Golf Clubs Toddler
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can you help me in physics?
An object has a kinetic energy of 297 J and a momentum of magnitude 22.8 kg·m/s. Find the speed and the mass of the object.
speed ____m/s
mass ____ kg
A man claims he can safely hold on to a 10.3-kg child in a head-on collision with a relative speed of 139-mi/h lasting for 0.10 s as long as he has his seat belt on.
(a) Find the magnitude of the average force needed to hold onto the child.
_____________ N
(b) Based on the result to part (a), is the man’s claim valid?
________________________
(c) What does the answer to this problem say about laws requiring the use of proper safety devices such as seat belts and special toddler seats?
________________
High-speed stroboscopic photographs show that the head of a 210 g golf club is traveling at 58 m/s just before it strikes a 46 g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 46 m/s. Find the speed of the golf ball just after impact.
_______ m/s
Ek=p^2/2m
m=p^2/2Ek
=(22.8)^2/2(297)
=0.875kg
p=mv
v=p/m
=(22.8)/(0.875)
=26.05m/s
i can’t do the second parts, i dont know the conversion factor from mi to km or m, but once you get there the formula to use is:
F=ma
=m(delta v)/(delta t) <--- for delta v, v2 will be 0.
mva+mvb=mva'+mvb'
0.21(58)=(0.210)(46)+(0.046)vb
vb=((0.210)(58)-(0.210)(46))/0.046
=54.8m/s
cheers.
Toddler Banging Wall With Golf Club