In the system shown in Figure P5.23, a horizontal force F → acts on an object of mass m 2 = 8.00 kg. The horizontal surface is frictionless. Consider the acceleration of the sliding object as a function of F r . (a) For what values of F r does the object of mass m 1 = 2.00 kg accelerate upward? (b) For what values of F r is the tension in the cord zero? (c) Plot the acceleration of the m 2 object versus F 1 . Include values of F r from −100 N to +100 N. Figure P5.23
In the system shown in Figure P5.23, a horizontal force F → acts on an object of mass m 2 = 8.00 kg. The horizontal surface is frictionless. Consider the acceleration of the sliding object as a function of F r . (a) For what values of F r does the object of mass m 1 = 2.00 kg accelerate upward? (b) For what values of F r is the tension in the cord zero? (c) Plot the acceleration of the m 2 object versus F 1 . Include values of F r from −100 N to +100 N. Figure P5.23
Solution Summary: The author explains how the object of mass m_1=2.0kg accelerates upward with a horizontal force.
In the system shown in Figure P5.23, a horizontal force
F
→
acts on an object of mass m2 = 8.00 kg. The horizontal surface is frictionless. Consider the acceleration of the sliding object as a function of Fr. (a) For what values of Fr does the object of mass m1 = 2.00 kg accelerate upward? (b) For what values of Fr is the tension in the cord zero? (c) Plot the acceleration of the m2 object versus F1. Include values of Fr from −100 N to +100 N.
L₁
D₁
L₂
D2
Aluminum has a resistivity of p = 2.65 × 10 8 2. m. An aluminum wire is L = 2.00 m long and has a
circular cross section that is not constant. The diameter of the wire is D₁ = 0.17 mm for a length of
L₁ = 0.500 m and a diameter of D2 = 0.24 mm for the rest of the length.
a) What is the resistance of this wire?
R =
Hint
A potential difference of AV = 1.40 V is applied across the wire.
b) What is the magnitude of the current density in the thin part of the wire?
Hint
J1
=
c) What is the magnitude of the current density in the thick part of the wire?
J₂ =
d) What is the magnitude of the electric field in the thin part of the wire?
E1
=
Hint
e) What is the magnitude of the electric field in the thick part of the wire?
E2
=
please help
A cheetah spots a gazelle in the distance and begins to sprint from rest, accelerating uniformly at a rate of 8.00 m/s^2 for 5 seconds. After 5 seconds, the cheetah sees that the gazelle has escaped to safety, so it begins to decelerate uniformly at 6.00 m/s^2 until it comes to a stop.
Chapter 5 Solutions
Physics for Scientists and Engineers with Modern Physics, Technology Update
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