Force, mass, pressure calculations

A mass of 45kg falls due to gravity. Calculate the force with which it hits the ground ? (g= 9.81 m/s²⁾

• 450 N

• 691.98 N

• 441.45 N

• 235.23 N

If an object hits the ground with a force = 135N, calculate the mass of the object.

• 234.0 Kg

• 56.45 Kg

• 13.76 Kg

• 12.12 Kg

A 1 Ton mass has to be lifted against gravity. Calculate the force required to do this. (1T = 1000Kg)

• 981 N

• 98.1 N

• 9.81 N

• 9810 N

A force of 100N is exerted over an area of 1m² , calculate the pressure exerted.

• 100 N/m²

• 1000 N/m²

• 10000 N/m²

• 10 N/m²

A load has a mass = 69 Kg and is exerted over an area of 8cm² , calculate the pressure exerted.

• 346.11 kN/m²

• 846.1 kN/m²

• 8461.0 kN/m²

• 84.61 kN/m²

A load has a mass = 90kg and is exerted over and area of 12mm² , calculate the pressure exerted.

• 73.58 kN/m²

• 735.8 kN/m²

• 7.358 kN/m²

• 882.9 kN/m²

A mass of 88kg exerts a pressure of 196kN/m². Calculate the area over which the mass exerted its force. The answer must be expressed in m²

• 440 m²

• 44 m²

• .044 m²

• 0.0044 m²

A worker throws a 5 kg object from a roof to the ground. If the object hits the ground with a force = 80 N, calculate how much MORE acceleration was added to gravity, by the worker, when he threw the object. (F = m x a)

• 6.19 m/s²

• 16.9 m/s²

• 9.16 m/s²

• 1.96 m/s²