+91-93193 64476
FlagBACK
Flag General Physics> pleeeeeeeeeeeease answer this !!!!!...
question mark

A projectile is thrown in the upward direction making an angle of 60 with the horizontal direction with a velocity of 147 m/s. Then what is the time after which its inclination with the horizontal is 45 ?

Mohammed faisal anees , 15 Years ago
Grade 11
anser 2 Answers
vikas askiitian expert

 let after time t its inclination with horizontal is 45

   at this time Vy /Vx =tan45  or Vy =Vx 

    Vx remains constant =147cos60 =Vy 

    now using equation of motion for verticle direction 

   Vy=Uy-gt..........eq1

   Uy=147sin60 ,Uy=147cos60 

 putting in eq 1, 

    t=5.36 sec

 

ApprovedApproved
Last Activity: 15 Years ago
Shriya
Suppose the body is projected with the velocity U at an angle of 60 degree with the horizontal and after time t its velocity becomes we make a angle of 45 degree with the horizontal. equating the horizontal and vertical components of U and v, 
Ucoscos 60 degree equals to b cos 45 degree or b equals to you cos 60 degree upon cos 45 degree
Also we sin 45 degree equals to sin 60 degree minus theta from the equation of motion
You cos 60 degree upon cos 45 degree into sin 45 degree equals to you sin 60 degree minus theta
 
t equals to you upon g sin 60 degree minus cos 60 degree equals to 1 4 7 upon 9.8 into root 3 by 2 minus one by two
Therefore time equals to 5.49 seconds.
 
Last Activity: 7 Years ago
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Other Related Questions on general physics

question mark

 In viewing through a magnifying glass, one usually positions one's eyes very close to the lens. Does angular magnification change if the eye is moved back?

general physics
1 Answer Available

Last Activity: 7 Months ago

question mark
moment of inertia of a equilateral triangle about an axis passing through centre and perppendicular to the plane
general physics
1 Answer Available

Last Activity: 3 Years ago

question mark
. Because of the rotation of the earth, a plumb bob may not hang exactly along the direction of
the earth’s gravitational pull (its weight) but deviates slightly from this direction. Calculate the
deviation (a) at 40 latitude, (b) at the poles, and (c) at the equator
general physics
1 Answer Available

Last Activity: 3 Years ago

question mark
The length of a massless rod is measured using vernier callipers having 10 vernier scale divisions and least count of 0.1 mm. Two masses 1.00 ± 0.01 kg and 4.00 ± 0.02 kg are attached to its ends. If reading of vernier scale is 5 divisions coinciding with 1.3 cm, what is the % error in locating centre of mass from lighter mass
general physics
2 Answers Available

Last Activity: 3 Years ago

question mark
A block is kept on x-y plane at a point (2m,3m). It is pushed with a force of magnitude 10 Ntowards point (5m,7m). The force can be represented as?
general physics
1 Answer Available

Last Activity: 3 Years ago