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Calculate the weight of a machine with mass m = 1.2 t when it passes with velocity v = 20 m / s through the lowest point of a bridge bent down. The radius of the bridge is R = 100 m. Compare this weight with the weight of the car at rest. What is the cause of the change in weight of the car compared to the usual weight?
Using the gravitational pull between the Earth and the Moon and knowing the distance Earth - Moon R = 384000 km, calculate the mass of the Earth. The range is known = 6.67 × 10-¹¹ Nm² / kg², the orbital period of the Moon is T = 27.3 days.
Sonar is a system similar to radar except that sound is used in place of radio waves. Sonar systems
are generally operated under water, where the speed of sound is approximately 1500 m/s. Suppose you are on a ship monitoring the distance to a submarine using sonar, and you find that
the sonar reflections return in 24 s. How far away is the submarine?
A wave on a string is described by the equation y(x,t) = 4.2 cos (3000 rad/s t + 5.0 rad/m x)
where t is measured in s and x is measured in mm.
(a) What is the amplitude of this wave?
(b) What are the frequency and wavelength of the wave?
(c) What is the velocity of the wave?
A wave on a string is described by the relation y =0.15 sin(200πt -0.045x), where t is
measured in seconds and x in meters.
(a) What is the time required for a single wavelength to pass a fixed point by the wave?
(b) What is the maximum speed of a point on the string?
A wave on a string is described by the relation y =0.15 sin(35t -0.025x), where t is measured
in seconds and x in meters. Find the amplitude, frequency, wavelength, and speed of this wave.
What is the energy of photon of wavelength 1 mm? Compare this with the characteristic thermal energy at 3000K.
if a car passes four station with a constant acceleration the station are named a,b,c,and d initially at rest if Vi=2Vb, Vd=3Vc and the distance traveled from B to c is 200m. find the total distance traveled?
consider me a balloon of mass 0.03kg being inflated with a gas of density 0.54kgm^-3. what will be the volume f the balloon when it just begins to rise in air of density 1.29kgm^-3
A ball attached at the end of a string revolving in a horizontal circle of radius,R,at whirle a constant speed,v.The tension in the string is F.What is the force needed to increase the speed by 50%?
