GUIDELINE TO ENTER THE LAB PT. 2

1. Do not bring any food and drinks into the laboratory.

2. Enter the lab with permission only.

3. Come earlier to the lab.

GUIDELINES TO ENTER THE LAB

1. Leave YOUR bags at the allocated cupboard.
2. Wear FULLY covered shoes and lab coat.
3. Please finish the session 10 minutes earlier before the end time(if earlier than that it could be better).
4. Get familiar with all equipment, materials and procedures of the experiment.
5. Always ask the instructor aka lecturer when you do not familiar and do not know about the setup.
6. Do not bring the setup out of the lab or into another lab.
7. Please inform the your instructor earlier if you cannot attend the lab session due to emergency with valid reason (certs,MC).
8. Always becareful while doing and running the experiments, if there any damabe or loss occured, the students will be liability to any loss or damage.

Happy weekend...

Assalamualaikum to all,

Please try the latest tutorial even if we do not start the new chapter..huhu..im searching past years questions 4 all of u and try to paste here as soon as possible. Hopefully u can try all the questions, if there any problems, please do not hesitate to give a comments,suggestions and complaints to me directly.

Happy weekend :)

TUTO 1 B

TUTORIAL 1B-PHYSICS, SHF 1215, SEM 2, 2010/2011

1 A whale swims due east for a distance of 6.9 km, turns around and goes due west for 1.8 km, and finally turns around again and heads 3.7 km due east (east as positive direction).
a) What is the total distance traveled by the whale?
b) What are the magnitude and direction of the displacement of the whale?

2 A student stays 6.0 km from the main road. His school is 12 km from the junction P as shown in figure below.

He takes 10 minutes to travel from his house to junction P, and another 15 minutes from the junction to his school which is 12 km from the junction P as shown. Assume that the student travels with constant speed from the house to the junction P and from the junction P to the school. Calculate the student’s
i. Average speed from his house to the school (ans: 0.72 km/min or 43.2 km/hr)
ii. Average velocity from his house to the school (ans: 32.3km/h)
iii. The change of velocity at the junction


3 Complete the graphs below, by drawing in the missing graphs, where each row represents identical motion:

4 Figure 1 shows the distance of a car along a straight path as a function of time.


i. What is the average speed of the object from time = 0 s to time = 5 s?

ii. What is the instantaneous velocity of the object at time = 16s?
5 The following velocity-time graph represents the movement of a car that was initially travelling towards the East.


(a) At which stage(s) did the car have a constant velocity?
(b) Use the graph to calculate the acceleration from E to F.
(c) Use the graph to determine the displacement of the car between A and C.
(d) Describe the motion of the car from B to C.
6 a. A cyclist accelerates at 0.89 m/s2 during a 5.00 second interval. What is the change in velocity of the cyclist?

b. Starting from rest, a light plane must reach a speed of 30.0 m/s for takeoff. How long a runway is needed if the acceleration is 3.0 m/s2?

c. A uniformly accelerating train passes a green light signal at 7.00 m/s. It passes a second light 125 m farther down the rail track, 12.0 s later. Determine the acceleration of the train.

d. A car traveling 24 m/s on a straight road is brought uniformly to a stop in 10 s. How far does the car travel during that time?

7 A truck on a straight road starts from rest and accelerates at 2.0 m/s2 until it reaches a speed of 20 m/s. Then the truck travels for 20 s at constant speed until the brakes is applied, stopping the truck in a uniform manner in an additional 5.0s.
a. How long was the truck in motion? (ans: 35 s)
b. What is the average velocity of the truck for the motion described? (ans: 15.7m/s)

8 A zebra first sees a lion when the lion is 12.5 m away and moving towards the zebra with a velocity of 5 ms-1. The zebra begins to accelerate away from the lion; at the same time the lion accelerates towards the zebra at 2 ms-2.

(a) If the lion takes 15 seconds to catch the zebra, how far does the zebra travel before it is caught? (4)

(b) What is the zebra’s acceleration, if it’s moving at 38 ms-1 when the lion catches it?

9 An SUV blows through a red light at a constant velocity of 42.5 m/s. At the same instant, a police car at the same red light floors the gas pedal and accelerates at 4.2 m/s2 after the SUV.

a) How long does it take for the police car to overtake the SUV?
b) How far down the road are they when the police car catches up?
c) How fast is the police car going when he catches up to the SUV?
10 A girl throws a ball from the edge of a balcony which is 15.0 m above the ground. She throws it with a velocity of 12.5 m/s vertically upwards and the ball reaches a height of 8.0 m above the balcony, then it falls straight down to the ground.
(a) What is the displacement from where of the ball at maximum height?

(b) What is the displacement of the ball when it on the ground?
(c) What distance does the ball travel?
(d) What is the acceleration of the ball when at maximum height?
(e) What is the acceleration of the ball as it passes the balcony on the way down.
(f) Calculate the final velocity of the ball just as it hits the ground.

11 Zipho throws a ball vertically upward with an initial speed of 15.0 ms-1 to Ntombi who is leaning over a balcony that is 8.0 m above Zipho’s hand. She catches the ball on its way down. Calculate:
a. The velocity of the ball when she catches it.
b. The time taken to reach Ntombi.

TUTO 1 SHF1215

Assalamualaikum everybody...

This is tuto 1 from chapter 1.please try these questions by your own,if there any problems,please let me know,u can write to me via email or through this blog.

U can also download this tutorial in microsoft word(tutorial1A.doc file) at the right side of this blog.

Selamat mencuba..!

TUTORIAL 1A

1. The unit Js-1 can be used as the unit of power instead of watt. Give the derived units and dimensions for each of the following quantities:
a. Work
b. Pressure
c. Frequency
d. Force
e. Momentum

2. For each of the following, convert the measurement into the given units and give your answer in standard scientific notation


640 m = _________________mm
10.08 kg= ________________mg
0.0078 m3 = _________________dm3
0.067 g/cm3 = ______________g/dm3
204.0 kg = ________________ mg
503.8 cm3 = ________________ litres
0.0025 m3 = ________________ dm3
25.9 litres = ________________ kilolitres
60 km/h = _________________ m/s


3. Convert:
a. Speed of 110km/h into mph
b. 16.6 km2 into m2
c. Speed of 36kmh-1 into ms-1
d. Pressure of 20Ncm-2 into Pa (Nm-2)
e. Density of 2.5 gmm-3 into kgm-3
f. Time of 1220 000min-1 into s-1
g. Area of 4.0 in2 into mm2

4. The density, ρ and the pressure, p of a gas are related by the expression
where c and  are constant
i. Determine the base unit of density, ρ.
ii. Show that the base unit of pressure, p are kgm-1s-2 (Hint: p = F/A)
iii. Given that the constant  has no unit, determine the unit c, hence suggest what quantity may be represented by the symbol c.


5. A recent theory suggests that time may be quantized and that the quantum or elementary amount of time, t is given by the equation where h is the Plank’s constant of unit Js, mp is the proton mass and c is the speed of light.
a. Determine the dimension of Plank’s constant, h
b. Show that this equation is dimensionally correct


6. For each of the following calculations give the answer with the correct number of significant figures or decimal places. Do not forget the units.
a. 20.9 mm + 20.9 cm
b. 0.1790 mm2  1.04 mm
c. 1.00  103 g  999.0 cm3
d. 2.528 cm + 93.4 mm ____________________________
e. 9.823 g/cm3 ×6.1×10−3 cm3___________________________
f. 234 m/s ÷ 84 s ____________________________

7. Calculations from measurements made in experiment produce a value for the acceleration due to gravity, g. Following are ways of presenting the value of g. For each of the ways, state and explain whether it is correct.
a. g=(9.821 ± 0.1)ms-2
b. g=(9.82 ± 0.002)ms-2
c. g=(9.8 ± 0.2) ms-2


8. When comparing systematic and random errors, the following pairs of properties of errors in an experimental measurement may be contrasted:
P1: error can possibly be eliminated
P2: error cannot be eliminated
Q1: error is of constant sign and magnitude
Q2: error is of varying sign and magnitude
R1: error will be reduced by averaging repeated measurements
R2: error will not be reduced by averaging repeated measurements

Which properties apply to random errors?

9. A force of 40N acts an angle of 30o to the horizontal plane. What are the horizontal and vertical component of the force?


10. Two vectors a and b are at right angles to each other. Draw vector diagrams to obtain
a. a+b
b. a-b
What are the magnitudes of (a+b) and (a-b) in terms of the magnitudes a and b of the vectors.


11. Figure shows two forces acting at a point O. Find the magnitude and direction of the resultant force.



12. Two forces F1 and F2 of magnitude 15.0 N and 10.0N respectively are applied at point O in figure above. Both forces are inclines at angle 50o to the x-axis.
Calculate:
a. The x and y components of each of the forces
b. The vector sum of the x-components of these forces
c. The vector sum of the y-components of these forces
d. The resultant of these forces (ans:19.5N, 80.5o)

13. Figure above shows four forces acting at a point O. Fill in below table for each force and find the magnitude and direction of the resultant force. (ans: 119 N, 143o)