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Q. A proton moving at 4.0 x 104 m/s horizontally enters a region where a magnetic field of 0.13 T is present, directed vertically downward. What force acts on the proton?
Q. A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book weighs 31 N. The coefficient of static friction between his hands and the book is 0.34. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?
What is the electric flux through the circle when its face is perpendicular to the field lines?
Use approximate calculations assuming constant current during the output pulse. Calculate the ampere-hour rating of the battery so it lasts for five years.
What is the speed of each ball as it strikes the ground? How far apart are the balls 0.700 s after they are thrown.
A crate of mass 150.0 kg lies at rest on a horizontal storage room floor. The coefficient of static friction between crate and floor is 0.72, and the coefficient of kinetic friction is 0.85. (You may suppose g = 10.0m/s2).
An airplane is flying with a velocity of 81.0 m/s at an angle of 24.0^circ above the horizontal. When the plane is a distance 108m directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
A skier starts from rest at the top of a hill that is inclined at 12.0° with the horizontal. The hillside is 180.0 m long, and the coefficient of friction between the snow and the skis is 0.0750. At the bottom of the hill, the snow is level and the c..
Calculate the time constant that is equal to the time taken by a capacitor to fully charge or discharge.
Two boats start together and race across a 62-km-wide lake and back. Boat A goes across at 62 km/h and returns at 62 km/h. Boat B goes across at 31 km/h, and its crew, realizing how far behind it is getting, returns at 93 km/h.
A particle of mass M moves in one dimension along the positive x axis, under the influence of two forces. The first force is a constant force, with magnitude B and direction toward the origin. The second force is an inverse square law, with magnitude..
How much heat does it take to increase the temperature of 4.50 moles of a diatomic ideal gas through an amount 40 if the gas is held at constant volume? The gas molecules can translate and rotate but not vibrate.
What is total distance the bird travels by trains collide
Establish the average net force
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