Question
even problems only
defined as the amount of energy of time or the rate of doing work. pressed as: P = W/t lb_f and the time in seconds, the in horsepower, expressed as: 1 hp = 550 ft lb_f/s. and the time in seconds, the in Watts, expressed as: 1 W = 1 J/s. from the previous chapters that: is work and F vector = m a vector is force. Between power, work, and force of the mechanical systems we work in the plant to be analyzed. This allows us to express power as: P = (m) (a vector) (d)/(t) Choose the word or phase that correctly completes each of the following sentences. a. One hp equals (3.3 times 10^4 ft lb_f, 550 lb_f, 33,000 ft lb_f/min, 550 lb_f/s. b. One Watt equals (1 J, 500 J, 60 J/m, 6 J/s). What makes a 250 hp gasoline engine more powerful than a 50 hp gasoline engine? How much work can a 50 hp outboard motor do in 30 min? How does power differ from work? A 5-ton weight must be lifted 100 ft in 2 min. What is the minimum horsepower rating of a motor that will meet this specification? Given the diagram below, a. Which path will require more power if the block is moved from A to B in the same amount of time? Explain your answer. b. Which path will require more power if the block is moved from A to B over Path ACB in twice the time required to move it over Path AB? Explain your answer.
Explanation / Answer
Question 2
250 hp will be more powerful as the power assosiated with it is 250 hp which is more than 50 hp so it given time interval,it will provide more energy(5 times) than 50 hp engine
Question4
Work =power*time
Rate of doing work is called power
Question 6
Since in AB,distance travelled is less so it will require less Work so less power as time is constant
ACB will require more power
(ii) if times is douled
but double of AB=10 which is more than ACB(7 ) so AB will require more power.
