3N. The vertical reaction at the hinge (fixed end) is 850.3N.
The tension in the cable was calculated using the principles of moments which states that the total sum of the clockwise moments is equal to the total sum of anticlockwise moments on a system in equilibrium.
Explanation:
Sum of Clockwise moments = Sum of anticlockwise moments
900×1 + 200×3 + 90×6 = T×Sin120 × 6
900 + 600 + 540 = 5.20T
T = 2040/5.20 = 392.3N
Summing vertical forces
R + Tsin120 = 900 +200+90
R + 392.3sin120 = 1190
R + 339.7 = 1190
R = 1190 - 339.7
R = 850.3N
Answer:
![\frac{t_1}{t_2} = \frac{sin\theta_1}{sin\theta_2}](https://tex.z-dn.net/?f=%5Cfrac%7Bt_1%7D%7Bt_2%7D%20%3D%20%5Cfrac%7Bsin%5Ctheta_1%7D%7Bsin%5Ctheta_2%7D)
Explanation:
The vertical component of the initial velocities are
![v_v = v_0sin\theta](https://tex.z-dn.net/?f=v_v%20%3D%20v_0sin%5Ctheta)
If we ignore air resistance, and let g = -9.81 m/s2. The the time it takes for the projectiles to travel, vertically speaking, can be calculated in the following motion equation
![v_vt - gt^2/2 = s = 0](https://tex.z-dn.net/?f=v_vt%20-%20gt%5E2%2F2%20%3D%20s%20%3D%200)
![t(v_v - gt/2) = 0](https://tex.z-dn.net/?f=t%28v_v%20-%20gt%2F2%29%20%3D%200)
![v_v - gt/2 = 0](https://tex.z-dn.net/?f=v_v%20-%20gt%2F2%20%3D%200)
![t = 2v_v/g = 2v_0sin\theta/g](https://tex.z-dn.net/?f=t%20%3D%202v_v%2Fg%20%3D%202v_0sin%5Ctheta%2Fg)
So the ratio of the times of the flights is
![t_1 / t_2 = \frac{2v_0sin\theta_1/g}{2v_0sin\theta_2/g} = \frac{sin\theta_1}{sin\theta_2}](https://tex.z-dn.net/?f=t_1%20%2F%20t_2%20%3D%20%5Cfrac%7B2v_0sin%5Ctheta_1%2Fg%7D%7B2v_0sin%5Ctheta_2%2Fg%7D%20%3D%20%5Cfrac%7Bsin%5Ctheta_1%7D%7Bsin%5Ctheta_2%7D)