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Assume that the total heat of vapourization (540 cal/g) of water is just sufficient to supply the energy needed to tear 1 g of water molecules apart from each other. A) How many molecules are there in 1 g of water? B) How much energy is needed per molecule for this purpose?
A 3.7 kg bucket of water is raised from a well by a rope. find the force exerted by the rope on the bucket of water
By what percent must one increase the tension in a guitar string to change speed of waves on the string from 327 m/s to 376 m/s.
Two charged particles, Q1 = +4.50 nC and Q2 = -2.70 nC, are separated by 30.0 cm. What is the electrical potential energy of the pair
A 23 bullet traveling 240 penetrates a 4 block of wood and emerges going 170. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges.
a 3.00-m long rod is hinged at one end. THe rod is initially held in the hozizontal position, what is the angular acceleration as it is released
a current of 0.750 A passes through a solenoid wound with 150 turns per centimeter. What is the diameter of the circular path
James bond (mass 78 kg) is running to catch a bag (mass 23 kg) containing an antiserum to a deadly disease. Initially Mr. Bond is running 4.4 m/s north and the bag is travelling 2.9 m/s east. What is the final velocity (magnitude and direction) of Ja..
A second force F2 is added to F1 . The resultant of the two vectors has a magnitude of 370 newtons and points along the (a) east/ (b) west line. Find the magnitude and direction of F2.
A man driving a car toward a large vertical wall sounds his horn. The car is traveling at 81 km/h. What is the frequency of the cars horn
A 2.8 m long pendulum is released from rest when the support string is at an angle of 28° with the vertical. What is the speed of the bob at the bottom of the swing
Calculate the force of gravity on a spacecraft 32000 km (5 earth radii) above the Earth's surface if its mass is 1800 kg. N (toward the earth)
q1. an electron librated from a hot filament cathode is attracted by an anode with a potential of 1200v positive with
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