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A 150 gm cricket ball moving at 20 m/s is caught by a player and the catching process is completed in 0.1 second. The force of blow exerted by the ball on the hands of player is

3 N

8 N

24 N

30 N

While launching a rocket of mass 2 * 104 kg, a force of 5 * 105 is applied for 20 seconds. The velocity attained by the rocket at the end of 20 seconds would be

350 m/s

500 m/s

750 m/s

900 m/s

Two balls of mass 2 kg and 4 kg respectively are connected to the two ends of a spring. The balls are pressed together and placed on a smooth table. When released, the lighter ball moves with an acceleration of 2 m/s2. The acceleration of the heavier ball will be

0.5 m/s2

1 m/s2

2 m/s2

4 m/s2

Two particles with masses in the ratio 1:4 are moving with equal kinetic energies. The magnitude of their linear momentums will confirm to the ratio

1 : 8

1 : 2

4 : 1

The kinetic energy of a body is stated to increase by 300 percent. The corresponding increase in momentum of the body will be

50

100

200

300 percent

If a vector is parallel to another vector then the resultant of the vector will be equal to ____.

A

Zero vector

Zero

/

20

23

26

The angle between the vectors and is ____.

30°

45°

60°

90°

The volume of the parallelepiped whose sides are given by is

4

None of these

Let a=2i+ j-2k and b =i+j. If c is a vector such that a. c=|c|,|c-a|=2 and the angle between (a xb) and c is 30o, then |(a x b) xc|=

2/3

3/2

2

3

3 N

8 N

24 N

30 N

While launching a rocket of mass 2 * 104 kg, a force of 5 * 105 is applied for 20 seconds. The velocity attained by the rocket at the end of 20 seconds would be

350 m/s

500 m/s

750 m/s

900 m/s

Two balls of mass 2 kg and 4 kg respectively are connected to the two ends of a spring. The balls are pressed together and placed on a smooth table. When released, the lighter ball moves with an acceleration of 2 m/s2. The acceleration of the heavier ball will be

0.5 m/s2

1 m/s2

2 m/s2

4 m/s2

Two particles with masses in the ratio 1:4 are moving with equal kinetic energies. The magnitude of their linear momentums will confirm to the ratio

1 : 8

1 : 2

4 : 1

The kinetic energy of a body is stated to increase by 300 percent. The corresponding increase in momentum of the body will be

50

100

200

300 percent

If a vector is parallel to another vector then the resultant of the vector will be equal to ____.

A

Zero vector

Zero

/

20

23

26

The angle between the vectors and is ____.

30°

45°

60°

90°

The volume of the parallelepiped whose sides are given by is

4

None of these

Let a=2i+ j-2k and b =i+j. If c is a vector such that a. c=|c|,|c-a|=2 and the angle between (a xb) and c is 30o, then |(a x b) xc|=

2/3

3/2

2

3

TOPICS: VECTORS,MOMENTUM

Ma'am could you plz assist me in question no.7 i have a problem in questions related to taking out ratios.......

3064 days 17 hours 31 minutes ago

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