Efficiency of a machine = (useful output energy) / (total input energy)
Efficiency = (500 J output work) / (Carlotta's 2,000 J input work)
Efficiency = (500 J) / (2,000 J)
Efficiency = 0.25
<em>Efficiency = 25%</em>
Answer:
<u>The answer is the third option.</u>
Explanation:
The electrostatic force, Coulomb's force, is a force that depends on the inverse of the square distance, it is a non-contact force.
On the other hand, stretched spring is a contact force, it needs a contact external force.
Therefore, <u>the answer is the third option.</u>
I hope it helps you!
The formula we can use here is:
g = G m / r^2
where g is gravity, G is gravitational constant, m is
mass, and r is radius
Since G is constant, therefore we can equate two
situations:
g1 m1 / r1^2 = g2 m2 / r2^2
(10 m/s^2) r1^2 / m1 = g2 * (1/2 r1)^2 / (1/8 m1)
<span>g2 = 5 m/s^2</span>
Answer:
a) Ffloor = 616.56[N]
b) Ffloor = 484.16 [N]
Explanation:
In order to solve this problem, we must first make a free body diagram. In this free body diagram include forces, as well as acceleration.
Then after the free body diagram, we perform a force analysis by means of Newton's second law, where the upward forces and even the upward acceleration will be taken as positive.
ΣF = m*a
where:
F = force [N] (units of Newtons]
m = mass [kg]
a = acceleration [m/s²]
g = gravity acceleration = 9,81 [m/s²]
a)
![F_{floor} -(56*9.81)=56*1.2\\F_{floor}= 616.56[N]](https://tex.z-dn.net/?f=F_%7Bfloor%7D%20-%2856%2A9.81%29%3D56%2A1.2%5C%5CF_%7Bfloor%7D%3D%20616.56%5BN%5D)
b) Using Newton's second law we have.
![F_{floor}-m*g= -m*a\\F_{floor}=-m*a+m*g\\F_{floor} = -(56*1.2) + (56*9.81)\\F_{floor} = 484.16 [N]](https://tex.z-dn.net/?f=F_%7Bfloor%7D-m%2Ag%3D%20-m%2Aa%5C%5CF_%7Bfloor%7D%3D-m%2Aa%2Bm%2Ag%5C%5CF_%7Bfloor%7D%20%3D%20-%2856%2A1.2%29%20%2B%20%2856%2A9.81%29%5C%5CF_%7Bfloor%7D%20%3D%20484.16%20%5BN%5D)
Answer: Gases have three characteristic properties: (1) they are easy to compress, (2) they expand to fill their containers, and (3) they occupy far more space than the liquids or solids from which they form. An internal combustion engine provides a good example of the ease with which gases can be compressed.
Explanation:
