Question

3. Explain whether the following particular do or don not have acceleration: (a) a particle moving in a 4. Two projects are thrown with the same initial speed, one at an angle θ with respect to the level . Old book, problem 24, new book, problem 32. A fireman 50.0 m away from a burning building straight line with constant speed and (b) a particle moving around with constant speed. ground and the other an angle 90°-8. Both projectiles strike the ground at the same distance from the projection point. Are both projectiles in the air for the same length of time? . If the directs a steam of water from a ground-level fire hose at an angle of 30° above the horizontal speed of stream as it leaves the hose building? is 40 m/s, at what height will the stream of water strike the Old book, problem 25, new book, problem 33. A projectile is launched with an initial speed of 60.0 m/s at an angle of 30° above the horizontal. The projectile lands on a hillside 4.00 s later. Neglect air friction. (a) What is the projectile's velocity at the highest point of its trajectory? (b) What is the 6. straight-line distance from where the projectile was launch to where it hits its target? A river flows due east at 1.50 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.0 m/s due north relative to the water. (a) What is the velocity of the boat relative to the shore? (b) If the river is 300 m wide, how far downstream has the boat moved by the time it reaches the north shore? 7. Extra problems: 8 In ideal projectile motion, when the positive y- axis is chosen to be vertically upward, the y component of the acceleration of the object during the ascending part of the motion a nd the y component of the accelerati on during the descending part of the motion are, respectively, (a) Positive, negative

Answer 1

3)a) When a particle moving in a straight line with constant speed, then there will be no acceleration.

b) When a particle around with constant speed, then there will be radial acceleration.

4) The time of flight = T = 2u*sinθ/g

Where u is the velocity

Now if the one angle is θ and other will be (90- θ) then time will not be same except θ = 45 degree.