Diagnostic Exam Review Phy10 (5)

8/10/2019 Diagnostic Exam Review Phy10 (5)

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PHY1008-01-13

by fmn


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1. A plane is headed due east with air speed of

240 kph. If a wind of 40 kph is blowing from thenorth, find the ground speed of the plane.

a. 423 kph b. 243 kphc. 200 kph d. 240 kph


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2.An automobile accelerates at a constant rate of

15 mi/hr to 45 mi/hr in 15 seconds while traveling

in a straight line. What is the average

acceleration?

a. 2.39/ b. 22/

c. 2.12/ d. 2.93/


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3. A 50 kg block of wood rests on the top of the

smooth plane whose length is 3m and whosealtitude is 0.8m. how long will it take for the block

to slide to the bottom of the plane when released?

a. 2.41 secs b. 1.51 secs

c. 2.51 secs d. 2.14 secs


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4. Determine the angle of super elevation for a 200m highway curve so that there will be no side

thrust at a speed of 90 kph.

a. 17.67 degrees b. 19.17 degrees

c. 18.32 degrees d. 20.11 degrees


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5. A load of 100 lb is hung from the middle of the

rope which is stretch between two rigid wall 30 ft

apart. Due to the load, the rope sags 4 ft in the

middle. Determine the tension in the rope.

a. 173 lbs b. 165 lbs

c. 194 lbs d. 149 lbs


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6. A 5.0-kg rock is dropped from rest down a vertical

mine shaft. How long does it take for the rock toreach a depth of 79 m? Neglect air resistance.

a. 2.8 s b. 4.0 s c. 4.9 s d. 8.0 s


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7.A rotating wheel has a radius of 2 ft and 6 in. Apoint on the rim of the wheel moves 30 ft in 2 sec.Find the angular velocity of the wheel.

a. 4 rad/sec b. 2 rad/secc. 6 rad/sec d. 5 rad/sec


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8.A 2.00-kg box, initially at rest, is pulled through a

distance of 5.00m across a level floor by a 10.00-N force applied parallel to the floor. The

coefficient of friction between the floor and the box

is 0.25. What is the speed of the box at the end of

5.00 m?

a. 8.67 m/s c. 6.72 m/s

b. 5.05 m/s d. 9.90 m/s


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9. What is the magnitude of the net force acting on a

2000-kg car as it accelerates from rest to a speedof 20 m/s in 5 s?

a. 1000 N c. 4000 N

b. 2000 N d. 8000 N.


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10.A toy cart at the end of a string 0.70 m long

moves in a circle on a table. The cart has a

mass of 2.0 kg, and the string has a breaking

strength of 40 N. The maximum speed of the

cart is approximately

a. 1.9 m/s b. 3.7 m/s

c. 11.7 m/s d. 16.7 m/s


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11. If the earth were three times farther from the

sun than it is now, the gravitational force

exerted on it by the sun would be

a. three times as large as it is now

b. nine times as large as it is nowc. one-third as large as it is now

d. one-ninth as large as it is now


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12. A woman whose mass is 60 kg on the earths

surface is in a spacecraft at a height of twicethe earth radius (2 earth radii) above the earths

surface. Her mass there is

a. 6.7 kg c. 20 kgb. 15 kg d. 60 kg


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13. A woman whose mass is 60 kg on the earths

surface is in a spacecraft at a height of twice the

earth radius (2 earth radii) above the earthssurface. The acceleration due to gravity at the

womanslocation is

a. 1.08 / b. 2.45 /

c. 4.9 / d. 9 8 /


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14. A 200-kg satellite circles the earth in an orbit 7.0

x 106m in radius. At this altitude g = 8.2 m/.The speed of the satellite is

a. 38 m/s b. 850 m/s

c. 7600 m/s d. 7900 m/s


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15. Assuming that the radius of earth is 6400 km, at

what rpm should an object rotate around theearth so that it would seem weightless?

a. 0.0318 rpm b. 0.0118 rpm

c. 0.0218 rpm d. 0.0418 rpm


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16. A baseball is thrown from a horizontal plane

following a parabolic path with an initial velocity

of 100 m/s at an angle of 30above thehorizontal. How far from the throwing point will

the ball attain its original level?

a. 883 m c. 880 m

b. 890 m d. 875 m


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17. A ball is whirled in a horizontal circle 1.5m in

radius at a rate of 1 revolution every 2 seconds.Find the centripetal acceleration of the ball in

/.

a. 8.8 c. 12.8b. 10.8 d. 14.8


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18. A stone is thrown upward at an angle of 20

with the horizontal and it lands 75 m

measured horizontally and 3 meters above

measured vertically from its point of release.

Determine the initial velocity of the stone in

m/s.

a. 22.56 b. 27.46

c. 31.62 d. 35.84


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19. The coefficient of static friction between a cars

tire and a concrete road is 1.0 when the road isdry and 0.7 when the road is wet. If the car can

safely make a turn at 50 kph on a dry day, what

is the maximum velocity on a rainy day?

a. 35kph b. 37.5kph

c. 40 kph d. 42 kph


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20. A typical commercial jet airliner needs to reach a

speed of 200 knots before it can take off. ( A

knot is a nautical mile per hour and is verynearly equal to half a meter per second.) If such

plane spends 25 s on the runway, what is its

acceleration in /?

a. 2b. 4

c. 3

d. 5

21. What is the minimum runway length?

a. 1150 m

b. 1250 m

c. 1350 m

d. 1450 m


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22. For the concurrent forces shown,

10 kN

15 kN

50 kN

50 30

45

y-axis

X-axis

Which of the following gives the

value of the vertical component

of resultant force in kN?

a. 26.7b.35.1c. 42.1d.22.7


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23. For the concurrent forces shown,

10 kN

15 kN

50 kN

50 30

45

y-axis

X-axis

Which of the following gives the

value of the angle of the resultant

force from the x-axis in degrees?

a. 54.3b.36.9c. 35.7

d.56.3


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kjiA 45

kjiB 32

kjiC 474

For items 24 and 25, Given three vectors A, B, C:?

24

25

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Diagnostic Exam Review Phy10 (5)

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