In the demolition of an old building, a 1,300 kg wrecking ball hits the building at 1.07 m/s2. calculate the amount of force at which the wrecking ball strikes the building. the wrecking ball strikes the building with a force of n.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.