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vector A of magnitude 20 units lies in the direction 45 degrees S of E, while vector B, of magnitude 30 units is in the direction 60 degrees W of N. Calculate the scaler product A.B
A student can’t really use a yo-yo very well, so he swings it around his head in a horizontal circle. He notices that the faster he swings it, the more tension there is in the string. He wonders if there is a relationship between the tension in the string and the period of the swings. He hypothesizes that tension increases with decreasing period. Using your knowledge of physics, make a statement that supports his hypothesis. Explain, but do not use an equation.
A 15 kg box is pulled at an angle of 15* from the horizontal with a force of 55N In the coefficient of kinetic friction is 0.25. What is the normal force?
a) The satellite is just above the surface of the earth.
b) The satellite is at an altitude of 300 km above the earth.
(Assume that air resistance can be neglected)
Provide your answers in minutes.
