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If you hold a bar magnet in each hand and bring your hands close together, will the force be attractive or repulsive if the magnets are held so that
1. The two north poles are brought close together?
2. A north pole and a south pole are brought together?
A 120-g mug at 21C is filled with 210g of coffee at 91C. suppose all of the heat lost by the coffee is transferred to the mug, what is the final temperature of the coffee? The specific heat capacity of the mug is 7.8 X 10^2 J/(Kg C)
An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.27 × 10-6 T. What is the intensity S of the wave
q1. explain what causes the seasons that we experience in the temperate region of the northern hemisphere. do you have
For a diverging lens (f = â€"16.0 cm), find the image distance for an object that is 16.0 cm from the lens. Determine the magnification of the lens
A 610 kilogram elevator starts from rest and moves upward for 3.10 second with constant acceleration until it reaches its cruising speed, 1.66 m/s. Find the average power of the elevator motor during this period
Compute the heat absorbed by the gas and work done by the gas during expansion.
A 1200-kg station wagon is moving along a straight highway at 12.0 m/s. Another car, with mass 1800 kg, Find the total momentum of the system
A solar collector is placed in direct sunlight where it absorbs energy at the rate of 910 J/s for each square meter of its surface. The emissivity of the solar collector is e = 0.79. What equilibrium temperature does the collector reach? Assume that ..
In figure, a ball is thrown up onto a roof, landing some timelater at height h = 20.0 m above and d = 30.0 mhorizontally from the release point. The ball's path just beforelanding is angled at θ = 60.0o with the horizontal roof. (a)Find the time o..
A bacterium (mass = 2 × 10-15 kg) in the blood is moving at 0.28 m/s. What is the de Broglie wavelegth of this bacterium
a frictionless pendulum of length 3 m swings with an amplitude of10 degrees. What is the kinetic energy of the pendulum whenits potential energy is 5 J
A 66 kg woman cheats on her diet and eats a 643 Calorie (540 kcal) jelly donut for breakfast. How many joules of energy is the equivalent of one jelly doughnut?
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