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A sled and rider with with a combined mass of 50kg are at the top of a hil a height of 14m above the level ground below. The sled is given a push providing an initial kinetic energy at the top of the hill of 1700J.
a) After the push, what is the total mechanical energy of the sled and rider at the top of the hill?
b) If friction can be ignored, what will be the kinetic energy of the sled and rider at the bottom of the hill?
During spin-dry cycle of a washing machine, the motor slows from 90 rad/s to 30 rad/s while the turning the drum through an angle of 180 radians. What is the magnitude of the angular acceleration of the motor.
You have been called to testify as an expert witness in a trial involving an automobile accident, determine that the coefficient of kinetic friction between the wheels and the pavement at the time of the accident was 0.59
The mass of mars is 6.419 times 10 26 square kg and the mass of a single proton is 1.673 times 10 negative 27 square kg. assuming mars is made entirely of protons, how various protons would make up mars.
A butterfly at eye level is 26 cm in front of a plane mirror. You are behind the butterfly, 48 cm from the mirror. What is the distance between your eye and the image of butterfly in the mirror.
A fully equipped astronaut has a mass of 140 kg. If the astronaut has a weight of 675 N standing on the surface of a planet, what is the acceleration due to gravity on this planet?
A space station, in the form of a wheel 184 m in diameter, rotates to provide an "artificial gravity" of 7.40 m/s2 for persons who walk around on the outer rim. Find the rotational frequency of wheel (in revolutions per minute) that will produce t..
Two tiny conducting spheres are identical and carry charges of -21.4C and +51.0C. They are separated by a distance of 3.30 cm. (a) What is the magnitude of the force that each sphere experiences?
what is the volume of an iron atom. What is the ratio of the mass density of girder A to the mass density of girder B.
A speed skater goes around a turn that has a radius of 36 m. The skater has a speed of 12 m/s and experiences a centripetal force of 461 N
Two particles are fixed to an x axis: particle 1 of charge q1 = 1.86 x 10-8 C at x = 27cm and particle 2 of charge q2 = -3.63q1 at x = 77.7cm. At what coordinate on the x axis is the electric field produced by particles equal to zero.
A small body of mass 0.13 kg is undergoing simple harmonic motion of amplitude 9.0 cm and period 0.10 s. What is the maximum value of the force acting on it? If the oscillations are produced by a spring, what is the spring constant?
what is the minimum acceleration necessary for the plane to take flight.
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