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4 years ago

What is science? APEX

Physics

2 answers:

zmey [24]4 years ago

8 0

The answer is B. Learning about the physical world through observation

True [87]4 years ago

6 0

A. Attempting to solve ethical problems through research.

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A stone of mass m is thrown upwards at an angle φ. The moment the stone leaves your hand it has an acceleration (friction is neg

Lelechka [254]

The correct answer is:

= g

Explanation:

When the object leaves the hand it has a force acted on it mainly it’s weight.

5 0

3 years ago

Car enthusiasts often lower their cars closer to the ground as a matter of style. James wants to lower his car by replacing all

Alexandra [31]

Answer:

$\Delta h=0.0364\ m=3.64\ cm$

Explanation:

Given:

change in stiffness constant of the spring on replacing the original springs, $\delta k=5355\ N.m^{-1}$

mass of the car, $m=1455\ kg$

initial length of the original car-spring before compression, $l_i=12\ cm=0.12\ m$

final length of the original car-spring after compression, $l_f=8.55\ cm=0.0855\ m$

So, weight of the car:

$w=m.g$

$w=1455\times 9.81$

$w=14273.55\ N$

Now the spring constant of original spring:

$w=4k_o.(l_i-l_f)$ (since 4 springs are in parallel)

$14273.55=4k_o\times (0.12-0.0855)$

$k_o=103431.522\ N.m^{-1}$

So the stiffness constant of the new springs:

$k_n=k_o-\delta k$

$k_n=103431.522-5355$

$k_n=98076.522\ N.m^{-1}$

Now the height lowered:

$w=k_n.4\Delta h$ (since 4 springs are in parallel)

$14273.55=4\times98076.522\times \Delta h$

$\Delta h=0.0364\ m=3.64\ cm$

5 0

4 years ago

A metal wire is in thermal contact with two heat reservoirs at both of its ends. Reservoir 1 is at a temperature of 686 K, and r

steposvetlana [31]

Answer:

ΔS = 3.09 J/K

Explanation:

Entropy is defined as the magnitude of disorder in a system. Mathematically, entropy change is given as, the heat absorbed or released by a system divided by the change in absolute temperature. So, the formula for entropy change is as follows:

ΔS = ΔQ/ΔT

where,

ΔS = Change in Entropy of Metal Wire = ?

ΔQ = Heat Conducted through Wire = 1216 J

ΔT = Difference in Temperature = 686 K - 292 K = 394 K

Therefore,

ΔS = 1216 J/394 K

ΔS = 3.09 J/K

7 0

3 years ago

Is steel considered matter

Ugo [173]

Answer:

yes. everything around you is matter including you!

5 0

3 years ago

Read 2 more answers

Un hamster fait tourner sa cage de 27cm de diamètre a raison de 14tours par minute .quel est le module de l accélération centrip

Scilla [17]

Answer:

Explanation:

a_c = ω²R

14 rev/min (2π rad/rev)(1 min/60 s) = 1.466 rad/s

a_c = 1.466²(0.27/2)

a_c = 0.29 m/s²

Le hamster est lent

6 0

3 years ago