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)
b) Using Newton's second law we have.
Speed is scalar quantity that is defined only by its magnitude and is represented with one value.
Velocity on the other side is a vector quantity that is defined with its magnitude and direction. The speedometer measures and displays the speed of the vehicle.
Where the needle points on the speedometer that is the speed of the vehicle.
The velocity is not explicitly shown, but if f the needle is moving<span>, you can get a rough idea of acceleration. If the needle is going clockwise the vehicle is accelerating.</span>
Answer:
A) Air
Explanation:
In refrigerator system the compressor will compress the gas at high pressure so that its temperature is too small and if is passed through the air inside the refrigerator.
When this low temperature gas is passed through the air inside the refrigerator then it will extract the heat from the space or air at high temperature and hence it is the source of energy inside the refrigerator.
Heat pumps are used in in cold atmosphere where we require thermal energy to keep the temperature high. Here compressor will work on the gas so that it will absorb the heat from surrounding air and release it to the room or inside space.
So here in both cases the source of energy here is Air which will give heat to the system.
Answer:
increases dramatically
Explanation:
due to resistance tends to prevent the motion of a body. When speed increases, the particles of air are set into motion and this energizes them. More air gains increased acceleration and they collide with a body. This initiates a resistance against the motion of such body. for instance, wind resistance increases rapidly as speed increases.
Answer: 4.17 m
Explanation: According to the law of conservation of energy, the elastic potential energy of the elastic material is used in launching the mass hence giving the body it potential energy.
Elastic potential energy = kx²/2
Potential energy = mgh
Where m = mass of object = 0.24kg
g = acceleration due to gravity = 9.8 m/s²
h = height =?
k = spring constant = 850 N/m
x = compression = 31cm = 0.13m
kx²/2 = mgh
kx² = 2× mgh
850 ×(0.31)² = 2 × 9.8 × h
h = 850 × (0.31)²/ 2 × 9.8
h = 81.685 / 19.6
h = 4.17 m