Figure 8 - 73 a shows a molecule consisting of two atoms of masses m and M (with m ⪡ M ) and separation r . Figure 8 - 13 b shows the potential energy U ( r ) of the molecule as a function of r . Describe the motion of the atoms (a) if the total mechanical energy E of the two-atom system is greater than zero (as is E 1 ), and (b) if E is less than zero (as is E 2 ). For E 1 = 1 × 10 -19 J and r = 0.3 nm, find (c) the potential energy of the system, (d) the total kinetic energy of the atoms, and (e) the force (magnitude and direction) acting on each atom. For what values of r is the force (f) repulsive, (g) attractive, and (h) zero? Figure 8-73 Problem 134.
Figure 8 - 73 a shows a molecule consisting of two atoms of masses m and M (with m ⪡ M ) and separation r . Figure 8 - 13 b shows the potential energy U ( r ) of the molecule as a function of r . Describe the motion of the atoms (a) if the total mechanical energy E of the two-atom system is greater than zero (as is E 1 ), and (b) if E is less than zero (as is E 2 ). For E 1 = 1 × 10 -19 J and r = 0.3 nm, find (c) the potential energy of the system, (d) the total kinetic energy of the atoms, and (e) the force (magnitude and direction) acting on each atom. For what values of r is the force (f) repulsive, (g) attractive, and (h) zero? Figure 8-73 Problem 134.
Figure 8-73a shows a molecule consisting of two atoms of massesm and M (with m ⪡ M) and separation r. Figure 8-13b shows the potential energy U(r) of the molecule as a function of r. Describe the motion of the atoms (a) if the total mechanical energy E of the two-atom system is greater than zero (as is E1), and (b) if E is less than zero (as is E2). For E1 = 1 × 10-19 J and r = 0.3 nm, find (c) the potential energy of the system, (d) the total kinetic energy of the atoms, and (e) the force (magnitude and direction) acting on each atom. For what values of r is the force (f) repulsive, (g) attractive, and (h) zero?
a 2.00 g ice flake is released from the edge of a hemispherical bowl whose radius r is 22.0 cm. The flake–bowl contact is frictionless. (a) How much work is done on the flake by the gravitational force during the flake’s descent to the bottom of the bowl? (b)What is the change in the potential energy of the flake–Earth system during that descent? (c) If that potential energy is taken to be zero at the bottom of the bowl, what is its value when the flake is released? (d) If, instead, the potential energy is taken to be zero at the release point, what is its value when the flake reaches the bottom of the bowl? (e) If the mass of the flake were doubled, would the magnitudes of the answers to (a) through (d) increase, decrease, or remain the same?
A 40.5 kg box initially at rest is pushed 4.45 m along a rough, horizontal floor with a constant applied horizontal force of 135 N. If the coefficient of friction between box and floor is 0.300, find the following.
(a) the work done by the applied forceJ(b) the increase in internal energy in the box-floor system due to frictionJ(c) the work done by the normal forceJ(d) the work done by the gravitational forceJ(e) the change in kinetic energy of the boxJ(f) the final speed of the boxm/s
A 39.0 kg box initially at rest is pushed 5.15 m along a rough, horizontal floor with a constant applied horizontal force of 140 N. If the coefficient of friction between box and floor is 0.300, find the following.
(a) the work done by the applied force
The correct answer is not zero. J
(b) the increase in internal energy in the box-floor system due to friction
The correct answer is not zero. J
(c) the work done by the normal force
(d) the work done by the gravitational force
(e) the change in kinetic energy of the box
The correct answer is not zero. J
(f) the final speed of the box
The correct answer is not zero. m/s
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