Physics Answers

The displacement against time graph for an object is shown below.

A.Describe the motion of the object.

B. For the object, calculate:

i.its velocity at 2.0 s

ii.its average velocity for a period of 12 s.

An athlete takes a time of 9.82 s to cover a distance of 100 m. Calculate the average speed of he athlete.

A Define speed

B.State whether speed is a scalar or a vector quantity.

C.The diagram shows an artificial satellite orbiting the Earth. Its or bital speed is constant.

With reference to the velocities of the satellite at points

X and Y, state:

i one similarity

ii one difference

Which of the following correctly describes the vector shown below? The length of the arrow is 6 cm.

Water is flowing at a rate of 100 L/s in a 20 cm diameter pipe. How fast is the water flowing in m/s?

 A person has a weight of 882 N at surface of the earth. Find his weight, W, and the acceleration due to gravity, ag, at an altitude of two earth’s radius, r.

Does the speed of a satellite around the earth depend on its mass? Its distance from the earth? The mass of the earth? Justify your answer.

If the earth were the same size but twice as massive, what would be the value of G? What would be the value of g? (Let your equation g = Gm/d2 guide your thinking.)

Which requires more fuel – a rocket going to the moon, or a rocket coming from the moon? Why?

A 10cm   inside diameter pipe carries a water flowing at  10 m/s.  Find its mass flow rate in kg/s  taking water density as   1 000  kg / cu m