Correct Answers is A.
The machines gives us some mechanical advantage. This means the mechanical average makes the work output greater than the work input
Simple most example is a lever. The force applied is smaller and the output work is larger as compared to input.
Option B cannot be true, as there must be a force to get some work done.
Option C and D are inverse of what a machine is designed for. A small force can be exerted through a large distance to have a large force exerted through a small distance. Common Example of this principle is a screw opener.
Answer:
p = 727.273 kg/m3, y = 7134.545 N/m^3, SG = 0.7273
Explanation:
Density is simply the amount of mass of a substance per unit of volume. It can be found by dividing the mass in kg by the volume im m^3:
Specific weight is the weight of the substance per unit of volume. The weight is the mass of the material times the gravity, and it represents the force that the earth exerts on an object. Another way of calculate this value, its multiplying the density of the fuel times the gravity. Then:
Specific Gravity is the ratio of the density of the substance to the density of a reference substance. For liquids, the reference substance is water at 4°C, which has a density of about 1000 kg/m^3.
<span>C. As a metal comb is held near an object with a negative charge, the comb becomes charged.
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Answer:
1) The net force is 5 N. The box is accelerating 10 m/s
2) The net force is 6.986 N. It is accelerating. Normal Force is 16.986
Explanation:
1) 20 N forward - 15 N backwards = a net force of 5 N
Acceleration: Acceleration = Net Force * Mass ( derived from Force = mass * acceleration).
a = 5 N / 2 kg
a= 2.5 m/s^2
2)
