Semester Of Odd-test Remedial Science Class Xi

1. 2. A particle moves along x-axis, of which the position is expressed by x = 5t² + 1, x is in metre ang t is in second. The average velocity in time interval between 2 and 3 second is… m/s2

5

15

25

40

50

2.

The equation of the position vector of a matter is r = (t³ – 2t²)i + 3t²)j. If r is in m and t in s, then magnitude of the matter acceleration exactly after 2 s from the initial observation is …. m/s2

2

4

6

8

10

3. In soccer game, to make the ball reaches the longest distance, it should be kicked with the elevation angle : …….

25

90

45

40

30

4. The circular motion of a VCD complies with the equation w = (-10t + 80) rad/s. If radius of VCD 0,5 meters then the tangential acceleration VCD at t = 2 second is…

1

2

3

4

5

5. An object is dropped from an air plane that is moving horizontally at 720 km/hour at 490 meters altitude. The object will drop at a horizontal distance of …. (assume g = 9,8 m/s²)

1000

2000

2450

2900

4000

6. A worker pushes on object with a horizontal force of 150 N and it moves as far as 5 meters, then the work done is…

750

450

155

145

30

7. An object on earth surface is 100 N in weight. Then the object is carried to a planet with ten times mass of earth, twice radius of the Earth`s radius. Then object weight on the planet surface becomes….

25

50

100

250

500

8. if the gravitational acceleration on the surface of earth is g_o and the earth radius is R, and the gravitational of acceleration at a point of R height from surface of the earth is : ….

1/3

2/3

3/4

1/4

4/3

9. A car has a power 50 kW move with the velocity 20 m/s . Calculate the force of car in that time is

10.000 N

5000 N

2500 N

1000 N

250 N

10. A car with 2000 kg in mass moves at velocity of 10 m/s. The work needed to brake the car until it stops is…. KJ

10

20

30

100

300

450

11. On a free kick in soccer game, the path of the ball reaches its highes point 45 m above the ground How long must the players wait since it is kicked until it falls back the ground, air friction is neglected and g = 10 m/s².

3

4

6

9

10

12. What the spring constant , iit is given force of 400 N, and increases of 4 cm in length

1

10

100

1000

10000

13. As long as the force acting on an object does not exeed the elasticity limit, then besides occurring in spring, the Hooke`s law also occurs in ring inother elastic objects, so that the value of elastic material constant that complies with the Hooke`s law is expressed with equation of….

A Lo/E

E A/ Lo

Lo/AE

L-Lo/EA

EL/xA

14. Sebuah benda dengan massa 2 kg dilempar vertical keatas dengan kecepatan awal 30 m/s, besarnya energy kinetic saat mencapai ketinggian 20m …. J

400

500

600

700

800

15. An object moves is a simple harmonic motion. The deviation is expressed by equation y = 4 sin 0,1 t . The deviation, velocity, and acceleration of the object after moving for 5p seconds each are….

0m; 0,4 m/s; -0,04 m/s2

0m; 4 m/s; -0,04 m/s2

4m; 0,4 m/s; -0,04 m/s2

4m; 0,4 m/s; 0,04 m/s2

-4m; 0,4 m/s; 0,04 m/s2

16. Benda bermasa 2 kg dijatuhkan dari ketinggian 20 m diatas tanah energy potensial benda ketika bergerak 1 sekon adalah : …..

3h

1/3 h

1/4 h

2 h

1/2 h

17. 3. The angle positions of a particle a the edge of a rotating wheel is expressed by q = 4t – 3t² + t³, with q is in radian and at is in second. The angular velocity of the particle at t = 3 second is.

4

6

9

13

15

18. Two objects each of m1= 4 kg and m2 = 9 kg.(see the figure) . a point on the connected line of both object with gravitational field zero then distance of point from a 4kg object is…

0.04

0.10

0.20

0.30

0.4