PHYSICS MIDDLE SCHOOL

How do simple machines make work easier? A.
They add energy to the work.

B.
They increase the force needed to work.

C.
They reduce the speed of work.

D.
They increase the distance over which a force is applied.
C.?

Answers

Answer 1
Answer:

Answer:  D.  They increase the distance over which a force is applied.

Explanation:

Simple machines are basic mechanical devices which make our work easier like lever, pulley, wheel and axle, inclined plane, wedge and screw. The magnitude of the force or direction is altered using a simple machine. They increase the distance over which a force is applied. They use mechanical advantage to increase the magnitude of the force.

Answer 2
Answer: It is A: They add energy to the work

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A sound wave is traveling at a speed of 330 m/s. If the frequency of the wave is 660 Hz, what is the wavelength of the sound wave?2 m
330 m
990 m
0.5 m

Answers

Answer:

The wavelength of the sound wave traveling at 330 m/s is 0.5 m.

Explanation:

Given:

Speed of sound wave is, v=330\ m/s

Frequency of the sound wave is, f=660\ Hz

Speed of a sound wave is related to its frequency and wavelength as:

v=f\lambda, where, \lambda is the wavelength.

Now, plug in 330 for v, 660 for f and solve for \lambda. This gives,

330=660\lambda\n\lambda=(330)/(660)=0.5\ m

Therefore, the wavelength of the sound wave traveling at 330 m/s is 0.5 m.

Explain how mirrors can produce images that are larger or smaller than life size, as well as upright or inverted

Answers

Answer:

1) When d_(o) < d_(i) (hence  d_(o) < f ) and they are both in front of the mirror (positive), the image will be larger and inverted

2) When d_(o) > d_(i) (and d_(o) < f ) such that they are both positive (in front of the mirror), the image will be smaller and inverted

3) When the image is behind the mirror, for convex mirrors and the object is in front the image will be uptight. The magnification of the image will be the ratio of the image distance to the object distance from the mirror

Explanation:

The position of an object in front of a concave mirror of radius of curvature, R, determines the size and orientation of the image of the object as illustrated in the mirror equation

(1)/(f)=(1)/(d_(o)) + (1)/(d_(i))

Magnification, \, m = (h_(i))/(h_(o)) = -(d_(i))/(d_(o))

Where:

f = Focal length of the mirror = R/2

d_(i) = Image distance from the mirror

d_(o) = Object distance from the mirror

h_(i) = Image height

h_(o) = Object height

d_(o) is positive for an object placed in front of the mirror and negative for an object placed behind the mirror

d_(i) is positive for an image formed in front of the mirror and negative for an image formed behind the mirror

m is positive when the orientation of the image and the object is the same

m is negative when the orientation of the image and the object is inverted

f and R are positive in the situation where the center of curvature is located in front of the mirror (concave mirrors) and f and R are negative in the situation where the center of curvature is located behind the mirror (convex mirrors)

∴ When d_(o) < d_(i) (hence  d_(o) < f ) and they are both in front of the mirror (positive), the image will be larger and inverted

When d_(o) > d_(i) (and d_(o) < f ) such that they are both positive (in front of the mirror), the image will be smaller and inverted

When the image is behind the mirror, for convex mirrors and the object is in front the image will be uptight. The magnification of the image will be the ratio of the image distance to the object distance from the mirror.

What is its main function in the atmosphere for nitrogen

Answers

Nitrogen is very cold. If touched, it could freeze a person instantly. It is used in our atmosphere as a way for us to not be harmed by the harmful rays of the sun. The coldness helps prevent us from getting the full intense heat of the sun that will kill us.

In what way does varying the length of a string of a violin change the vibration and how does this affect the sound that's produced?

Answers

The wavelength is the so-called "fundamental" wavelength, or the "first mode." Thus, the wavelength of the string's vibration is defined by the supports, and has nothing whatsoever to do with mass or elasticity.

A stuntman jumps from the roof of a building to the safety net below. How far has the stuntman fallen after 2.3 seconds? A. 25.9 m B. 21.2 m C. 9.8 m D. 11.3 m

Answers

Answer:

answer should be 25.9

Explanation:

Answer:

25.9 m

Explanation:

Which of the following is not needed to make a model of the water cycle?

Answers

grass.. dirt... land things

Answer:

The answer is a drain
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