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Two people carry a heavy electric motor by placing it on a light board 2.60 m long. One person lifts at one end with a force of 450 N , and the other lifts the opposite end with a force of 690 N . What is the weight of the motor? Where along the board is its center of gravity located?
A 120 granite cube slides down a 45 frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 210 steel cube at rest.
The index of refraction for crown glass is 1.512 at a wavelength of 660 nm (red), whereas its index of refraction is 1.530 at a wavelength of 410 nm (violet). what is the angle of refraction for each wavelength
one of your classmate has a friend with a boat. here is your classmate on water-skis being towed. what is the friction force of the water
Find the focal length of contact lenses that would allow a nearsighted person with a 145 cm far point to focus on the stars at night
A camera lens is initially set at f/16 for a shutter speed of 1/160s. what is the proper shutter speed at this setting
one capacitor with two flat conductors are seperated with 4mm. the area of each plate is 5m^2. one plate has charge of +200mC , calculate the capacitance of the device
A particle of mass 0.500 kg is attached to the 100-cm mark of a meter stick of mass 0.150 kg. Calculate the angular momentum of the system when the stick is pivoted about an axis perpendicular to the table through the 50.0-cm mark
Consider a dielectric material with dielectric constant (e) and with a given free charge distribution per unit volume ?f. Show that the dielectric constant is > 1 and show that the bound charge per unit volume ?b and the total charge per unit volume ..
a car with a speed of 40 kmh approaches the bottom of an icy hill. the hill has an angle of inclination of 10.5
In an experiment designed to measure the speed of light, a laser is aimed at a mirror that is 53.0 km due north. By how many meters (due east) will the reflected ray miss the detector
Initially, the translational rms speed of a molecule of an ideal gas is 464 m/s. find the final translational rms speed of the molecules
A 0.140-kg baseball is dropped from rest. It has a speed of 1.20 m/s just before it hits the ground. what is the average force exerted by the ground on the ball
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