作业帮求教一道英文物理题Consider a ball of mass 0.15kg thrown straight upwa
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求教一道英文物理题
Consider a ball of mass 0.15kg thrown straight upwards to a height of 10m (32.8 ft) from where you released it.
a.How much energy did you transfer to the ball?
b.What was the initial velocity as you released it?(hint:consider using conservation of energy instead of projectile motion equations)
c.Explain using words,equations and graphs the motion of the ball
Consider a ball of mass 0.15kg thrown straight upwards to a height of 10m (32.8 ft) from where you released it.
a.How much energy did you transfer to the ball?
b.What was the initial velocity as you released it?(hint:consider using conservation of energy instead of projectile motion equations)
c.Explain using words,equations and graphs the motion of the ball
1) Gravitational potential energy :GPE = mgh
0.15*10*9.81=14.715 J
2) Kinetic energy:KE = 1/2mv^2
Conservation of Energy:KEi + GPEi = GPEf + KEi
1/2*0.15*v^2 + 0 = 14.175 +0
0.15*v^2 = 28.35
v^2=189
v=13.75 m/s/s
3)以上
0.15*10*9.81=14.715 J
2) Kinetic energy:KE = 1/2mv^2
Conservation of Energy:KEi + GPEi = GPEf + KEi
1/2*0.15*v^2 + 0 = 14.175 +0
0.15*v^2 = 28.35
v^2=189
v=13.75 m/s/s
3)以上
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