Mechanics | Relativity Answers

A gardener waters the plants by a pipe of diameter 1 mm. The water comes out from the pipe at
the rate of 10 cm3/sec. The reactionary force exerted on the hand of the gardener is :

How far will a car travel while it accelerates for 3.2 seconds at a rate of 2.5m/s^2 if it's velocity is 9.8 m/s?

How many revolutions per minute would a 26m -diameter Ferris wheel need to make for the passengers to feel "weightless" at the topmost point?

A circular platform is mounted on a frictionless vertical axle. Its radius R=2 m and its moment of Inertia about the axle is 200 Kg m^2 .It is initially at rest. A 50 kg man stands on the edge of the platform and begins to walk along the edge at the speed of 1 m/s relative to the ground. Time taken by the man to complete one revolution is
1) π s
2) 3π/2 s
3) 2π s
4) π/2 s

what do you mean by conservative forces?An elevator weighing 400 kg is to lifted up at a constant velocity of 3cm s-1,what would be the minimum power of the motor to be used?

a heavy ball with a mass of 3.5 kg is observed to accelerate at a rate of 6.0 m/s ^2. What is the size of the net force acting on this ball?

a car of 1000kg moves up a hill inclined at 30degree to the horizontal.if the total frictional force is 100N.find the force if the car is accelerating at 2m/s

A 125 cm long string has a mass 2.0 g and it is stretched with a tension of 7.0 N between
fixed supports. What is the speed of the transverse wave on the string?

Standing waves are produced by the superposition of two waves given by
y1 (x, t) = 0.2 sin p (t − 2x) m
and y2 (x, t) = 0.2 sin p (t + 2x) m
(i) Obtain the resultant displacement of the particle at x at time t. (ii) At what value of x is
displacement zero at all times. (iii) What is the distance between two nearest values of x
at which the displacement is zero. Is it related to wavelength?

A sinusoidal wave is described by
y (x, t) = 4.0 sin (4.20x − 5.95t) cm
where x is the position along the wave propagation. Determine the amplitude, wave
number, wavelength, frequency and velocity of the wave.