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A boy pulls a box with a mass of 30 kg with a force of 25 N at 30 deg angle in the North East direction. Ignoringfriction, what is the acceleration of the box? What is the normalforce exerted on the box by the ground?
Two spherical asteroids have the same radius R. Asteroid 1 has mass M and asteroid 2 has mass 2M. What is the speed of each asteroid just before they collide
question a car of massmtraveling at speedvcrashes into the rear of a truck of mass 2mthat is at rest and in neutral at
A step-down transformer is used to drop an alternating voltage from 10,000 to 500 V. What must be the ratio of secondary turns to primary turns? If the input current is 1.00 A and the transformer is 100% efficient, what is the output current?
A monochromatic beam of light is absorbed by a collection of ground-state hydrogen atoms in such a way that three different wave-lengths are observed while the hydrogen relaxes back to the ground state. What is the wavelength of the incident beam.
A 70.0cm wire of mass 8.20g is tied at both ends and adjusted to a tension of 41.0N. When it is vibrating in its second overtone, find the frequency at which it is vibrating
Westerly winds coming off the Pacific Ocean rise over the Rocky Mountains, which rise to a height of approximately 15,000 ft (580 hPa). The air on the western side of the mountain range is at 800 hPa (T = 70F, r = 0.75), and will subside on the easte..
A container of cross-sectional area 102 cm2 contains liquid of density 1.95 g/cm3 to a height of 6.60 cm above a small hole of area 1.00 cm2 in the side. Find the speed of the fluid as it leaves the hole
A box with a mass of 5 kg is lifted (without acceleration) through a height of 2 m to place it upon the shelf of a closet. What is the increase in potential energy of the box
A solid sphere of moment of inertia (2/5) MR^2 rolls without slipping down an incline plane of 30 degrees from a height of 8 meters. What is the velocity at the bottom
A boat must cross a 260-m-wide river and arrive at a point 110 m upstream from where it starts, What is the speed of the boat in still water
A rectangular loop is located next to a long straight wire carrying a current of 30.0 A. What is the direction of the net force on the loop
A sphere of copper that has a radius of 5 cm is compressed uniformly by a force of 3.0 108 N. Calculate the change in volume of the sphere
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