Download PHY 30S Review Questions Name - Westgate Mennonite Collegiate

Grade 11 Physics – Course Review 5
Kinematics
For questions 1 to 4 choose from the following list of choices:
(A) nothing (B) position (C) displacement (D) velocity (E) change in velocity
(F) acceleration
1.
2.
3.
4.
5.
The slope of a d-t graph gives what?
The area under the d-t curve gives what?
The slope of a v-t graph gives what?
The area under the v-t curve gives what?
The area under an a-t graphs gives what?
6. An object initially moving at 10 m/s accelerated to 40 m/s in 20 seconds.
a. What was its average velocity?
b. How far did it move?
c. What was its acceleration?
7. A jet initially moving at 120 m/s accelerated at 15 m/s2 for 10 seconds.
a. What was its new velocity?
b. How far had it flown in those 10 seconds?
8. A car going 5 m/s accelerated at 0.25 m/s2 over a distance of 150 m in 20s.What
was the new velocity of the car?
9. A boat has a velocity of 18 km/h [N 35o W]. What are the components of its
velocity?
10. An object ended up 25 m [S] and 40 m [E] of its starting point. What was its
displacement?
11. An object initially moving at 15 m/s [N] had an acceleration of 2.0 m/s2 [S] for
5.0 seconds.
a. What was its change of velocity?
b. What was its new velocity?
12. Use the a-t graph on the right to answer
the following questions. Assume that positive
is North and negative is South and at t = 0s, the
object is moving at 4.0m/s [North].
a. What happens between 0 – 5s?
b. What is the change in velocity between
5 – 11s?
c. What is the velocity after 11s?
d. What is the acceleration between 5 – 11s?
1
L. Mann
PHY30S
13. From this v-t graph draw the d-t and a-t graphs. Assume the initial position is d =
5.0 m
d
(m)
V (m/s)
20
15
10
5
0
-5
1
2
3
4
5
6
7
8
9
10
1 1
1 2
1 3
-10
-15
-20
a
(m/s2)
2
L. Mann
PHY30S
1 4
t(s)
Dynamics
14. State Newton’s three laws of motion.
15. A force of 50 N makes an object accelerate at 0.40 m/s2. What acceleration would
a force of 200 N produce?
16. A force of 500 N made a mass accelerate at 0.80 m/s2. What force would produce
an acceleration of 3.2 m/s2?
17. A certain force can make a mass of 5 kg accelerate at 2.0 m/s2. What acceleration
could the same force give a mass of 20 kg?
18. A certain force made a mass of 60 kg accelerate at 0.60 m/s2. The same force
gave another object an acceleration of 1.8 m/s2. What is the mass of the second
object?
19. A 40.0 kg mass was initially moving at 6.0 m/s when a horizontal net force of 20
N acted on the mass for 8.0 seconds.
a. What was the acceleration of the mass?
b. What was the change of velocity of the mass?
c. What was the new velocity of the mass?
d. How far did the mass move while the force was acting?
20. A horizontal applied force of 200 N [E] acting on a 100 kg mass initially at rest
could only give the mass a velocity of 3.0 m/s [E] after acting for 10 seconds
because there was some friction also acting.
a. What was the actual acceleration of the mass?
b. How much friction was also acting on the mass?
21. A 65 kg person is standing on a force scale that reads in Newtons.
a. What is the mass of the person?
b. What is the weight of the person?
22. A 60 kg person is standing in an elevator on a scale that measures Newtons. What
does the scale read in each case for parts (A) to (E)?
a. The elevator is at rest?
b. The elevator has an upward acceleration of 0.80 m/s2.
c. The elevator has a steady upward velocity of 1.2 m/s.
d. The elevator has a downward acceleration of 0.6 m/s2.
e. The elevator has a steady downward velocity of 1.5 m/s.
23. Continue question 19, but now the scale reads 500N.
a. What is the acceleration of the elevator?
b. If the scale reads 680 N, what is the elevator doing?
c. If the scale reads 588 N, what is the scale doing? Give TWO possibilities.
3
L. Mann
PHY30S
24. A 50 kg mass is on a level surface where the coefficient of static friction is 0.40
and the coefficient of kinetic friction is 0.35. What horizontal applied force is
required to make the mass start to move?
25. Continue question 21, but with an applied force of 250 N acts on the mass. What
is the resulting acceleration of the mass?
26. A 75.5kg object had a coefficient of drag of 0.16.
a. What is its terminal velocity?
b. Find its acceleration if it is falling at:
i. 10.0m/s
ii. 77m/s
iii. 68.0m/s
27. An object with a mass of 4.0kg was found to have a terminal velocity of 34m/s.
What is its coefficient of drag?
28. A 3.0kg mass has a coefficient of drag of 0.050.
a. What is its terminal velocity?
b. If it is falling at 18.0m/s (use this velocity for parts b – d), what is the
force of air resistance on the mass?
c. What is the net force on the mass?
d. What is the acceleration of the mass?
Electric Fields
29. Convert the following:
a. 6.2μC to ec
b. 7.36 x 1015ec to C
c. 18.3N/C to N/ec
d. 1.73 x 102 N/ec to N/C
e. 3.20 x 10-7 N/μC to N/ec
30. A charge of +5.0 x 1012 ec is in an electric field of 2 000 N/C [Left].
a. express the charge in C and µC.
b. What force does the charge have?
31. Draw the electric field diagrams for the following:
a)
+
+
b)
+
-
+
+
+
-
-
-
c)
32. In a Millikan type experiment, an oil drop with a mass of 1.76 x 10-15 kg was held
in balance by an electric field of 27 000 N/C [up].
a) What is the weight?
b) What is the electric force?
c) Is the charge positive or negative?
d) What is the charge in C?
e) How many electrons did the drop gain/lose?
4
L. Mann
PHY30S
Magnetic Fields
33. Draw the magnetic field for each situation, showing its shape and direction.
a)
b)
S
N
N
S
b) Which way is B?
34. a) Which way is the force?
F
N
I
S
I
I
35. Calculate the force (and direction) on the wire if 20 cm is in a
field of 1.8 T and there is a current of 12 A.
N
S
36. For the following questions, be sure to calculate the magnitude
and direction:
a. The current through a wire that is 90cm long is 6.0A [N]. The wire is in a
0.50T [61° E of N] magnetic field. What is the magnitude and direction of
the force on the wire?
b. A wire that is 0.50m long and carrying a current of 9.0A [36° NW] is in a
magnetic field of 0.70T [W]. What is the magnitude and direction of the
force acting on the wire?
Waves
37. A transverse wave source makes 16 waves in 4 seconds. Two crests, with 3 other
crests between them, are 20 cm apart.
a) Draw a diagram of part of it and label a crest (C), trough (t), wavelength
() and amplitude (A).
b) Calculate the period, T.
c) Calculate the frequency, f.
d) Calculate the wavelength, .
e) Calculate the velocity, v.
5
L. Mann
PHY30S
38. Draw the reflected pulse in each case.
a)
fixed end
b)
free
end
39. Draw the reflected pulse after the wave reaches the barrier.
40. Draw the transmitted and reflected pulses in each case:
(a)
(b)
light
heavy
heavy
light
41. The waves are going down the page from deep to shallow. The wavelength in the
deep water is 8cm.
a) Draw the waves in the shallow sections.
b) The frequency is 4 waves/second in the deep
Deep
section. What will the frequency be in the
shallow section?
c) What is the angle of refraction, if the speed on
the deep side is 4.0m/s and on the shallow side
is 2.5m/s?
6
L. Mann
PHY30S
450
42. Draw the wave patterns beyond the object(s) in each case.
a)
b)
43. Determine the resulting wave shape in each case.
a)
b)
44. a) Label and define the nodes and
antinodes in this standing wave.
b) What is the wavelength of the
waves producing this pattern?
c) What # harmonic frequency is this?
8.0m
45. Person A & B are about 500 m apart. They are hearing sounds produced by the
same object (which is on a line between them), but person A hears a higher
pitched sound than what person B hears. From this they conclude that the object is
moving. With reference to person A & B, what direction is the object travelling?
46. Look at the diagram below to answer the given questions:
P1
S1
S2
a) Draw in all the nodal lines.
b) What would be the distance between the triangle and the source S2 if the
wavelength of the waves is 1.5 cm?
c) Calculate the wavelength of the waves by using P1 and
│PnS1 – PnS2│= (n – ½)λ .
d) A point on a nodal line has a path difference of 3½ λ. Which nodal line is it
on?
7
L. Mann
PHY30S
47. In a double slit experiment, a laser with a wavelength of 442nm is used and the screen
is positioned 2.50m away from the slits. The distance from the centre bright band to
the second band on the left side is 155mm. What is the slit separation?
48. A double slit experiment is performed to measure the wavelength of light. The slits
are 0.0340mm apart. A screen is placed 0.400m away and the distance from the
centre band to the next band on the right is 32.1mm. What is the wavelength of the
light?
Grade 11 Physics – Final Exam Review Answers
Kinematics
1. D
2. A
3. F
4. C
5. E
6. (a) 25m/s
(b) 500m
(c) 1.5m/s2
7. (a) 270m/s
(b) 1950m
8. 10m/s
9. vx = 14.745km/h [W] and vy = 10.324km/h [N]
10. 47.2m [32°SE]
11. (a) 10m/s [S]
(b) 5m/s [N]
12. (a) no acceleration (not moving or constant velocity) (b) 42 m/s [N] (c) 46m/s [N] (d) 7m/s2
8
L. Mann
PHY30S
13.
Dynamics
14. See notes
15. 1.6m/s2
16. 2000N
17. 0.5m/s2
18. 20kg
19. (a) 0.5m/s2
(b) 4m/s (c) 10m/s
2
20. 0.3m/s [E]
(b) 170N [W]
21. (a) 65kg (b) 637N
(d) 64m
9
L. Mann
PHY30S
22. (a) 588N(b) 636N
23. (a) 1.47m/s2 [down]
(c) 588N(d) 552N
(e) 588N
(b) accelerating upward, 1.53m/s2
(c) moving at a constant velocity no not moving
24. 196N
25. 1.57m/s2
26. (a) 68.0m/s
(b) i. -9.6m/s2
27. 0.0339
28. (a) 24.2m/s
(b) 16.2N [up]
Electric Fields
29. (a) 3.9 x 1013ec (b) 0.00118C
(e) 5.12 x 10
-20
ii. 2.8m/s2
iii. 0m/s2
(c) 13.2N [down] (d) 4.4m/s2 [down]
(c) 2.93 x 10-18N/ec
(d) 1.08 x 1021N/C
N/ec
30. (a) 8.0 x 10 C, 0.8 µC
31.
-7
(b) 0.0016 N [Left]
32. (a) 1.71 x 10-14 N [down] (b) 1.71 x 10-14 N [up]
(d) 6.4 x 10-19 C
(c) positive
(e) 4 lost
Magnetic Fields
33.
a)
b)
34.
35. 4.32 N [out of the page]
36. (a) 2.4N [down] (b) 1.9N [up]
Waves
37. (a) See Notes
(b) 0.25 s
38. (a)
(c) 4 waves/sec
(d) 5 cm (e) 20 cm/s
(b)
Normal
39.
Reflected
Pulse
Өi ӨR
Өi = ӨR
10
L. Mann
PHY30S
transmitted
transmitted
40. (a)
(b)
reflected
reflected
41. (a)
(b) 4 waves/second
42. a)
(c) 26°
b)
a) b)
b)
43.
44. (a)
(b) 5.3m
(c) 3rd
45. Person A hears a higher pitched sound (high
frequency) so the source of the sound is moving
towards person A.
46. (a)
(b) 3.0cm
(c) 0.6cm
(d) n = 4
47. 1.43 x 10 m
48. 2.73 x 10-6 m
-5
11
L. Mann
PHY30S