A block of mass 120g moves with a speed of 6.0 m/s on a frictionless horizontal surface towards another block of mass 180g kept at rest. the collide and the first block stops. find the speed of the other block after collision.
i wil;l try my level best to solve this
A bullet hits the wall with a velocity of 20 m/s and penetrates it up to the distance of 5 cm. Find the deacceleration/deceleration of the bullet in the wall.
u=2.0m/s
v=0.0m/s
s=5cm=0.05m
a=?
By THE THIRD LAW OF MOTION :
v2=u2+2as
0=400+2*a*0.5
-400=0.1a
a=-400/0.1
a=-4000m/s2
:-The negative sighn represent retardation……………..
a ship moving with the constant acceleration of 36 km/h square in a fixed direction speeds up from 12km/h to 18 km/h. Find the distance traversed by the ship in this period.
i can try to solve this numerical…
Given-
a= 36km/hr square
u= 12km/hr
v= 18km/hr
Solution-
v=u+at
18=12+36t
(18-12)/36 = t
4/36=1/9hr =t
now we know-
s=ut+1/2atsquare
s= 12x1/9+1/2x36x(1/9^2)
=1.5km
distance transvered by the ship is 4.2km
please let me know that my answer is correct or not..
Calculate the work done by a person in lifting a load of 20 kg from the ground and placing it on a 1-m-high table.
A person driving the car at 45 km/h approaches an intersection just as the traffic light turns yellow. he knows the yellow light lasts only 2.0 seconds before turning red and he is 28m away from the near side of the intersection.
A.) Should he try to stop or should she speed up to cross the intersection before the light turns red? The intersection is 15m wide. Her car's maximum deceleration(retardation) is -5.8 m/s^2, whereas it can accelerate from 45 km/hr to 65 km/hr in 6.0 seconds. Ignore length of the car and reaction time.
B.) If speed limit is 50mph and he has a faster car, is there any acceleration that he can do without going over the 50 mph speed limit to get through the red light?
can u solve this i am stumped…….
question for motion is
Q1. the tip of seconds hand of a clock takes 60 seconds to move once on the circular dial of the clock if the radius of the dial of the clock be 10.5 cm calculate the speed of the tip of the seconds hand of the clock (given pie =22/7
question for force and laws of motion is
Q2. the velocity of a body of mass 10 kg increases from 4m/s to 8m/s when a force acts on it for 2 seconds
(a) what is the momentum before the force acts ?
(b) what is the momentum after the force acts ?
(c) what is the gain in momentum per second ?
(d) what is the value of the force ?
last question for gravitation
Q3. when a golf ball is lowered into a measuring cylinder containing water the water level rises by 30 cm raise to the power 3 when the ball is completely submerged if the mass of ball in air is 33 kg find its density
here are some numericals that can help you to prepare yourself for sa1..
1. Imagine that you are visinting planet Mars. You want to record your weight in a notebook on this planet.If your weight on the earth is 450N, what would you record as your weight on the Mars? Take g= 10m/s-2
Friends here is an intresting question to you. hope you solve it………………..
;—A boy runs for 10 min at a uniform speed of 9 km/h . At what speed he run for the next 20 min so that the average speed comes to 12 km/h ?
here"s another question for you all…………………….
;-A force f1 acting on a 2.0-kg body produces an acceleration of 2.5 m/s2.another force f2 acting on a 5.0-kg body produces an acceleration of 2.0m/s2.find the ratio f1/f2.(m/s2 where 2 means square)
here's another question……………………..
Question ;- A 2.4 kg wood block is launched up a wooden ramp that is inclined at a 40 angle. The block's initial speed is 9 m/s. (Use k = 0.20 for the coefficient of kinetic friction for wood on wood.) (a) What vertical height does the block reach above its starting point? (b) What speed does it have when it slides back down to its starting point?
here's another questions for your preparation of SA-1…………………..
Question ;- an engine of mass 8000kg exerts a force of 40000n on tthe 5wagons mass of each is 2000kg. track offers a frictional force of 5000n. calculate the net accelerating force acceleration of the train force of wagon 1on wagon 2???
raj this question was done by sir in the class. but you will know this only if you will pay attention in the class…
