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3 years ago

When I bump the table, the coffee in my cup spilled out. Newton's _____ law explains this reaction.

2 answers:

Ivan3 years ago

7 0

When I bump the table, the coffee in my cup spilled out. Newton's 1st law explains this reaction.

Answer: A) or the first option.

Tems11 [23]3 years ago

3 0

Answer:

Newton's 1st law explains this reaction

Explanation:

Newton's first law of motion, states that " a body at rest or uniform motion in a straight line, will continue in that state, unless acted upon by an external force.

The coffee in the cup, initially rest on the table, but the moment you bump the table, you act as an external force which distort the initial state of the coffee, making it to spill out.

Therefore, Newton's 1st law explains this reaction.

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3 years ago

A swimmer bounces almost straight up from a diving board and falls vertically feet first into a pool.she starts with a speed of

garik1379 [7]

Answer:

a) 1.20227 seconds

b) 0.98674 m

c) 7.3942875 m/s

Explanation:

t = Time taken

u = Initial velocity = 4.4 m/s

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.81 m/s²

$v=u+at\\\Rightarrow 0=4.4-9.81\times t\\\Rightarrow \frac{-4.4}{-9.81}=t\\\Rightarrow t=0.44852\ s$

$s=ut+\frac{1}{2}at^2\\\Rightarrow s=4.4\times 0.44852+\frac{1}{2}\times -9.81\times 0.44852^2\\\Rightarrow s=0.98674\ m$

b) Her highest height above the board is 0.98674 m

Total height she would fall is 0.98674+1.8 = 2.78674 m

$s=ut+\frac{1}{2}at^2\\\Rightarrow 2.78674=0t+\frac{1}{2}\times 9.81\times t^2\\\Rightarrow t=\sqrt{\frac{2.78674\times 2}{9.81}}\\\Rightarrow t=0.75375\ s$

a) Her feet are in the air for 0.75375+0.44852 = 1.20227 seconds

$v=u+at\\\Rightarrow v=0+9.81\times 0.75375\\\Rightarrow v=7.3942875\ m/s$

c) Her velocity when her feet hit the water is 7.3942875 m/s

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3 years ago