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A force f is expressed with respect to the basis e1 and e2 by equation 2(3e1+4e2) N. If the directions of e1 makes an angle of 30 degree with f, find the vector e2.
A bob on the end of a spring is pulled and released.If the bob moves up and down 12 times in 3.6 seconds, determine the period and frequency of the oscillation.
Calculate the efficiency of the following devices
A lamp which converts 17 W out of every 20 W into thermal energy. The lamp is being used for the sole purpose of lighting the room.
A ship keel plate is 5.25m x 1.85m. Determine the maximum force on the plate when the ship is in fresh water at draught (height) of 6.14m.
A beam LO weighing 50N rests against a wall, the lower part of the beam extending 15 m from the base of the wall. Calculate the minimum value of the force F that can be applied to keep the beam in equilibrium. The coefficient of friction at L and O is 0.30.
A force f is expressed with respect to the basis e1 and e2 by equation 2(3e1+4e2) N. If the directions of e1 makes an angle of 30 degree with f, find the vector e2.
When two objects with masses of 200 kg and 500 kg were tested for gravitational attraction. Their centers were separated by a distance of 25 m. Find the force of gravitation between them. (ex: 6.57x10^10 N)
Chou trains his lethal moves in the planes of the small slumdog town of Antoinerei. As he practices, the gravitational potential energy associated with his jump was 1970 J. If Chou's mass was 82 kg. How high did he jump?
A roller coaster of mass 800 kg starts from rest at the top of a hill with 1,500,000 J of potential energy. It ends up at ground level moving at 45 m/s. How much energy was lost to heat and friction?
A rock ejected from a volcano with a speed of 25m/s and at an angle of 35 degrees above the horizontal. If the rock hits the side of the volcano at an altitude 20m lower than the starting point, how long does it take the rock to reach the starting point?
