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4 years ago

1

Physics

2 answers:

Naily [24]4 years ago

8 0

Answer:

It goes from East to West.

Explanation:

Over [174]4 years ago

6 0

Answer:

From West to East

Explanation:

Cus it goes across the sky West to east

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Why does the liquid thermometer work?

Mashutka [201]

Mercury used to be used

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4 years ago

What is the mass of a black hole which has the radius of the sun(696,340 km).

Leya [2.2K]

It has a diameter of about 78 billion miles. For perspective, that's about 40% the size of our solar system, according to some estimates. And it's estimated to be about 21 billion times the mass of our sun. So there you have it, black holes can be millions of times larger than suns and planets or as small as a city.

8 0

2 years ago

A steel ball with mass m=5.21 g is moving horizontally with speed ????=412 m/s when it strikes a block of hardened steel with ma

docker41 [41]

Answer:

a) The speed of the block immediately after the collision is $v_{2f}=(0.289\±0.002)m/s$ .

b) The impulse exerted on the block is $p_{2}=(4.2772\±0.0296)kg*m/s$ .

Explanation:

a) As this is a perfectly elastic collision, we can use the formula $v_{2f}=(\frac{2m_{1} }{m_{1}+m_{2}} ) v_{1i}+ (\frac{m_{2}-m_{1}}{m_{1}+m_{2}} )v_{2i}$ , due $v_{2i}=0m/s$ , we obtain $v_{2f}=(\frac{2m_{1} }{m_{1}+m_{2}} ) v_{1i}$ . Then with the data that we know $m_{1}=5.21g=0.00521kg, m_{2}=14.8kg$ and $v_{1i}=412m/s$ , therefore $v_{2f}=(\frac{2(0.00521kg) }{0.00521kg+14.8kg} ) 412m/s=0.289m/s$ or $v_{2f}=(0.289\±0.002)m/s$ adding uncertainty.

b) Now that we know the speed we can use $p_{2}=m_{2}*v_{f2} =14.8kg*(0.289\±0.002)m/s=(4.2772\±0.0296)kg*m/s.$

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4 years ago

The lowest note on the piano has the longest string to vibrate. How does the lowest note compare if you consider the column of a

SashulF [63]

The piano strings for low notes are heavier, have more inertia, and vibrate at a lower frequency a lower pitch than lighter strings of the same string tension. Loudness involves how hard the keys are struck, which affects the amplitudes of the vibrating strings. the touch sensitivity of the piano distinguishes it from earlier.

Do you undertand?????

3 0

4 years ago

An elevator is moving downward when someone presses the emergency stop button. The elevator comes to rest a short time later. Gi

OLga [1]

Answer:

Answer: - , +

Explanation:

Velocity and Acceleration

In general terms, velocity and acceleration in the plane are both vectors with two components. They don't have 'sign' but magnitude and direction. If we know motion is restricted to a simple line, then we can define the positive and negative references.

In vertical motion, the positive reference is commonly pointed upwards, but if we chose the opposite way, the results shouldn't change in magnitude, just their signs. Let's choose like proposed, the positive direction upwards.

Since the elevator was moving downwards, its velocity is negative. When the button is pushed, it continues to move downwards, but slower. Its velocity is still negative.

The acceleration has the same sign as the velocity if it tends to increase the magnitude of the object, and is negative in the opposite case. Let's look at the formula

$\displaystyle a=\frac{v_f-v_o}{t}$

In this case, $v_f=0$ because the elevator will eventually stop, and $v_o$ is negative. It means the acceleration is

$\displaystyle a=\frac{-v_o}{t}$

It results in a positive value

$\boxed{Answer: -,+}$

Note: If we chose the opposite references, then the answer would be: +,-

5 0

3 years ago