Figure 23-50 show’s a very large nonconducting sheet that has a uniform surface charge density of σ = −2.00 µ C/m 2 ; it also show a particle of charge Q = 6.00 µ c, at distance d from the sheet. Both are fixed in place. If d = 0.200 m, at what (a) positive and (b) negative coordinate on the x axis (other than infinity) is the net electric field E → net of the sheet and particle zero? (c) If d = 0.800 m. at what coordinate on the x axis is E → net = 0? Figure 23-50 Problem 40.
Figure 23-50 show’s a very large nonconducting sheet that has a uniform surface charge density of σ = −2.00 µ C/m 2 ; it also show a particle of charge Q = 6.00 µ c, at distance d from the sheet. Both are fixed in place. If d = 0.200 m, at what (a) positive and (b) negative coordinate on the x axis (other than infinity) is the net electric field E → net of the sheet and particle zero? (c) If d = 0.800 m. at what coordinate on the x axis is E → net = 0? Figure 23-50 Problem 40.
Figure 23-50 show’s a very large nonconducting sheet that has a uniform surface charge density of σ = −2.00µC/m2; it also show a particle of charge Q = 6.00 µ
c,
at distance d from the sheet. Both are fixed in place. If d = 0.200 m, at what (a) positive and (b) negative coordinate on the x axis (other than infinity) is the net electric field
E
→
net
of the sheet and particle zero? (c) If d = 0.800 m. at what coordinate on the x axis is
E
→
net
= 0?
A skateboarder with his board can be modeled as a particle of mass 80.0 kg, located at his center of mass. As shown in the figure below, the skateboarder starts from rest in a crouching position at one lip of a half-pipe (point). On his descent, the skateboarder moves without friction so
that his center of mass moves through one quarter of a circle of radius 6.20 m.
i
(a) Find his speed at the bottom of the half-pipe (point Ⓡ).
m/s
(b) Immediately after passing point Ⓑ, he stands up and raises his arms, lifting his center of mass and essentially "pumping" energy into the system. Next, the skateboarder glides upward with his center of mass moving in a quarter circle of radius 5.71 m, reaching point D. As he
passes through point ①, the speed of the skateboarder is 5.37 m/s. How much chemical potential energy in the body of the skateboarder was converted to mechanical energy when he stood up at point Ⓑ?
]
(c) How high above point ① does he rise?
m
A 31.0-kg child on a 3.00-m-long swing is released from rest when the ropes of the swing make an angle of 29.0° with the vertical.
(a) Neglecting friction, find the child's speed at the lowest position.
m/s
(b) If the actual speed of the child at the lowest position is 2.40 m/s, what is the mechanical energy lost due to friction?
]
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