Answer:
We cannot tell from the information given
Explanation:
Given;
mass of the box, m = 5 kg
first force, F₁ = 10 N
second force, F₂ = 5 N
(I) Assuming the two forces are acting horizontally in opposite direction, the resultant force on the box is calculated as;
∑Fx = 10 N - 5 N
= 5 N
Apply Newton's second law of motion;
∑Fx = ma
a = ∑Fx/m
a = 5 / 5
a = 1 m/s² in the direction of the 10 N force.
(II) Also, if the two forces are acting in the same direction, the resultant force is calculated as;
∑Fx = 10 N + 5 N
∑Fx = 15 N
a = 15 / 5
a = 3 m/s²
Therefore, the information given is not enough to determine the acceleration of the box.
Answer:
1. B
2. A
3. C
4. B
5. A
6. Muscular strength is different than muscular endurance because of the fact that muscular strength is the amount of force that can be exerted in one instance. Muscular endurance is how long that you can exert that force without being completely exhausted.
7. Some benefits to strength training is the increase in muscular endurance. There is also the benefit of better muscular strength.
Explanation:
Answer:
Mass has total mechanical energy, which is the sum of kinetic and potential energy. as the mass is dropping, potential energy is converted into kinetic energy so mechanical energy is preserved If there is no friction. If there is friction, some of the mechanical energy is lost as heat energy so it changes.
Explanation:
Explanation:
Given that,
Force, F = 70 N
Angle, ![\theta=50^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%3D50%5E%7B%5Ccirc%7D)
Acceleration of the boy, a = 1.8 m/s²
(a) Net force is equal to the product of mass and acceleration. So,
![m=\dfrac{F}{a}\\\\m=\dfrac{70}{1.8}\\\\m=38.89\ kg](https://tex.z-dn.net/?f=m%3D%5Cdfrac%7BF%7D%7Ba%7D%5C%5C%5C%5Cm%3D%5Cdfrac%7B70%7D%7B1.8%7D%5C%5C%5C%5Cm%3D38.89%5C%20kg)
(2) Normal force = upward force
So,
![F=mg\cos\theta\\\\F=38.89\times 9.81\times \cos(50)\\F=245.23\ N](https://tex.z-dn.net/?f=F%3Dmg%5Ccos%5Ctheta%5C%5C%5C%5CF%3D38.89%5Ctimes%209.81%5Ctimes%20%5Ccos%2850%29%5C%5CF%3D245.23%5C%20N)
Hence, mass is 38.89 kg and the normal force is 245.23 N.