|
A cricketer can throw a ball to a maximum horizontal distance of 100 m. How much high above the ground can the cricketer throw the same ball?
|
|
1
|
12234
|
October 18, 2017
|
|
(i) Prove that maximum horizontal range is four times the maximum height attained by projection, (ii) Find the angle of projection at which the horizontal range and maximum height are equal
|
|
0
|
3242
|
August 18, 2016
|
|
For a angular projection given to a projectile, find : (i) Maximum height, (ii) Time of flight, (iii) Horizontal range
|
|
0
|
6434
|
August 18, 2016
|
|
A machine gun is mounted on the top of a tower 100 m high. At what angles should the gun be inclined to cover a maximum range of firing on the ground below ? The muzzle speed of bullet is 150 m/s. Take g = 10 m/${{s}^{2}}$
|
|
0
|
8265
|
August 18, 2016
|
|
A particle has displacement equation
|
|
1
|
3195
|
August 18, 2016
|
|
An aircraft executes a horizontal loop of radius 1.00 km with a steady speed of 900 km/h. Compare its centripetal acceleration with the acceleration due to gravity
|
|
0
|
4627
|
August 18, 2016
|
|
A stone tied to the end of a string 80 cm long is whirled in a horizontal circle with a constant speed. If the stone makes 14 revolutions in 25 s, what is the magnitude and direction of acceleration of the stone?
|
|
0
|
6797
|
August 18, 2016
|
|
The ceiling of a long hall is 25 m high. What is the maximum horizontal distance that a ball thrown with a speed of 40 m${{s}^{-1}}$ can go without hitting the ceiling of the hall?
|
|
0
|
6751
|
August 18, 2016
|
|
If both the speed of a body and radius of its circular path are doubled, what will happen to the centripetal acceleration?
|
|
0
|
1953
|
August 18, 2016
|
|
Why is earth flat at poles and bulged out at, equator?
|
|
0
|
2338
|
August 18, 2016
|
|
Two bodies are thrown with the same initial velocity at angle 0 and (90° - 0) to the horizontal. Determine the ratio of the maximum heights reached by the bodies
|
|
0
|
6223
|
August 18, 2016
|
|
A projectile is fired at an angle 0 with the horizontal with velocity v. Derive the expression for maximum height attained by it
|
|
0
|
10223
|
August 18, 2016
|
|
In long jumping, does it matter how high you jump ? What factors determine the span of the jump?
|
|
0
|
5695
|
August 18, 2016
|
|
How should a man cross the river in order that he takes (i) shortest time and, (ii) shortest path?
|
|
0
|
13567
|
August 18, 2016
|
|
A railway carriage moves over a straight track with acceleration a. A passenger in the carriage drops a stone. What is the acceleration of the stone w.r.t. the carriage and the earth?
|
|
0
|
7268
|
August 18, 2016
|
|
A horizontal stream of water leaves an opening in file side of a tank
|
|
1
|
2166
|
August 18, 2016
|
|
A body is thrown with a velocity v from a tower of height H. After how much time and at what distance from the base of the tower will the body strike the ground?
|
|
0
|
2371
|
August 18, 2016
|
|
Two bombs of 5 kg and 10 kg are thrown from a tower with the same velocity in the same direction, (i) Which bomb will reach the ground first?(ii) If the bombs are thrown in the same direction with different velocity. What would be the effect?
|
|
0
|
7617
|
August 18, 2016
|
|
Prove that the horizontal range is same when angle of projection is (i) greater than 45° by certain value, and (ii) less than 45° by the same value
|
|
0
|
11221
|
August 18, 2016
|
|
Person sitting in a moving train throws a ball vertically upwards
|
|
1
|
13361
|
August 18, 2016
|
|
A ball is thrown horizontally and at the same time another ball is dropped from the top of a tower - with same velocity
|
|
1
|
12304
|
August 18, 2016
|
|
What are the characteristics of the motion of an earth satellite revolving around it in a fixed orbit?
|
|
0
|
592
|
August 17, 2016
|
|
A bomber in horizontal flight drops a bomb when it is just above the target. Explain whether the bomb hits the target or misses it ? Explain
|
|
0
|
3036
|
August 17, 2016
|
|
A body of mass m is thrown with velocity v at angle 30° to the horizontal and another body B of the same mass is thrown with velocity v at an angle of 60° to the horizontal, find the ratio of the. horizontal range and maximum height of A and B
|
|
0
|
16044
|
August 17, 2016
|
|
A skilled gunman always keep his gun slightly tilted above the line of sight while shooting. Why?
|
|
0
|
8855
|
August 17, 2016
|
|
Define frequency and time period
|
|
0
|
5729
|
August 17, 2016
|
|
Is circular motion possible at constant speed or at constant velocity ? Explain
|
|
0
|
1820
|
August 17, 2016
|
|
A stone dropped from the window of a stationary railway carriage takes 2 seconds to reach the ground. In what time the stone will reach the ground when the carriage is moving with (a) constant velocity of 80 km. (b) constant acceleration of 2 m?
|
|
0
|
4970
|
August 17, 2016
|
|
Even when rain is falling vertically downwards the front screen of a moving car gets wet. On the other hand the back screen remains dry. Why?
|
|
0
|
4023
|
August 17, 2016
|
|
On a rainy day, the rain was falling vertically with a speed of 30 m
|
|
1
|
2084
|
August 17, 2016
|