In the diagram above, AB represents a uniform rod of length 1.50m which is in equilibrium on a pivot at P, If AP = 40cm, calculate the mass of the rod. [g = 10ms-2]
Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved
A
parallel to the line of action of the force from a reference point
B
perpendicular to the line of action of the force from a reference point
C
on a line through the reference point
D
by the object
correct option: a
The quantity of work done (or energy converted) by a force, when the force moves, depends on two obvious factors:
- the distance moved (in the direction along which the force acts) and
- the magnitude (strength) of the force
a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms-2]
The ice and steam points of a certain thermometer are -20o and 100o respectively. Calculate the Celsius temperature temperature corresponding to 70o on the thermometer
Water of mass 120g at 50oC is added to 20og of water at 10oC and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]
A
60oC
B
40oC
C
25oC
D
10oC
correct option: c
120 x 4.2(50 - (\theta)) = 200 x 4.2((\theta) - 10)