A 1500-k ne engine 1 car accelerates from 0 to 27 m/s in 8.0 s. What is the aver

Question

A 1500-k ne engine 1 car accelerates from 0 to 27 m/s in 8.0 s. What is the average power 30 points) consider a block on a table. This block is pushed by a spring attached to the wall., s across the table, and then falls to the ground. The block has a mass spring constant is 560 Nrm, and the spring is initi slides a distance d-0.65 m across the table of height h 0.85 friction between the block and the table is ,-0.0 ie, no frictional force did consume the kinetic energy. What velocity (magnitude and the angle) will the block have when it lands on the floor if we don't count friction? (Velocity ally compressed by 0.110 m. The block 0 m. The coefficient of kinetic any work to including magnitude and the angle 8)?

Explanation / Answer

Energy stored in spring = 0.5*560*0.112=3.388 joule

Kinetic energy imparted to object = 3.388 Joule

horizontal velocity imparted to object = sqrt(3.388*2/1.55)=2.1 m/s

h=0.85 m

time required to fall 0.85m = sqrt(2*0.85/9.8)=0.416 second

vertical velocity of object just before hitting the ground = 0.416*9.8=4.08 m/s

horizontal velocity of object just before hitting the ground = 2.1 m/s

Magnitude velocity = sqrt(4.082+2.12)=4.59 m/s

Angle it makes with the horizontal = tan-1(4.08/2.1)=62.76o

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