C1 A spring with its upper end fixed, hangs vertically alongside a metre rule. The
lower end of the spring gave the following readings in Table C1.1 when various
masses were hung from it.
Mass (kg)
Reading (cm)
Applied force (N)
Extension (cm)
0 0.02 0.04 0.06 0.081.00
10.0 12.0 14.0 16.0 17.0 17.5
0
1.0
7.5
(a)
(b)
Table C1.1
State Hooke's law.
Copy and complete the table for the values of applied force (N) and
extension (cm) produced.
Draw a graph of applied force against extension on a graph paper,
[4]
[1]
On the graph, show the elastic limit.
[Total: 10 marks]
(c)
(d)

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i.e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?