Revised Higher Questions Suitability

Our Dynamic Universe

1.  A projectile is launched at a velocity of 12m/s at an angle of 30 deg to the horizontal.  Calculate the horizontal and vertical components of velocity, the time of flight and the horizontal distance covered.

2.  A stationary 3 Kg mass experiences a force of 500N for 8 milliseconds.  Calculate the speed of the weight after the force has been applied.

3.  An object of mass 400Kg sits on a slope of 20 deg to the horizontal.  The object slides down the slope accelerating at 2.5 m/s2.  Calculate the frictional force acting on the object moving down the slope.

4.  A rock of real length 20m accelerates to 0.9c.  Calculate its length at this speed as measured by a stationary observer.

5.  The stopclock on a spaceship reads that a time of 6 hours has elapsed when the spaceship has been travelling at 0.6c.  Calculate the equivalent time as measured by a stationary observer.

6.  Write down the doppler equation, and state the meaning of each variable.

7.  A siren on top of an emergency vehicle travelling at 40 m/s produces a tone of 400Hz.  Calculate the frequency heard by a stationary pedestrian at the side of the road.

8.  Write down the formula describing the law of gravitation.

9.  Write a short note on the ‘Hubble Constant’.

10.  What is ‘red shift’?