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The work needed to raise a load of 95kg to a height of 30 m is approximately
28 J
2.79 kJ
28 kJ
285 J
The pivot point of a lever is called
centre
pulley
Load
fulcrum
Calculate the MASS of the LOAD required to balance the EFFORT applied shown below.
824.6kg
1160.1kg
118.3kg
266.2kg
A motor has an input power of 3 kW and is 85 % efficient. What is the output power?
2.55 kW
3 kW
3.53 kW
2.4 kW
If an object has a mass of 50 Kg on earth, in space its mass would be
100 kg
490 kg
50 kg
41 kg
What is the power of a hoist required to lift an object of 20 kg, 20 m in 30 seconds.
3.3kW
1.3kW
13.3W
130.8W
Pliers rely on which principle for their operation
leverage
tension
torsion
friction
A motor has an input power of 50kW and an output power of 47kW. What is the efficiency of the motor?
100 %
86 %
96 %
94 %
A motor has an output power of 40kW and an efficiency of 80%. What is the input power of the motor?
32 kW
50 kW
40 kW
54 kW
The power input to a machine is 90 W and the output power is 60 W the efficiency of the machine is
66.6 %
75 %
80 %
The weight of an object is the
mass of the object divided by 9.81
the same as the mass when there is gravity
force acting on top of the object due to gravity
force acting directly below the object due to gravity
A mass of 9.5 Kg exerts a force on earth of
9.3 N
95 N
9.5 N
93.2 N
What is the power of a motor required to lift a load of mass 300kg 40m in 2 minutes.
981 W
6000 W
98.1 W
100 W
Calculate the distance D required to balance the effort and load shown
5.64m
6.65m
4.54m
6.45m
A motor has an output power of 40kW and an efficiency of 66.66%. What is the input power of the motor?
30 kW
60 kW
70 kW
A 2kW heater is 90% efficient. The input power to the heater is
5kW
1.88kW
3kW
2.22kW
A mass of 30kg would have an weight of
0.327N
3.05kN
3.05N
294.3N
A motor has an efficiency of 73%. If the input power is 32kW, the output power available is
76.64kW
23.36kW
22.8kW
32kW
Calculate the work done when required to raise a load of 1000kg through a vertical distance of 20m.
19620J
20000J
200000J
196200J
A force of 50kN moves an object a distance of 2m. The work done is.
25kJ
50kJ
100kJ
200kJ
From the following diagram identify the Mass
2.5kg
10kg
5kg
30kg
From the following diagram what is the arrow pointing to
Fulcrum
middle point
Distance
What is the relationship between force, mass and acceleration?
f = ma
f = m/a
f = m - a
f = m + a
What is the work done when a force of 30N move an object 10m
200 metres
300 Horse power
300 Watts
300 Joules
What is the gravitational pull on earth
The force of gravity on earth is considered to be
A load of 50Kg has a force of 25N applied what is the acceleration of the load