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1) A cord is used to vertically lower an initially stationary block of mass M = 8.0 kg at a constant downward acceleration of g/2. When the block has fallen a distance d = 4.6 m, find (a) the work done by the cord's force on the block, (b) the work done by the gravitational force on the block, (c) the kinetic energy of the block, and (d) the speed of the block. (Note : Take the downward direction positive) 2) The only force acting on a 3.7 kg body as it moves along the positive x axis has an x component Fx = -3x N, where x is in meters. The velocity of the body at x = 2.6 m is 8.9 m/s. (a) What is the velocity of the body at x = 3.8 m? (b) At what positive value of x will the body have a velocity of 3.4 m/s? 3) A single force acts on a 2.6 kg particle-like object in such a way that the position of the object as a function of time is given by x = 4.3t - 2.3t2 + 3.4t3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to t = 9.0 s.
A standing wave pattern is created on a string with mass density = 0.00035 kg/m . A wave generator with frequency f = 62 Hz is attached to one end of the string and the other end goes over a pulley and is connected to a mass (ignore the weight of ..
A 3.0-kg block is traveling in the -x direction at 5.0 m/s, and a1.0-kg block is traveling in the +x diection at 3.0 m/s. (a)find the velocity Vcm of the center of mass.
The refractive index n of glass depends on the color (wavelength) of the light passing through it. The most common optical glass, Borosilicate BK7, What will be the distance between the lens and the image
helium atoms emit light at several wavelengths. light from a helium lamp illuminates a diffraction grating and is
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of itsengines is 3.90 x 105 N. In being launched from rest itmoves through a distance of 72.8 m and has a kinetic energy of ..
An airplane moves 140 m/s as it travels around the vertical circular loop which has a 1 km radius. What is the magnitude of the resultant force on the 70 kg pilot of this plane at the bottom of this loop.
What is the x-component of the electric field at the point. What is the y-component of the electric field at the point. What is the total magnitude of the electric field at the point.
A uniform narrow tube 1.79 long is open at both ends. It resonates at two successive harmonics of frequencies 285 and 342. What is the speed of sound in the gas in the tube
A 0.075 kg arrow is fired horizontally. The bowstring exerts an average force of 65 N on the arrow over a distance of 0.9 m. With what speed does the arrow leave the bow
You are called as an expert witness in the trial of a traffic violation. The facts are these: A driver slammed on his brakes and came to a stop with fix acceleration. Find how fast was he going when he hit his brakes
An image of the moon is focused onto a screen using a converging lens of focal length f= 36.3 cm. The diameter of the moon is 3.48×106 m, What is the diameter of the moon's image
Two joggers run at a constant velocity of 7.5 m/s toward the east. At time t=0, one is 15m east of the origin and te other is 15m west.
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