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3 years ago

9

Maria rides a bicycle at a velocity of 8 m sl. She brakes suddenly and stops after a distance of 2 m. What is the acceleration o

f Maria and her bicycle?

1 answer:

Svetach [21]3 years ago

8 0

But I can help you if you need to answer this question

Dony

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A car moved 50 km to the North. What is its displacement?

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4 years ago

A 2 200-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 4.20 m before coming into contact

Kisachek [45]

Answer:

669042 N upward

Explanation:

$W_g$ = Work done by gravity on pile driver

$W_b$ = Work done by beam

u = Initial velocity

v = Final velocity

m = Mass of pile driver = 2200 kg

g = Acceleration due to gravity = 9.81 m/s²

h = Height the pile driver falls = 4.2 m

d = Bend in beam = 14 cm

Total work done = Change in Kinetic energy

$W_g+W_b=\frac{1}{2}m(v^2-u^2)\\\Rightarrow mg(h+d)+Fd=0\\\Rightarrow F=-\frac{mg(h+d)}{d}\\\Rightarrow F=-\frac{2200\times 9.81(4.2+0.14)}{0.14}\\\Rightarrow F=-669042\ N$

The force the beam exerts on the pile driver while the pile driver is brought to rest is 669042 N upward

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3 years ago