3 years ago

HELPPP!!! During a soccer game, a player kicks the winning goal. When is work being done by the player?

Physics

1 answer:

zimovet [89]3 years ago

7 0

Answer:

when the player’s foot is in contact with the ball

Explanation:

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Which method of popcorn popping transfers heat into the kernels without any direct

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Answer:

It is cause by radiation that's the answer

Explanation: the heat project sun rays towards the popcorn which causes it to pop

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3 years ago

Which one of the following accurately describes the force of gravity? A. The force of gravity is slightly lower at the bottom of

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Choice ' C ' is a correct statement.
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4 years ago

A 70.0-kg skier is sliding at 4 m/s when they slide down a 2m high hill. At the bottom of the hill they run into a large 2800 N/

Katarina [22]

Answer:

$\Delta x=245\ mm$

Explanation:

Given:

mass of skier, $m=70\ kg$

initial velocity of skier, $u=4\ m.s^{-1}$

height of the hill, $h=2\ m$

spring constant, $k=2800\ N.m^{-1}$

final velocity of skier before coming in contact of spring:

Using eq. of motion:

$v^2=u^2+gh$

$v^2=4^2+9.8\times 2$

$v=5.9666\ m.s^{-1}$

Now the time taken by the skier to reach down:

$v=u+gt$

$5.9666=4+9.8\ t$

$t=0.2007\ s$

Now we calculate force using Newton's second law:

$F=\frac{dp}{dt}$

$F=\frac{m(v-u)}{t}$

$F=\frac{70\times(5.9666-4)}{0.2007}$

$F\approx686\ N$

∴Compression in spring before the skier momentarily comes to rest:

$\Delta x=\frac{F}{k}$

$\Delta x=\frac{686}{2800}$

$\Delta x=0.245\ m$

$\Delta x=245\ mm$

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3 years ago

An electric field of 6.1x 10^5 N/C is directed along a charge 2.9 x 10^-19 C. What

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Answer:

Electric field is a function 1/r^2

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3 years ago

A stone is dropped into a deep well and hits the water after 3.41 seconds. How deep is The well?

TiliK225 [7]

Answer:

57.0 m

Explanation:

Given:

v₀ = 0 m/s

t = 3.41 s

a = 9.8 m/s²

Find: Δx

Δx = v₀ t + ½ at²

Δx = (0 m/s) (3.41 s) + ½ (9.8 m/s²) (3.41 s)²

Δx = 57.0 m

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3 years ago