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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