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2 years ago

13

When a ball is pushed into water, it moves upward why

2 answers:

andrezito [222]2 years ago

5 0

Explanation:

This happens because there is a buoyant force acting on the ball.

Jlenok [28]2 years ago

5 0

Boyancy, and air inside of the ball.

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In 4 -5 sentences, summarize the science of the sport of curling and how it relates to friction

zalisa [80]

Well, a curler uses heat to calm down friction so I am not sure

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2 years ago

Write the equation of motion gover the centre of mass<br><br><br>

Nataly [62]

Answer:

write the equation of motion go over the centre of mass

Explanation:

the center of mass of a distribution of mass in space (sometimes referred to as the balance point) is the unique point where the weighted relative position of the distributed mass sums to zero. This is the point to which a force may be applied to cause a linear acceleration without an angular acceleration.

6 0

3 years ago

Two cars A and B are moving with velocities 20 m/s and 15 m/s in the direction east and west respectively. If

Sphinxa [80]

Answer:

<u>Distance</u><u> </u><u>between</u><u> </u><u>them</u><u> </u><u>is</u><u> </u><u>4</u><u>,</u><u>2</u><u>0</u><u>0</u><u> </u><u>meters</u><u>.</u>

Explanation:

Consinder car A:

${ \bf{distance = speed \times time }}$

substitute:

$distance = 20 \times (2 \times 60) \\ = 2400 \: m$

Consider car B:

$distance = 15 \times (2 \times 60) \\ = 1800 \: m$

since these cars move in opposite directions, distance between them is their summation:

$distance \: between = { \sum(distance \: of \: each \: car)} \\ = 2400 + 1800 \\ = 4200 \: m$

3 0

2 years ago

What will happen if an stop able item was to hit an unbreakable item

nataly862011 [7]

It would either break or stop depends on the density

7 0

3 years ago

A parallel plate capacitor filled with air with plate area 2-cm2 and plate separation of 0.5 mm is connected to a 12 V batter an

pashok25 [27]

Answer:

a) The charge of the capacitor is 4.25x10⁻¹¹C

b) The charge of the capacitor is 4.25x10⁻¹¹C because the battery is disconnected.

c) The potential difference across the plates is 18 V

d) The work is 7.64x10⁻¹⁰J

Explanation:

The capacitance of the capacitor is equal to:

$C=\frac{e_{0}A }{d}$

A = 2 cm² = 0.0002 m²

d = 0.5 mm = 0.0005 m

Replacing:

$C=\frac{8.85x10^{-12}*0.0002 }{0.0005} =3.54x10^{-12} F = 3.54pF$

a) The charge of the capacitor is equal to:

Q = C*V = 3.54 * 12 = 42.48 pC = 4.25x10⁻¹¹C

b) The charge is the same because the battery is disconnected (Q = 4.25x10⁻¹¹C)

c) If distance is increased, we have:

$C=\frac{8.85x10^{-12}*0.0002 }{0.00075} =2.36x10^{-12} F=2.36pF$

The potential is:

$V=\frac{Q}{C} =\frac{42.48}{2.36} =18V$

d) The work done is equal to:

$W=VQ=18*42.48=764.6pJ=7.64x10^{-10} J$

3 0

2 years ago

Read 2 more answers