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A bird stands on a dc electric transmission line carrying 2500 A (Fig. 18-34). The line has 2.7 10-5 resistance per meter and the bird's feet are 4.0 cm apart. What is the potential difference between the bird's feet?
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A car moves with a constant speed of 60 mph. What is the apparent weight of a 70 kg passenger when the car is at the bottom of a dip with a radius r = 100 m? m*g = N + (m*v*v/r) (70kg)(9.8) = N +(70kg)(26.82m/s)(26.82m/s ...
Question: A penny is placed at the outer edge of a disk (radius = 0.147 m) that rotates about an axis perpendicular to the plane of the disk at its center. The period of the rotation is 1.70 s. Find the minimum coefficie ...
Question: Ten days after it was launched toward Mars in December 1998, the Mars Climate Orbiter spacecraft (mass 629 kg) was 2.87x10^6 km from the earth and traveling at 1.20x10^4 km/hr relative to the earth. At this tim ...
Question: A picture window has dimensions of 1.40 m x 2.50m and is made of glass 6.00mm thick. On a winter day, the outside temperature is -15.0?C , while the inside temperature is a comfortable 21.0°C . Part A: At what ...
Question: Suppose the free-fall acceleration at some location on earth was exactly 9.8000 m/s^2. What would it be at the top of a 1000 -tall tower at this location? The response must be typed, single spaced, must be in t ...
Question: A real image is four times as far from a lens as is the object. What is the object distance, measured in focal lengths? The response must be typed, single spaced, must be in times new roman font (size 12) and m ...
Question: A point charge with charge q_1 is held stationary at the origin. A second point charge with charge q_2 moves from the point (x1, 0) to the point (x2, y2). How much work W is done by the electrostatic force on t ...
Question: The position of a mass oscillating on a spring is given byx = (6.8 cm) cos[2t/(0.91 s)]. (a) What is the frequency of this motion? (b) When is the mass first at the position x =-6.8cm? The response must be type ...
Question: An object in the shape of a thin ring has radius a and mass M. A uniform sphere with mass m and radius Ris placed with its center at a distance x to the right of the center of the ring, along a line through the ...
Question: A semicircle of radius a is in the first and second quadrants, with the center of curvature at the origin. Positive charge +Q is distributed uniformly around the left half of the semicircle, and negative charge ...
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