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3 years ago

A car accelerates from a rest at -3 m/s2. What is the displacement after 4.7 sec?

Physics

2 answers:

Alexeev081 [22]3 years ago

4 0

Answer:

I believe it would be 21 m/s

nikitadnepr [17]3 years ago

3 0

The answer is 21/ms I bel

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Clara's grandfather is a captain of a cargo ship. He prefers to navigate his ship through the moderate neap tides. At these time

spayn [35]

Answer:

The phases are the first and third quarters.

Explanation:

During the first quarter of the moon phases, the line between Earth and the Sun is at a right angle to the line between Earth and the moon. At this time the moon has completed the first quarter of its orbit around the earth. At this point, half of the moon is fully reflecting light from the sun.

Also during the third quarter which is the last quarter, the line between the earth and the sun is at a right angle to the line between the earth and the moon. This is the time when the second half of the moon which was not illuminated during the first quarter becomes completely illuminated.

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3 years ago

Suppose that the oil in a hydraulic hoist is replaced by air. Would the hoist still operate as well? Explain.

shtirl [24]

No

The object/objects inside would have to be of a certain consistency/element/form so air wouldn’t work

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3 years ago

Jordan wants to know the difference between using a 60-W and 100-W lightbulb in her lamp. She calculates the energy it would tak

Andreas93 [3]

Answer:

The difference in the amount of energy transferred by the two bulbs is 1200 J.

Explanation:

The energy transferred by the two lightbulbs can be calculated with the given equation:

$E = P*t$

Where P is the power and t is the time

For the 60 W lightbulb:

$E_{60} = P*t = 60 W*30 s = 1800 J$

For the 100 W lightbulb:

$E_{100} = P*t = 100 W*30 s = 3000 J$

Hence, the difference in the amount of energy transferred is:

$E_{t} = E_{100} - E_{60} = 3000 J - 1800 J = 1200 J$

Therefore, the difference in the amount of energy transferred by the two bulbs is 1200 J.

I hope it helps you!

4 0

3 years ago

You blow across the open mouth of an empty test tube and producethe fundamental standing wave of the air column inside the testt

sertanlavr [38]

Answer:

(a). The frequency of this standing wave is 0.782 kHz.

(b). The frequency of the fundamental standing wave in the air is 1.563 kHz.

Explanation:

Given that,

Length of tube = 11.0 cm

(a). We need to calculate the frequency of this standing wave

Using formula of fundamental frequency

$f_{1}=\dfrac{v}{4l}$

Put the value into the formula

$f_{1}=\dfrac{344}{4\times0.11}$

$f_{1}=781.81\ Hz$

$f_{1}=0.782\ kHz$

(b). If the test tube is half filled with water

When the tube is half filled the effective length of the tube is halved

We need to calculate the frequency

Using formula of fundamental frequency of the fundamental standing wave in the air

$f_{1}=\dfrac{v}{4(\dfrac{L}{2})}$

Put the value into the formula

$f_{1}=\dfrac{344}{4\times\dfrac{0.11}{2}}$

$f_{1}=1563.63\ Hz$

$f_{1}=1.563\ kHz$

Hence, (a). The frequency of this standing wave is 0.782 kHz.

(b). The frequency of the fundamental standing wave in the air is 1.563 kHz.

6 0

4 years ago

Where is visible light located on the electromagnetic spectrum and why?

Marysya12 [62]

Radio waves, gamma-rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic ... The different types of radiation are defined by the the amount of energy found in the photons.

5 0

4 years ago