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A skier of mass 79 kg is pulled up a slope by a motor-driven cable.
(a) How much work is required to pull him 55 m up a 30° slope (assumed frictionless) at a constant speed of 1.8 m/s?
? J
(b) What power must a motor have to perform this task?
? hp
A ship sets out to sail to a point 136 km due north. An unexpected storm blows the ship to a point 108 km due east of its starting point. How far must it now sail to reach its original destination.
A particle with a mass of 4.10 × 10-20 kg is oscillating with simple harmonic motion with a period of 2.9 × 10-5 s and a maximum speed of 2.3 × 103 m/s.
Calculate the radius of the path, direction of the force experienced by the electron and the path of the electron through the magnetic field.
An 80 N box initially at rest is pulled by a horizontal rope on a horizontal table. Find the friction force on the box if the pull is 25 N and the box remains at rest
Find out an angular momentum of the system
The density of water is about 1000 kg/m3 and the density of air is about 1 kg/m3.
at 22m from a sound source, the intensity level is 52dB. A: what is the level at distance of 60 B: what is the level at distance of 216m
A turtle crawls along a straight line, which we will call the x-axis with the positive direction to the right. The equation for the turtle's position as a function of time is x(t) = 50.0 cm +(2.00 cm/s)t -(.0625 cm/s^2)t^2 At what time is the turt..
A space vehicle is traveling at 3570 km/h relative to Earth when the exhausted rocket motor is disengaged, What is the speed (in km/h) of the command module relative to Earth just after the separation
Calculate the orbital period of Neptune (in yr) from knowledge of G, the mass of the sun (M = 1.99*10^30 kg), and the orbital radius of Neptune of 3.00*10^1A.U
Two sinusoidal waves of the same period, with amplitudes of 7.0 and 9.0 mm, What is the phase constant of the other wave
A lens of focal length 15.0 cm is used to create an image of the Full Moon. What is diameter of the image? The Moon's radius and average distance from Earth are 1.74× 106m and 3.85× 108 m, respectively
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