# For maximum horizontal range, the angle of projection of a projectile should be

1.  300

2.  450

3.  600

4.  900

4

450

Explanation :
No Explanation available for this question

# Two stones are projected with the same velocity but making different angles with the horizontal. If their ranges are equal and the angle of projection of one is 600, then the ratio of the maximum heights attained (y2/y1) will be

1.  3:1

2.  2:1

3.  1:2

4.  1:3

4

1:3

Explanation :
No Explanation available for this question

# A stone is projected horizontally from a cliff at 10 m/sec and lands on the ground below at 20m from the base of the cliff. Find the height h of the cliff Use g= 10m/sec2

1.  18 m

2.  20 m

3.  22 m

4.  24 m

4

20 m

Explanation :
No Explanation available for this question

# Two balls are projected from the same point making angles of 600 and 300 with the verticals axis. If both the balls are to attain the same height, the ratio of the speeds of projectionv1/v2 should be

1.  1:2

2.  1:1

3.  1:√3

4.  √2:1

4

1:√3

Explanation :
No Explanation available for this question

# A planet is an elliptical orbit about a star that sits at one of the foci. At perihelion the orbital velocity is 104 m/sec. At aphelion the orbital velocity is 2.5× 103 m/sec. The ratio of aphelion distance to perihelion distance is

1.  1:4

2.  1:2

3.  2:1

4.  4:1

4

4:1

Explanation :
No Explanation available for this question

# For a projective of range R, the kinetic energy is minimum after the projectile covers a distance equal to

1.  0.25R

2.  0.5R

3.  0.75R

4.  R

4

0.5R

Explanation :
No Explanation available for this question

# If the time of flight of a bullet over a horizontal range R is T seconds, the inclination of the direction of projection with the horizontal is

1.  Tan-1((gT2)/2R)

2.  Tan-1((gT)/2R)

3.  Tan-1((gT2)/4R)

4.  Tan-1((2gT)/R)

4

Tan-1((gT2)/2R)

Explanation :
No Explanation available for this question

# When a jet plane flying at 300 m/sec is at the very top of its trajectory, the apparent weight of a passanger is one half of her actual weight. Find the radius of curvature R of the flight path at this point. Use g= 10m/sec2

1.  22 km

2.  30 km

3.  18 km

4.  16 km

4

18 km

Explanation :
No Explanation available for this question

# A particle is projected at an angle at an angle θ to the horizontal and it attains a maximum height H. The time taken by the projectile to reach the highest point, of its path is

1.  √H/g

2.  √((2H)/g)

3.  √(2H sinθ)/g

4.  √(2H)/sinθ

4

√((2H)/g)

Explanation :
No Explanation available for this question

1.  5m/sec2

2.  4m/sec2

3.  3m/sec2

4.  1m/sec2

4