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3 years ago

Which of newton's laws explains why your hands get red when you press them hard against a wall?

1 answer:

3 0

The Newton's law that explains why the hands get red when you press them hard against a wall is Newton's third law. When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

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Phase Changes

worty [1.4K]

Answer:

The answer to your question below

Explanation:

Processes from solid to liquid or from liquid to gas absorb energy.

Processes from gas to liquid or liquid to solid release energy.

Condensation phase change that releases heat

Freezing phase change that releases heat

Melting phase change that absorbs heat

Sublimation phase change that absorbs heat

Vaporization phase change that absorbs heat

7 0

3 years ago

A rock is dropped from a 134-m-high cliff. how long does it take to fall (a) the first 67.0 m and (b) the second 67.0 m?

____ [38]

A rock is dropped from a 100-m-high cliff. How long do the first 50 meters and the second 50 meters take to fall?

(a) The first 50 meters:

h1 = 0.5 x a x t12

50 m = 0.5% x 9.8% x t12

t1 = 3.19 s

50 meter fall time equals 3.19 seconds.

(a) Counting all 100 meters:

h2 = 0.5 x a x t22

100 m = 0.5% x 9.8% x t22

t2 = 4.52 s

Time to fall 50 meters is equal to t2 - t1 = 1.33 s.

<h3>What is meter?</h3>

The Earth's circumference is around 40000 km, according to the original definition of the metre in 1793, which was one ten-millionth of the distance between the equator and the North Pole on a great circle. The metre was redefined in 1799 using a model metre bar (the actual bar used was changed in 1889). The definition of the metre in terms of a certain number of wavelengths of a specific krypton-86 emission line was made in 1960.

To know more about meter, visit;

brainly.com/question/14475998

#SPJ4

4 0

2 years ago

A man pushing a mop across a floor causes it to undergo two displacements. The first has a magnitude of 152 om and makes an angl

aliya0001 [1]

Answer:

D₂= 167,21 cm : Magnitude of the second displacement

β= 21.8° , countercockwise from the positive x-axis: Direction of the second displacement

Explanation:

We find the x-y components for the given vectors:

i: unit vector in x direction

j:unit vector in y direction

D₁: Displacement Vector 1

D₂: Displacement Vector 2

R= resulta displacement vector

D₁= 152*cos110°(i)+152*sin110°(j)=-51.99i+142.83j

D₂= -D₂(i)-D₂(j)

R= 131*cos38°(i)+ 131*sin38°(j) = 103.23i+80.65j

We propose the vector equation for sum of vectors:

D₁+ D₂= R

-51.99i+142.83j+D₂x(i)-D₂y(j) = 103.23i+80.65j

-51.99i+D₂x(i)=103.23i

D₂x=103.23+51.99=155.22 cm

+142.83j-D₂y(j) =+80.65j

D₂y=142.83-80.65=62.18 cm

Magnitude and direction of the second displacement

$D_{2} =\sqrt{(D_{x})^{2} +(D_{y} )^{2} }$

$D_{2} =\sqrt{(155.22)^{2} +(62.18 )^{2} }$

D₂= 167.21 cm

Direction of the second displacement

$\beta = tan^{-1} \frac{D_{y}}{D_{x} }$

$\beta = tan^{-1} \frac{62.18}{155.22 }$

β= 21.8°

D₂= 167,21 cm : Magnitude of the second displacement

β= 21.8.° , countercockwise from the positive x-axis: Direction of the second displacement

6 0

4 years ago

calculate the densities of the following materials. Material A has a volume of 2 cm 3 and mass of 30 g.

vladimir2022 [97]

Answer:

0.015kgcm^3

Explanation:

density = mass / volume

density = (30/1000) / 2

= 0.015kgcm^3

8 0

4 years ago

A baseball is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stop watch measures the stone's ti

Oksana_A [137]

Complete Question

A baseball is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stop watch measures the ball's time in the air until it hits the ground to be 4.3 s. How far does the baseball travel horizontally?

Answer:

The distance covered horizontally is $d = 43 \ m$