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4 years ago

What are the three main types of rocks?

Physics

2 answers:

aksik [14]4 years ago

5 0

metamorphic, sedimentary, igneous

riadik2000 [5.3K]4 years ago

4 0

Metamorphic, igneous, and sedimentary

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Metals can be described as shiny while nonmetals can be described as dull. What physical property do these terms describe? A) co

lbvjy [14]

The correct answer is C. luster refers to how much light is in an object or how much reflects off. hope this helps, have an amazing day :)

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3 years ago

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4 years ago

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A drag racer crosses the finish line doing 212 mi/h and promptly deploys her drag chute. (A.) what force must the drag chute exe

Svet_ta [14]

initial speed of the racer is given as

$v_i = 212 mi/h$

$v_i = 212*\frac{1609}{3600} = 94.75 m/s$

after applied force the final speed is given as

$v_f = 45 mi/h$

$v_f = 45 * \frac{1609}{3600} = 20.11 m/s$

now during this speed change the racer will cover total distance 185 m

so here we will use kinematics

$v_f^2 - v_i^2 = 2 a d$

$20.11^2 - 94.75^2 = 2*a*185$

$a = -23.2 m/s^2$

now the force that chute will exert on the racer will be given as

$F = ma$

$F = 898* 23.2$

$F = 2.1* 10^4 N$

B) here following is the strategy for solving it

1. first we used kinematics to find the acceleration of the car

2. then we used Newton's II law (F = ma) to find the force

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3 years ago

A sphere has surface area 1.25 m2, emissivity 1.0, and temperature 100.0°C. What is the rate at which it radiates heat into empt

Yuri [45]

The total power emitted by an object via radiation is:
$P=A\epsilon \sigma T^4$
where:
A is the surface of the object (in our problem, $A=1.25 m^2$
$\epsilon$ is the emissivity of the object (in our problem, $\epsilon=1$ )
$\sigma = 5.67 \cdot 10^{-8} W/(m^2 K^4)$ is the Stefan-Boltzmann constant
T is the absolute temperature of the object, which in our case is $T=100^{\circ} C=373 K$

Substituting these values, we find the power emitted by radiation:
$P=(1.25 m^2)(1.0)(5.67 \cdot 10^{-8}W/(m^2K^4)})(373 K)^4=1371 W = 1.4 kW$
So, the correct answer is D.

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4 years ago

Trace the path of energy from the sun to mechanical energy in an organism

densk [106]

Sun to plants. Plants use photosynthesis to create sugar for energy. Animals then eat the plant and the energy they made is absorbed by the animal.

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3 years ago

What are the three main types of rocks?​

What are the three main types of rocks?