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A man can swim with a speed of 4.0 km/h in still water. How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0 km/h and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank?
Show that for a projectile the angle between the velocity and the x-axis as a function of time is given by
`theta(t) =tan^(-1) ((v_(0y) - "gt")/v_(o x))`
A bullet fired at an angle of 30° with the horizontal hits the ground 3.0 km away. By adjusting its angle of projection, can one hope to hit a target 5.0 km away? Assume the muzzle speed to the fixed, and neglect air resistance.
Show that the projection angle `theta_o` for a projectile launched from the origin is given by
`theta_o =tan^(-1) ((4h_m)/R)`
Where the symbols have their usual meaning
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?
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?
- Physics Textbook Part - 1 for Class - 11 - 11086