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a mechanic pushes a 240 103 kg car from rest to a speed of v doing 4950 j of work in the process during this time the
a horizontal force of 150 n is used to push a 425 kg packing crate a distance of 690 m on a rough horizontal surface if
a sled weighing 610 n is pulled horizontally across snow so that the coefficient of kinetic friction between sled and
a 26-kg object hangs at one end of a rope that is attached to a support on a railroad car when the car accelerates to
a submerged scuba diver looks up toward the calm surface of a freshwater lake and notes that the sun appears to be 32
1 how does the diameter of the lens affect magnification2 how does the diameter of the lens affect the focal
a proton is moving along the axis of a uniformly charged thin ring of 20 nccm the radius of the ring is 5 cm if the
an air bubble rises from the bottom of well where the temperature is 25 degree c to the surface where the temperature
an energy-efficient lightbulb taking in 240 w of power can produce the same level of brightness as a conventional
at a particular instant charge 480times106 c is at the point 0 0250 m 0 and has velocity 920 x 105 ms i charge
a rectangular loop with dimensions 420 cm by 950 cm carries current i the current in the loop produces a magnetic
an explosive at ground level leaves a crater with a diameter that is proportional to the energy of the explosion raised
blue light of frequency 65 1014 hz falls on the surface of potassium which has a work function of 226 ev find the
to expose photographic film a minimum energy of 10 ev must be absorbed from a photon by a silver bromide molecule on
a he-ne laser produces light of wavelength 633 nm with intensity 102 103 wm2 over a beam of cross-sectional area 0940
a human skin is most sensitive to ultraviolet light of approximate wavelength 300 nm i know the energy of the light is
one type of slingshot can be made from a length of rope and a leather pocket for holding the stone the stone can be
can you have angular velocity if an object does not move linearly explaincan you have angular velocity if an object is
problem meter stick pendulumconsider pendulum formed from a meter stick pinned at the end the center of mass com is at
consider a transverse wave were represented by function y 23 sin19x-25t where yx and t are in units of mm and seconds
the system shown to the right is in equilibrium the steel block has a mass m1 and the uniform rigid aluminum strut has
the reflecting surfaces of two mirrors form a vertex with an angle of 125 degreesif a ray of light strikes mirror 1
a laser beam is reflected by a plane mirror it is observed that the angle between the incident and reflected beams is
a glass slab surrounded by air causes a sideways displacement in a beam of lightpart aif the slab is now placed in
an electric motor under steady load draws 97 amperes at 110 volts it delivers 093 kw of mechanical energy the