Answer;
The above statement is True
Kinetic friction is affected by the weight of the object.
<h3><u>Explanation;</u></h3>
- Kinetic friction is a force that acts between moving surfaces. An object that is in motion over a surface experiences a force in the opposite direction to the direction of movement.
- The equation for kinetic friction is given by the formula;
F= coefficient of friction * Normal force.
- Normal force is the force of the table pushing back on the block and can be calculated by formula;
F = mass* acceleration due to gravity.
- Therefore, the weight of an object determines its kinetic friction.
Answer:
y = 2.2t + 30.2
Explanation:
t = 3 represents 1983, and t = 9 represents 1989.
Two points on the line are (3, 36.8) and (9, 50).
First, find the slope of the line.
m = (50 − 36.8) / (9 − 3)
m = 2.2
Now use point-slope form to write the equation:
y − 36.8 = 2.2 (t − 3)
If you wish, simplify to slope-intercept form:
y − 36.8 = 2.2t − 6.6
y = 2.2t + 30.2
Answer:
0.16 Hz
Explanation:
frequency = speed/wavelength
= 20/125 = 0.16 Hz
<span>light colored and smooth surface would most likely be the best reflector of electromagnetic energy.Light, shiny surfaces are the best reflectors of radiation and they will allow the waves to reflect and bounce off rather than absorb. we can consider mirror as the example ,it will only reflect the light energy falling on them and it will not absorb. The darker coloured and rough surfaced substances will definitely absorb some amount of light falling on it. so light coloured smooth or shiny surfaced material would be the best reflector for electromagnetic energy.</span>
Answer:
18.62 m/s
Explanation:
Given that:
A liquid with a density of 900 kg/m 3 is stored in a pressurized, closed storage tank.
Diameter of the tank = 10 m
The absolute pressure in the tank above the liquid is 200 kPa = 200, 000 Pa
At pressure of 200 kPa ; the final velocity = 0
Atmospheric pressure at 5cm = 101325 Pa
We are to calculate the initial velocity of a fluid jet when a 5cm diameter orifice is opened at point A?
By using Bernoulli's theorem between the shaded portion in the diagram;
we have:
where;
Pa = atmospheric pressure = 101325 Pa
= density of liquid = 900 kg/m³
= initial velocity = ???
g = 9.8 m/s²
= height of the hole from the buttom
= height of the liquid surface from the button
Thus, the initial velocity of the fluid jet = 18.62 m/s
