physics
A man drags a sack of flour of mass 50 kg at constant speed up an inclined plan to a height of 5m. The plane makes an angle of 30„awith the horizontal and a constant frictional force of 200 N acts on the sack down the plane. 1- How much work does the man do A- against fri...
physics
Robin exerts a force of 100 N in pulling back his bow by 0.5 m. He fires the arrow (mass=0.2 kg) vertically upwards. a-How much energy is stored in his bow. b-How high does the arrow go?
physics
Galileo drops a stone from the leaning tower of Pisa, which is 45 meters high. At what speed does the stone hit the ground?
physics
A student finds that a stretched rubber band stores 3.5 J of energy. She uses it to propel an object of mass 0.025 kg vertically upwards. What will be the initial speed of the object? How high can it travel before coming momentarily to rest?
physics
A crane lifts 1 tonne of concrete through a height of 25 m. How much work does it do? (1 kg has a weight of 9.81 N.)
physics
The spectrum of light from the galaxy M100 has a prominent dark line at a wavelength of 592.2 nm. The same spectral line observed in a lab on earth has a wavelength of 589.4 nm. How fast is M100 moving relative to earth? (the speed of light = 3.00 x 108ms-1)
physics
A force of 100N pulls a box of weight 200N along a smooth horizontal surface makes 45(degree) to the floor . Calculate the work done by the force. A- in moving the box a distance of 25m along the horizontal. B- against gravity. C- against normal force.
chemistry
what is the difference between the real gases and the ideal gases ???
math
what will investment of 10 000 Yen amount to after 5 years if it earns 8% p.a. compund semi-annually ?
math
find the general term (un), of the geometric sequence which has : u7=24 and u15= 384 thank u
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