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bazaltina [42]
2 years ago
7

14. Saeed is pulling a 6 kg heavy rock with an upward force of 40 N but does not succeed to lift it up. What is the magnitude of

the normal force on the rock?
Physics
1 answer:
NemiM [27]2 years ago
6 0

Answer:

58.8 N

Explanation:

The normal force is calculated as equal to the perpendicular component of the gravitational force.

Thus; N = mg

We are given m = 6 kg

Thus;

N = 6 × 9.8

N = 58.8 N

Thus, magnitude of normal force on the rock = 58.8 N

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To find or discover by investigation?
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Ultrasonic images are obtained from the inside organs of our body. This process uses which property of sound wave?
Temka [501]

This question involves the concepts of echo, ultrasonic images, ultrasonic sound waves.

The process of ultrasonic images uses the "echo" property of the sound waves.

Echo is the property of the sound wave by the virtue of which the sound wave reflects back to the source of the sound after hitting a surface or an object.

Ultrasonic images are obtained from inside organs of our body. This process involves the use of ultrasonic sound waves that have a frequency greater than 20,000 Hz. These sound waves are out of the range of audible sound by the human ear. When these ultrasonic sound waves are sent in form of pulses into the human body by the use of probes, they reflect back from the tissues of different organs to the probe. The probe then records the reflection properties of these sound waves and displays them in form of an image, known as ultrasonic images.

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The attached picture shows the process of ultrasonic imaging.

4 0
2 years ago
You could use an elevator or the stairs to lift a box to tenth floor.which has greater power?
erastova [34]

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has to come from your muscles.

An elevator gets its power from the electric motors that lift it.  All YOU
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All of this is a big part of the reason why elevators have become so
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7 0
2 years ago
When do you turn your wheels sharply left before backing slowly in a parallel parking maneuver?
Alex_Xolod [135]

Answer:

What is C - when your front bumper is even with the front vehicles back bumper.

Explanation:

Good Luck

8 0
2 years ago
The first law of thermodynamics relates the heat transfer into or out of a system to the change of internal and the work done on
Artyom0805 [142]

Answer:

The heat transferred into the system is 183.5 J.

Explanation:

The first law of thermodynamics relates the heat transfer into or out of a system to the change of internal and the work done on the system, through the following equations.

ΔU = Q - W

where;

ΔU  is the change in internal energy

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Given;

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155 = Q - 28.5

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Q = 183.5 J

Therefore, the heat transferred into the system is 183.5 J.

4 0
2 years ago
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