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3 years ago

Convection currents form when warm air rises and cold air sinks. What causes the warm air to rise and the cold air to sink?

Physics

2 answers:

irina1246 [14]3 years ago

5 0

Answer:

The diference in density

Explanation:

astraxan [27]3 years ago

4 0

The warm air rises, because it has become less dense as a result of increase in temperature from heating. Since it is heated, it expands and becomes less dense and such it rises.

The cold air, as result of decrease in temperature contracts, and becomes denser. The cold air is denser than the warm air. The cold air, being the denser sinks. So the cold air sinks because it is denser and heavier than warm air.

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Erica throws a tennis ball against a wall, and it bounces back. Which force is responsible for sending the ball back to Erica?

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Kinetic energy is responsible for this

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What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s/s

kakasveta [241]

Force (f) = ?

Acceleration (a) = 196 m/s^2

Mass (m) = 0.25 kg

F = (m) • (a)

F = (0.25) • (196)

F = 49 N

Answer : 49 N

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Consider the 65 N light fixture supported as in the figure. Find the tension in the supporting wires.

ASHA 777 [7]

By using Lami's theorem formula, the tension in the supporting wires is 48.6 Newtons

TENSION

Tension is also a force having Newton as S.I unit.

The tension in the wire will be the same.

This question can be solved by using either vector diagram or by using Lami's theorem.

The sum of two given angles = 42 + 42 = 84 degrees

The third angle = 180 - 84 = 96 degrees.

Below is the Lami's theorem formula

$\frac{T}{sin\alpha } = \frac{T}{sin\beta } = \frac{W}{sinY}$

Where

$\alpha = \beta$ = 42 + 90 = 132 degrees

Y = 96 degrees

W = 65 N

By using the formula, we have

$\frac{T}{sin\alpha } = \frac{W}{sinY}$

T/sin 132 = 65/sin96

Cross multiply

T = 0.743 x 65.57

T = 48.56 N

Therefore, the tension in the supporting wires is 48.6 Newtons approximately.

Learn more about Tension here: brainly.com/question/24994188

3 0

2 years ago

An artillery shell of mass 30 kg has a velocity of 250 m/s vertically upward. The shell explodes into two pieces; immediately af

olga_2 [115]

Answer:

9654.34 m

Explanation:

from conservation of momentum

$\begin{aligned}30 \times 250 &=-10 \times 120+20 \times V \\20 V &=30 \times 250+10 * 120 \\V &=\frac{30 \times 250+10 \times 120}{20}=435 \mathrm{~m} / \mathrm{s}\end{aligned}$

And from Conservation of Energy

$\frac{1}{2} m v^{2}=m g h\\h=\frac{v^{2}}{2 g}\\h=\frac{(435(m/s))^{2}}{2 \times 9.8(m/s^{2} )}\\h=9654.34 (m)$

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2 years ago