A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor?
a. 9.6 N s
b. 2.4 N s
c. 6.4 N s
d. 1.6 N s
e. 1.0 N s
[Ques. 2] When photon absorption occurs in a hydrogen
atom, the principal quantum number of the
electron must
a) decrease.
b) remain the same.
c) increase.
d) become identical to that of a ground state electron.
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[Ques. 3] A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30 below the horizontal just before it strikes a horizontal surface. The ball leaves this surface 0.50 s later with a velocity of 2.0 m/s directed 60 above the horizontal. What is the magnitude of the average resultant force on the ball?
a. 14 N
b. 11 N
c. 18 N
d. 22 N
e. 3.0 N
[Ques. 4] When the principal quantum number of the
hydrogen electron is infinite,
a) the electron has an orbit of 0.053 nm radius.
b) the electron has a binding energy of +13.60 eV.
c) the electron has a binding energy of -13.60 eV.
d) the electron is no longer bound to the hydrogen
nucleus at all.
[Ques. 5] The orbits of the electrons in the hydrogen atom
are
a)evenly spaced.
b)characterized by a principal quantum number.
c)always smaller than that of the ground state.
d)all at the same energy level within a given atom.
[Ques. 6] A 1.2-kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction. If the object is in contact with the wall for 2.0 ms, what is the magnitude of the average force on the object by the wall?
a. 9.8 kN
b. 8.4 kN
c. 7.7 kN
d. 9.1 kN
e. 1.2 kN
[Ques. 7] The quantum hypothesis was originated by?
a)Einstein
b)Bohr
c)Planck
d)Rutherford
[Ques. 8] A 2000-kg truck traveling at a speed of 6.0 m/s makes a 90 turn in a time of 4.0 s and emerges from this turn with a speed of 4.0 m/s. What is the magnitude of the average resultant force on the truck during this turn?
a. 4.0 kN
b. 5.0 kN
c. 3.6 kN
d. 6.4 kN
e. 0.67 kN
[Ques. 9] In a parallel electric circuit, the voltage
a) is different across each branch of the circuit.
b) is the same across all circuit components.
c) must vary with time and is called ac.
d) must never become negative.
[Ques. 10] A uniform solid sphere rolls without slipping along a horizontal surface. What fraction of its total kinetic energy is in the form of rotational kinetic energy about the CM?
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