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alisha [4.7K]
3 years ago
5

What is the ideal mechanical advantage of a lift that allows you raise a 90.0-kg refrigerator with 80.0 N of force?

Physics
1 answer:
Sholpan [36]3 years ago
5 0

Answer:

11

Explanation:

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The wavelength of violet light is about 425 nm (1 nanometer = 1 × 10−9 m). what are the frequency and period of the light waves?
BigorU [14]

1. Frequency: 7.06\cdot 10^{14} Hz

The frequency of a light wave is given by:

f=\frac{c}{\lambda}

where

c=3\cdot 10^{-8} m/s is the speed of light

\lambda is the wavelength of the wave

In this problem, we have light with wavelength

\lambda=425 nm=425\cdot 10^{-9} m

Substituting into the equation, we find the frequency:

f=\frac{c}{\lambda}=\frac{3\cdot 10^{-8} m/s}{425\cdot 10^{-9} m}=7.06\cdot 10^{14} Hz


2. Period: 1.42 \cdot 10^{-15}s

The period of a wave is equal to the reciprocal of the frequency:

T=\frac{1}{f}

The frequency of this light wave is 7.06\cdot 10^{14} Hz (found in the previous exercise), so the period is:

T=\frac{1}{f}=\frac{1}{7.06\cdot 10^{14} Hz}=1.42\cdot 10^{-15} s


4 0
3 years ago
Read 2 more answers
The bogus pipeline is an instrument that was developed to measure attitudes that are otherwise difficult to measure because ____
VMariaS [17]

Answer:

of motivations to give a socially desirable response

Explanation:

The bogus pipeline is nothing but a polygraph machine which is fake.

With the help of a polygraph test it can be determined whether a person is telling the truth. This is done by measuring physiological indicators of a human being such as  blood pressure, respiration, pulse, and skin conductivity.

The bogus pipeline appears to be like a real polygraph machine. It is assumed that people will be truthful as they believe that the machine is real. Nowadays, it is used to measure attitude towards a certain stimulus.

6 0
3 years ago
-List ten different waves that you encounter in everyday life. Be specific, don't just say "sound
Nady [450]

Answer:

1.Radio waves from using your TV.

2. microwaves you are in satellites.

3.UV light waves come from sunlight

4.x ray waves used at the doctors office

5. infrared waves are in remote controls when sending signals.

I don't know if I can think of another 5 right now. but I hope this helps.

6 0
3 years ago
class 7 Physics answera plot measuring 2 km in length and 1 by 2 km in breadth has area of how many hectare ​
motikmotik

Answer:

Area of plot in hectare = 100 hectare

Explanation:

Given;

Length of plot = 2 km

Width of plot = 1/2 km = 0.5 km

Find:

Area of plot in hectare

Computation:

Area of plot = Length x width

Area of plot = 2 x 0.5

Area of plot = 1 square kilometer

1 square kilometer = 100 hectare

Area of plot in hectare = 1 x 100

Area of plot in hectare = 100 hectare

7 0
3 years ago
ASAP I will give 34 points please give a good answer
liraira [26]
Well, what's a well? Basically, to obtain water found in an aquifer, a well is a hole drilled into the earth. To pull water from the soil, a pipe and a pump are used and a screen filters out un Wells are drilled into the rock as deep as 1,000 feet to enter the water. ... Through a well pump, water flows through this casing. Above level, the well structure is closed off. From a pipe connected between the casing and a pressure tank (generally located in the basement of your house), the water then reaches your home.
6 0
3 years ago
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