Some more doubts :$
Q7- A school treasure hunt uses the following set of directions:
A, 80m at 45 degree
B, 40m at 150 degree
C, 50m at 180 degree
D, 60m at 270 degree.
a) Team 1 follows the direction correctly. Draw a vector diagram to find their final displacement.
b) Team 2 gets the directions mixed up and follows them in the order C-B-D-A. What effect will this have on their final position compared to team 1?
Q8- A block is sliding down a plank at a constant speed. The weight of the block is 5N and the plank is 35 degree to the horizontal. Sketch a diagram for the three forces and use it to calculate the friction.
Q9- A ball is kicked off a flat with a horizontal velocity of 12ms^-1. How would you :
a) Calculate the horizontal distance travelled after it has fallen 15m?
b) Calculate the resultant velocity after 1.9s?
Q10- During a school play, a dagger is kicked and slides off the stage with a horizontal velocity of 1.5ms^-1. It lands on the floor a horizontal distance of 80cm away. Calculate the height of the stage.
Q11- What is the volume of a cylinder, of length 26cm and diameter 56mm.
Q12- Calculate the force applied to a surface of 220mm^2 to create a pressure of 10MPa.
Give your answer in kN.
Q13- Estimate average acceleration of a car travelling at 6mph in 8.0s.
Q14- A boat of mass 800kg is pulled along the sand at constant velocity by a cable attached to a winch. The cable is 15 degree to the horizontal.
Draw a free body force diagram for the boat. Label the forces: Tension, Friction, Normal reaction and weight.
Q15- If volume of water displaced for a person having weight 600N is 0.05m^3 in the Dead sea. How is this compared with the volume that needs to be displaced for the person to float in a swimming pool?
Q16- A spring of length 10cm extends to 12.5cm when a 8.0N weight is suspended from it. Calculate the spring constant of the spring.
