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A farmland pushes a 20 kilogram bale of hay 3.3 meter across the floor of a barn. If she exerts a horizontal force of 73.0 Newton on the hay, determine how much work has she done?
A 150 g baseball is pitched at 50 m/s and is hit straight back at the pitcher at a speed of 60 m/s. What is the magnitude of the average force on the ball
a 30kg child wants to use a 20kg board that is 6.0m long as a seesaw. since all her friends are busy, How far from her will the support be
Light with a frequency of 2.77 x 1015 Hz strikes a metal surface and ejects electrons that have a maximum kinetic energy of 7.0 eV. What is the work function (in eV) of the metal?
two very large metal parallel plates that are 25cm apart oriented perpendicular to a sheet of paper are connected
a 0.40 kg mass attached to the end of a string swings in a vertical circle of radius 1.8 m. at an instant when the
A potential difference of 2.0 V is applied across a wire of cross sectional area 2.5 mm^2. What is the resistance of the wire
A 145 gram baseball is dropped from a tree 14.0 meter above the ground. If it hits the ground with a speed of 8.00 m/s, obtain the average force of air resistance exerted on it
Two 4.0 X 4.0 square aluminum electrodes, spaced 0.80 apart are connected to a 100battery. What is the charge on the positive electrode
A Thermopane window of area 6.8 m2 is constructed of two layers of glass, each 5.4mm thick and separated by an air space of 2 mm. If the inside is at 12?C and the outside is at ?36?C, how much heat is lost through the window? The thermal conductivity..
A string on a violin is stretched between two points 20.0 cm apart with a tension of 120 N. The total length of the string is 31 cm and it has a mass of 0.62 grams. The frequency of the third harmonic is?
A ballplayer standing at homeplate hits a baseball that is caught by another player at the same height above the ground from which it was hit. How high will the ball rise
The aurora is caused when electrons and protons, moving in the earth's magnetic field of ?5×10?5 T, collide with molecules of the atmosphere, find Radius of the electron and proton in m
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