thankyouJesus:
Good morning all, I was impressed by the solution provided by you guys, keep it. God will water your bread.
Work.
In ordinary meaning, work refers to any kind of physical or mental activity. But in physics, work is always associated with movement. Thus, work is said to be done if a force applied makes the object to move a distance in the direction of the applied force.
Work is defined as the product of force and perpendicular distance in the direction of the applied force. It is denoted by w, measured in Joule and a scaler quantity.
Mathematically;
work = force X distance
w = f X s
since, force = mass X acceleration
work = m X a X s.

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Example; A crane lifts a load of 2kg very slowly through a vertical distance of 100cm. Calculate the workdone against gravity if g = 10m/s².
Solution;
load=2kg
s=100cm=1m
a=g=10m/s².
Workdone=F X S
w=mas
w=2 X 10 X 1
w=20J.

work can also be defined as energy used .....

monerozi5590:
work can also be defined as energy used .....

Welcome

monerozi5590:
work can also be defined as energy used .....

incomplete

I have a question hoping to see the solution soonest
A capillary tube of radius 5.0 × 10-5 m is dipped vertically into water contained in a trough. If the surface tension of water is 0.073 Nm-1 and the angle of contact between water and the material of the tube is negligible, determine how high the water will rise in the tube above the surface of the water in the trough. Density of water = 1.0 × 10^3 kgm-3, g = 10 ms-2]

H=2Tcosø/prg
Since cosø is negligible it is 1
H=2*0.073*1/1.0 × 10^3 * 5.0 × 10-5*10

A battery of e.m. f 12v and internal resistance 1. 5 ohms is connected to an external resistor of resistance 3ohms. calculate the current flowing in the circuit. calc the pd across the 3 ohms resistor and the internal resistance. calc the terminal voltage of the battery.

A body of mass of 20kg appears to have a mass of 13kg in oil and 12kg in water. what is the relative density of the oil?

kemieve:
A body of mass of 20kg appears to have a mass of 13kg in oil and 12kg in water. what is the relative density of the oil?

Relative density of liquid x = Upthrust in liquid x/Upthrust in water
Rd = (W_air - W_liquid)/(W_air - W_water)
(20 - 13)/(20 - 12) = 7/8

kemieve:
A battery of e.m. f 12v and internal resistance 1. 5 ohms is connected to an external resistor of resistance 3ohms. calculate the current flowing in the circuit. calc the pd across the 3 ohms resistor and the internal resistance. calc the terminal voltage of the battery.

Emf = V + Ir; where V is the terminal voltage, r = internal resistance, R = external resistance
E = IR + Ir.
You can finish it if from here

Guys, I was just flipping through my textbook's pages and the formula for maximum height of a projectile caught my attention

The formula is H = U²sin²O/2g

sin²O gives a math error... in fact sin² doesn't make sense, please someone should put me through, how do I find the square of sin

Donpre:
Guys, I was just flipping through my textbook's pages and the formula for maximum height of a projectile caught my attention

The formula is H = U²sin²O/2g

sin²O gives a math error... in fact sin² doesn't make sense, please someone should put me through, how do I find the square of sin

Ok, here is it
Sin²@ = (Sin@)²
For example, if @=30°
Sin²30 = (Sin30)² = (0.5)² = 0.25
I hope you got that

mathefaro:
Ok, here is it Sin²@ = (Sin@)² For example, if @=30° Sin²30 = (Sin30)² = (0.5)² = 0.25 I hope you got that

yea I did... thanks a lot

Donpre:

yea I did... thanks a lot

you're welcome

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