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A block of mass 50kg is pushed 20m along a frictionlesssurface by a constant horizontal force of 60N
What is the net work done on the block?
The work done on the block by the support force?
The change in kinetic energy of the block?
In gaseous sodium chloride, chloride ions have one more electron than they have protons, What is the magnitude of the electrostatic force the molecule exerts on it
The hammer throw is a track-and-field event in which a 7.30-kg ball (the hammer) is whirled around in a circle several times and released. It then moves upward on the familiar curved path of projectile motion and eventually returns to the ground s..
The force of the wind on the sails of a sailboat is 410 N north. The water exerts a force of 240 N east. If the boat (including crew) has a mass of 330 kg, illustrate what are the magnitude and direction of its acceleration?
Sodium ions (Na+) move at 0.855 m/s through a bloodstream in the arm of a person standing near a large magnet. what would be the magnetic force on the arm
By means of a rope whose mass is negligible, two blocks aresuspended over a pulley.One block wighs 11.0-kg and the other blockweighs 44.0-kg. find the mass of the pulley
a 55 kg swimmer is standing on a stationary 175 kg floating raft. the swimmer then runs off the raft horizontally with a velocity of + 3.7 m/s realtive to the shore. Find the recoil velocity that the raft would have
A Styrofoam box has a surface area of 0.74 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 27°C. If it takes 8.5 h for 5.0 kg of ice to melt in the container, determine the thermal cond..
The sound intensity of a whisper is 1.0x10^-10 W/m^2 at one meter distance from the source. At what distance does the intensity level drop by an additional 1dB
An Argon laser emits light with a wavelength = 486nm. Calculate the frequency for the emitted light. Calculate the energy of photon in the beam
It is desired to magnify reading materal by a factor of 2.5xwhen a book is placed 8.0 cm behind a lens. What is the power of the lens in diopters
Two electrodes are placed in a calcium chloride solution and a potential difference is maintained between them. what is the current in the solution
A 68.0 kg person escapes from a burning building by jumping from a window 25m above a catching net. Assuming that air resistance exerts a 95N force on the person during the fall, determine the person's velocity just before hitting the net.
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