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An electron enters a region that contains a magnetic field directed into the page as shown. The velocity vector of the electron makes an angle of 30° with the +y axis. What is the direction of the magnetic force on the electron when it enters the field?
A) up, out of the page B) at an angle of 30° below the positive x axis C) at an angle of 30° above the positive x axis D) at an angle of 60° below the positive x axis E) at an angle of 60° above the positive x axis
Air at 13 psia and 20°F enters an adiabatic diffuser steadily with a velocity of 600 ft/s and leaves with a low velocity at a pressure of 14.5 psia. The exit area of the diffuser is 5 times the inlet area. Determine
A football punter accelerates a football from rest to a speed of 13 m/s during the time in which his toe is in contact with the ball (about 0.20 s). what average force does the punter exert on the ball
A 1.0 kg block of ice is resting at the top of a spherical ball of ice that has a radius of 1.0 meters. At what angle does the block of ice leave the surface of the sphere
Find the distance travelled by the first block in the first two seconds.
A football is kicked straight up into the air; it hits the ground 3.4 later. With what speed did it leave the kicker's foot
A hunter on a frozen, essentially frictionless pond uses a rifle that shoots 4.20g bullets at 975m/s. Find the recoil speed of the hunter if he fires the rifle horizontally
The lowest note on a violin string makes a 196 Hz (G below middle C) note. If this is the fundamental frequency for the string, how long is the string? What estimate do you need to make?
A bullet with mass 4.88 g is fired horizontally into a 2.106-kg block attached to a horizontal spring. Find the initial speed of the bullet-block system
A 38.8-cm diameter disk rotates with a constant angular acceleration of 2.60 rad/s2. It starts from rest at t = 0, and the line drawn from the center of the disk to the point P on the rim of the disk makes an angle of 57.3° with the positive x-axis a..
Water is circulating through a closed system of pipes in atwo-floor apartment. On the first floor, the water has a gaugepressure of 3.4*105 Pa and a speed of 2.1 m/s. However, on the second floor, which is 4.0m higher, the speed ofthe water is 3.7 ..
A bowling ball weighing 71.2 is attached to the ceiling by a 3.50 rope. The ball is pulled to one side and released; it then swings back and forth like a pendulum. As the rope swings through its lowest point, speed of the bowling ball is measured a..
two sources of sound are located on the x axis and each emits power uniformly in all directions. there are no
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