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Imagine that you volunteered to spin on the stool for the classroom demo on the conservation of angular momentum. Initially you spin at 3.74 radians/s by your arms outstretched and a moment of inertia of 5.34 kg m2.While spinning, you abruptly draw your arms in, reducing your moment of inertia to 1.60 kg m2. What is your angular speed as a result? Give your answer in radian/s
1. A sodium atom (Z = 11) contains 11 protons in its nucleus. Strictly speaking, the Bohr model does not apply, as the neutral atom contains 11 electrons instead of a single electron. but, we can apply the model to the outermost electron as an approximation, provided that we utilize an effective value Zeffective rather than 11 for the number of protons in the nucleus. (a) The ionization energy for the outermost electron in a sodium atom is 5.1 eV. Utilize the Bohr model with Z =Zeffective to compute a value for Zeffective. (b) Using Z = 11, decide the corresponding value for the radius r of the outermost Bohr orbit.(c) Using the value computed for Zeffective in part (a),decide the corresponding radius r of the outermost Bohr orbit.
A baseball (m = 145 g) approaches a bat horizontally at a speed of 41.5 m/s (93 mi/h) and is hit straight back at a speed of 45.8 m/s (102 mi/h). what is the average force exerted on the ball by the bat
the proper length of one spaceship is three times that of another. the two spaceships are traveling in the same
during liftoff a hot-air balloon accelerates upward at a rate of 3.3 . the balloonist drops an object over the side of
when the three blocks are released from rest they accelerate with a magnitude of 0.600 ms2. block 1 has mass m block 2
determine a set of non-orthogonal base vectors a j k b i k and c i j.a establish their reciprocal vectors and
The polarizing direction of the first sheet is parallel to the x axis, that of the second sheet is at an angle of 30 degree counter-clockwise from the y axis, and that of the initial third sheet is at an angle of 60 degree
An elevator has a mass of1170 kg and carries a maximum load of 786 kg. A constant frictionalforce of 4260 N retards its motion upward. Theacceleration of gravity is 9.8 m/s2 .
q1. a 3.3 block of wood sits on a table. a 3.0 bullet fired horizontally at a speed of 480 goes completely through the
q1. a 35 g horizontal metal bar 11 cm long is free to slide up and down between two tall vertical metal rods. a
a block is pushed across a rough horizontal surface by a horizontal force of magnitude P= 25 . The coefficient of kinetic friction between the block and the ground is 0.3 if the blck started from rest
In a common but dangerous prank, a chair is pulled away as a personis moving downward to sit on it, causing the victim to land hard onthe floor. Suppose the victim falls by 0.50 m, the mass that moves downward is 70 kg, and the collision on the fl..
at a certain location the earth has a magnetic ?eld of 8.3 times 10-5 t pointing in the northward direction at 44?
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