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4 years ago

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When drawing a free-body diagram for an object on an inclined surface, which way does the force of gravity point? A. Straight do

wn B. Straight up C. Perpendicular to the surface D. Parallel to the surface

1 answer:

babunello [35]4 years ago

8 0

A- Straight Down

Remember wherever the object is, whether it is straight or inclined, gravitational pull will always act downwards.

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PLEASE HELP! Please get these right

umka2103 [35]

Green. This is because chlorophyll reflects the color green, which is why we see it as this color.

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3 years ago

A 6 V battery is connected to a 24 ohm resistor to create a circuit. The 6 V battery is then replaced with a 12 V battery. How d

11Alexandr11 [23.1K]

Answer:

1.) The current is doubled

2.) moving a magnet up and down near the wire

3.) An electric current in the wire produces a magnetic field.

4.) Distance between Particles (m)

Explanation:

1.) When 6 V battery is connected to a 24 ohm resistor to create a circuit, using ohms law, V = IR

Current I = 6/24 = 0.25 A

When the The 6 V battery is replaced with a 12 V battery,

Current I = 12/24 = 0.5 A

Therefore, The current is doubled

2.) Electric current will be induced when moving a magnet up and down near the wire

3.) An electric current in the wire produces a magnetic field.

4.) Distance between Particles (m)

The force of attraction between two different masses is inversely proportional to the square of the distance between them.

6 0

4 years ago

Light travels at 300,000 km per second. Mars is 56 million km away from Earth. How many seconds does it take light to travel fro

alina1380 [7]

Answer:

<em> It takes 186.67 second for the light to travel from Mars to earth.</em>

Explanation:

Light: Light is a visible form of energy which is radiated outward from a source. Light travels in a straight line, and this phenomenon is called rectilinear propagation of light.

S = d/t .......................... Equation 1

making t the subject of the equation

t = d/S ......................... Equation 2

Where S = speed of light, d = distance between the earth and Mars, t = time

<em>Given: d = 56000000 km, S = 300000 km per seconds.</em>

<em>Substituting these values into equation 2</em>

<em>t = 56000000/300000</em>

<em>t = 186.67 seconds.</em>

<em>Thus it takes 186.67 second for the light to travel from Mars to earth.</em>

4 0

3 years ago

What quantity describes how quickly you change how fast you are traveling or how quickly you change direction?

Margarita [4]

Velocity = The speed and direction that an object is moving at

5 0

3 years ago

A 2.64-kg copper part, initially at 400 K, is plunged into a tank containing 4 kg of liquid water, initially at 300 K. The coppe

marin [14]

Answer:

a) $T_f=305.7049\ K$

b) $\Delta S=313.51\ J.K^{-1}$

Explanation:

Given:

mass of copper, $m_c=2.64\ kg$

initial temperature of copper, $T_{ic}=400\ K$

specific heat capacity of copper, $c_c=385\ J.kg^{-1}.K^{-1}$

mass of water, $m_w=4\ kg$

initial temperature of water, $T_{iw}=300\ K$

specific heat capacity of water, $c_w=4200\ J.kg^{-1}.K^{-1}$

a)

<u>∵No heat is lost in the environment and the heat is transferred only between the two bodies:</u>

Heat rejected by the copper = heat absorbed by the water

$2.64\times 385\times (400-T_f)= 4\times 4200\times (T_f-300)$

$T_f=305.7049\ K$

b)

<u>Now the amount of heat transfer:</u>

$Q=m_c.c_c.(T_{ic}-T_{f})$

$Q=2.64\times 385\times (400-305.7049)$

$Q=95841.5841\ J$

∴Entropy change

$\Delta S=\frac{dQ}{T}$

$\Delta S=\frac{95841.5841}{305.7049}$

$\Delta S=313.51\ J.K^{-1}$

5 0

4 years ago