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A 68.5-kg skater moving initially at 2.40 m/s on rough horizontal ice comes to rest uniformly in 3.52 s due to friction from the ice. What force does friction exert on the skater?
Two sinusoidal waves travel in the same direction with the same amplitude, wavelength, and speed. Their resultant wave function is given by: y(x,t) = Ares sin(kx-ωt+π/4). If Ares = 8 cm, then the amplitude, A, of each of the original sinusoidal waves producing this resultant wave is:
Consider two identical waves travelling in the positive x-direction. The two waves start at the same position but at different times, t1 and t2. What should the time difference ∆t be in order to have a phase difference of π/4. Assume that the frequency of each wave is f = 20 Hz.
Two waves travelling in the same direction are given by: y1(x,t) = 0.2 sin(3πx-20t+π/2) and y2(x,t) = 0.2 sin(3πx-20t), where x and y are in meters and t is in seconds. The wave function of the resultant wave is:
Determine whether the flow is laminar or turbulent if glycerine at 25degC flows in a pipe with 150mm diameter. The average velocity of flow is 3.6m/s. (mass density = 1259 kg/m3; dynamic viscosity: 9.60 x 10^-1 Pa.s)
A flywheel of mass 15kg and a radius of 0.2m is mounted on a horizontal axle of radius 0.01m and negligible mass A force of 40N is applied tangentially to the axle.Find moment of inertia of the wheel,torgue, angular acceleration and angular velocity at the 10 s
A car has an acceleration of 1m/s².What is the change in its velocity after every 3 seconds?
A 2kg block is released 4m from a massless spring with force constant K=100N/m that is along a plane inclined at 30°.
a. if the plane is frictionless, find the maximum compression of the spring.
b. if the coefficient of kinetic friction between the plane and the block is 0.2, find the maximum compression.
c. for the plane in part(b), how far up the incline will the block travel after leaving the spring?
How many particles are present in a closed container if the energy it contains is 95577.88J, and the diatomic oxygen gas is moving at a velocity of 51.28m/s?
a particle in a central force field discribed by the spiral orbit r=r0e^(theta). how to show that the force law is inverse cube and that (theta) veries logrithmically with t?.
