dear xperts anser soon-
at what height from the earth's surface the accleration due to gravity will be half the value of g at the surface ?
what is MOMENTUM? explain in detail
when is it possible to have INCREASING velocity with DEACREASING acceleration? explain eith an example in detail
how is it possible to have increasing velocity and decreasing acceleration? give example.
and reverse of it also
please xplain about qualitative definition of momentum ??
why are road accidents at high speeds more dangerous thna accidents at low speeds ??
A train starts from rest & accelerates uniformly at a rate of 2m/s/s for 10s.It then maintains a constant speed for 200s.The brakes are then applied& the train is uniformly retarded & comes to rest in 50s.FIND;1.the maximum velocity reached, 2.the retardation in the last 50s.3.the total distance travelled and 4.the average velocity of the train.
what do you mean by dimension?and can you please explain in detail what is 3 dimensional figure or a 4 dimentional figure?
A train starts from rest and accelerates uniformly at 2m/s^2 for 10 sec.It then maintains the constant speed for 200 sec. The brakes are then applied and the train is uniformly retarded and comes to rest in 50 sec.Find:(i)maximum velocity reached(ii)retardation in last 50 sec(iii)the total disrance travelled and (iv)the average velocity of the train
i didn't understand how you derieved the equations (both of them)
what is a slope?
is the formula for retarsation the same ?
A space craft flying in a straight course with a velocity of 75km/s fires its rocket motors for 6.0 s. At the end of this time its speed is 120 km/s in the same direction. Find: (i) the space craft's average acceleration while the motors were firing, (ii) the distance travelled by the space craft in the first 10 s after the rocketmotors were started, the motors having been in action for only 6.0 s.
how do we calculate the slope of velocity -time graph when the line goes in the 4th quadrant ??
xperts please xplain this xtract taken from a book...
"......let us consider that a particle is dropped from the top of a tower. let us consider the vertical direction as Y-axis, we have 2 choices for positive Y axis. along vertical upward or verical downward. (xplain how ??)........if we take upward as postive Y axis then a = -g (how???)......and if downward is taken as positive then a = +g
so for the above considered case equations of motion will be-
v = 0 - gt = -gt (how did it come ?)
y = 0 - 1/2 gt^2 = - gt^2/2 ..(how did it come ??, why have we taken s= y and not s = -y )
v^2 = 0 - 2g(-y) = 2gy (why hav we considered here s= -y n not s = y ??)
dear xperts anser soon-
at what height from the earth's surface the accleration due to gravity will be half the value of g at the surface ?
what is MOMENTUM? explain in detail
when is it possible to have INCREASING velocity with DEACREASING acceleration? explain eith an example in detail
how is it possible to have increasing velocity and decreasing acceleration? give example.
and reverse of it also
please xplain about qualitative definition of momentum ??
why are road accidents at high speeds more dangerous thna accidents at low speeds ??
A train starts from rest & accelerates uniformly at a rate of 2m/s/s for 10s.It then maintains a constant speed for 200s.The brakes are then applied& the train is uniformly retarded & comes to rest in 50s.FIND;1.the maximum velocity reached, 2.the retardation in the last 50s.3.the total distance travelled and 4.the average velocity of the train.
what do you mean by dimension?and can you please explain in detail what is 3 dimensional figure or a 4 dimentional figure?
A train starts from rest and accelerates uniformly at 2m/s^2 for 10 sec.It then maintains the constant speed for 200 sec. The brakes are then applied and the train is uniformly retarded and comes to rest in 50 sec.Find:(i)maximum velocity reached(ii)retardation in last 50 sec(iii)the total disrance travelled and (iv)the average velocity of the train
i didn't understand how you derieved the equations (both of them)
what is a slope?
is the formula for retarsation the same ?
A space craft flying in a straight course with a velocity of 75km/s fires its rocket motors for 6.0 s. At the end of this time its speed is 120 km/s in the same direction. Find: (i) the space craft's average acceleration while the motors were firing, (ii) the distance travelled by the space craft in the first 10 s after the rocketmotors were started, the motors having been in action for only 6.0 s.
how do we calculate the slope of velocity -time graph when the line goes in the 4th quadrant ??
xperts please xplain this xtract taken from a book...
"......let us consider that a particle is dropped from the top of a tower. let us consider the vertical direction as Y-axis, we have 2 choices for positive Y axis. along vertical upward or verical downward. (xplain how ??)........if we take upward as postive Y axis then a = -g (how???)......and if downward is taken as positive then a = +g
so for the above considered case equations of motion will be-
v = 0 - gt = -gt (how did it come ?)
y = 0 - 1/2 gt^2 = - gt^2/2 ..(how did it come ??, why have we taken s= y and not s = -y )
v^2 = 0 - 2g(-y) = 2gy (why hav we considered here s= -y n not s = y ??)