575 - Physics Questions Answers
A particle a having a charge of 5.0×10
is fixed in. a vertical wall. A second particle B of mass 100 g and. having equal charge is supended by a silk thread. of length 30 cm form the wall. The point of suspension is. 30 cm above the particle A. Find the angle of the thread. with the vertical when it stays in equilibrium.
a toy car of mass 500g travels with a uniform velocity of 25m/s for 5 seconds, the brakes are then applied and the car is uniformly retarded and comes to rest in further 10s calculate the retardation
use v = u + at
u = 25, v = 0 and t = 10
Hi please slove these question also...
A ) Two particles of mass 3 kg and 4 kg are connected by a light inelastic string passing over a smooth fixed pulley. The system is released from rest with the string taut and both particles at a height of 2 m above the ground. Find the velocity of the 3 kg mass when the 4 kg mass reaches the ground, and find when the 4 kg mass reaches the ground.
B) Briefly describe an experiment to find the coefficient of friction between brick and tile. You may assume access to a tile slab, a number of bricks and basic scientific equipment, such as a pulley, weighing machine, etc.
Please reply ASAP...Waiting for your reply.
(A)4g-T = 4a
T-3g = 3a
solve for a
use h = 0t+1/2at2 for getting t
and v = 0 +at for v
(B) get F applied and acceleration of the body
then use F-kmg = ma
for getting k (coefficient of friction)
Please slove the below mention question:
A) A uniform ladder of weight w rests on rough horizontal ground against a smooth vertical wall. The vertical plane containing the ladder is perpendicular to the wall and the ladder is inclined at an angle θ to the vertical. Prove that, if the ladder is on the point of slipping and µ is the coefficient of friction between it and the ground, then tanθ = 2µ
B) Two particles of mass 3 kg and 4 kg are connected by a light inelastic string passing over a smooth fixed pulley. The system is released from rest with the string taut and both particles at a height of 2 m above the ground. Find the velocity of the 3 kg mass when the 4 kg mass reaches the ground, and find when the 4 kg mass reaches the ground.
C) A box of mass 14 kg is placed in the back of a van. The coefficient of friction between the box and the floor is 0.5. What happens to the box if the lorry moves off with an acceleration of
(a) 4 ms-2
(b) 5 ms-2
(c) 8 ms-2
(Take g = 10 ms-2)
Can i get answer before 3pm today. Please i request you to help me out from the issue...
(a)let R and N are reactions by the ground and wall then for equilibrium
μR = N
R = w
and about ground point
N*lcosθ = w*lsinθ/2
now solve
(b) 4g-T = 4a
T-3g = 3a
solve for a
use h = 0t+1/2at2 for getting t
and v = 0 +at for v
(c) for a = 8 pseudo force = 14*8 and friction max = 0.5*14*10 so box will fall in backward direction
A 50 kg gymnast falls freely from a height of 4 m on to a trampoline. The trampoline then bounces her back upward with a speed equal to the speed at which she first struck the trampoline. What is the average force the trampoline applies on the gymnast ?
A) 50 N B) 200 N C) 500 N D) 2000 N E) more information is required
rain is falling down vertically 2m/s. a person is walking with velocity 2m/s on horizantal road. the angle made by the umbrella with vertical to protect from rain is
a block of mass m is pushed up a movable incline of mass nm and height h.All surfaces are smooth without friction.what must be the minimum value of u so that the block just reaches the top of the movable incline.
let velocity of m at start is u along horizontal
at the top horizontal velocity of system = u/(n+1) and vertical velocity = 0
by energy conservation 1/2 mu2 = 1/2 (nm+m) {u/(n+1)}2 + mgh
solve
A solid sphere is subjected to uniform pressure from all direction. The ratio of volumetric strain to lateral strain produced in it, is
V = 4/3 πr3
so dV = 4πr2
now calculate dV/V
What is the length of a wire whose density is 8 g/cm3, which suspended vertically, would break due to its own weight? [Breaking stress of wire is 2.4 x 108 N/m2]
use stress = force/area
When a load of 8 kg is hung on a wire, then extension of 3 cm takes place, the work done by internal forces of wire is