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Sedbober [7]
3 years ago
13

Which one gives the feeling of heaviness in the case of a kilogram of cotton or a kilogram of lead? Why?​

Physics
1 answer:
brilliants [131]3 years ago
3 0

Strange as it may seem, they both give the same "feeling of heaviness".

If you put them in a pair of equal-size sealed boxes, there's no way for anyone to tell which box has the cotton and which box has the lead.

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A bicyclist starts at point P and travels around a triangular path that takes her through points Q and R before returning to the
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Displacement by cyclist is zero.

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A ball is kicked at an angle of 35° with the ground.a) What should be the initial velocity of the ball so that it hits a target
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Answer:

a.18.5 m/s

b.1.98 s

Explanation:

We are given that

\theta=35^{\circ}

a.Let v_0 be the initial velocity of the ball.

Distance,x=30 m

Height,h=1.8 m

v_x=v_0cos\theta=v_0cos35

v_y=v_0sin\theta=v_0sin35

x=v_0cos\theta\times t=v_0cos35\times t

t=\frac{30}{v_0cos35}

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Substitute the values

1.8=v_0sin35\frac{30}{v_0cos35}-\frac{1}{2}(9.8)(\frac{30}{v_0cso35})^2

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Initial velocity of the ball=18.5 m/s

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t=\frac{30}{18.5cos35}

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Hence, the time for the ball to reach the target=1.98 s

7 0
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