A special ladder used by firefighters is mounted on a hydraulic pump that permits the ladder to be rotated, tilted, and extended from a set of controls on the fire engine. When a 70.0 kg firefighter is at the end of the fully-extended ladder, and the ladder makes an angle of 10.0° with the vertical, a torque of 7080 N•m must be exerted by the machinery at the base of the ladder in order to keep the ladder from rotating. If the upward force exerted on the ladder at its base is 3140N what is the length of the ladder?

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Q: what was the average speed in meters per second of a race car that travels once every 8 seconds…

A: Radius of the circular track is r = 70 mt Time taken by the car is T = 8 s

Q: 2nrad / sec2 60 rad / sec2 O rad/sec2 n rad/ sec2

A: angular displacement in 1 min  is 2π now angular speed is (2π/15)/4 sec = 2π/60 rad/sec

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A:

Q: During a NASCAR race a car goes 50 m/s around a curved section of the track that had a radius of 250…

A: Given data *The given speed of the car is v = 50 m/s *The given radius of the track is r = 250 m

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Q: what was the average speed in meters per second of a race car that travels once every 8 seconds…

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A: acceleration (a) = 0.66 g diameter (d) = 30 m Radius (R) = 15 m

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Q: Define the term trajectory? What kind of information can be predicted from the trajectory?

A: To explain : TRAJECTORY

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A: What is speed and how is it determined?

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A: mass of bucket (m) of water = 5 kg Number of swings = 8 , time taken = 8 seconds Thus, time taken…

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.