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A suspicious-looking man runs as fast as he can along a moving sidewalk from one end to the other, taking 4.00 s. Then security agents appear and the man runs as fast as he can back along the sidewalk to his starting point, taking 12.5 s. What is the ratio of the man's running speed to the sidewalk's speed? (running speed / sidewalk speed)
A white billiard ball with mass mw = 1.3 kg is moving directly to the right with a speed of v = 3.42 m/s and collides elastically with a black billiard ball with the same mass mb = 1.3 kg, What is the final speed of the white ball
Water flows with speed 1 m/s from a small hole made at the bottom of a tank filled with water. Find height of the tank
While moving down the track at 10.0 m/s, you uniformly accelerate to 32.0 m/s in 10 s. Illustrate what is the average net force that you have applied to the car during the 10 s interval?
two conducting spheres, one of radius 6.0 cm, and the other of radius 120 cm, each have a charge of 20 nC, calculate the surface charge density of each sphere
Define potential difference. What is the difference between electric potential and electric potential energy? What is the unit for potential difference
What is the mass of the block on the left. At what rate is the plate's area increasing when the radius is 50 cm? (Give your answer correct to 2 decimal places.)
If n=10, what is the largest value of the angular momentum l in this shell, How many electrons can be placed in this shell
A 42.5 mA current is carried by a uniformly wound air-core solenoid with 425 turns, a 19.5 mm diameter, and 13.0 cm length. Compute the inductance of the solenoid
Assume that you have two objects, one with a mass of 5 kg and the other with a mass of 17 kg, each with a charge of ?0.011 C and separated by a distance of 8 m. What is the electric force that these objects exert on one another? Answer in units of..
On another planet the simple pendulum consisting of a 0.154 kg mass suspended on a 1.20 m long string has a period of 3.860 seconds. What is acceleration on this planet.
A person walks first at a constant speed of 4.80 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 3.30 m/s. What is her average speed over the entire trip?
A curve with a 140 radius on a level road is banked at the correct angle for a speed of 20 . If an automobile rounds this curve at 30 , what is the minimum coefficient of static friction between tires and road needed to prevent skidding.
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