1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nana76 [90]
3 years ago
11

The one invention that has made many complex machines possible is the invention of the:

Physics
1 answer:
Dafna11 [192]3 years ago
3 0
Hello!

We can point to the invention of the wheel . The wheel  invention made ​​possible the production of hundreds of complex machinery.

Hugs!!
<span>
</span>
You might be interested in
Strontium 3890Sr has a half-life of 28.5 yr. It is chemically similar to calcium, enters the body through the food chain, and co
patriot [66]

Answer:

Thus the time taken is calculated as 387.69 years

Solution:

As per the question:

Half life of ^{3890}Sr\, t_{\frac{1}{2}} = 28.5 yrs

Now,

To calculate the time, t in which the 99.99% of the release in the reactor:

By using the formula:

\frac{N}{N_{o}} = (\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}

where

N = No. of nuclei left after time t

N_{o} = No. of nuclei initially started with

\frac{N}{N_{o}} = 1\times 10^{- 4}

(Since, 100% - 99.99% = 0.01%)

Thus

1\times 10^{- 4} = (\frac{1}{2})^{\frac{t}{28.5}}}

Taking log on both the sides:

- 4 = \frac{t}{28.5}log\frac{1}{2}

t = \frac{-4\times 28.5}{log\frac{1}{2}}

t = 387.69 yrs

5 0
3 years ago
You want to lean your dad's ladder on a smooth wall. If the mass of ladder is 4.42 kg and coefficient
iren [92.7K]

Answer:

angle minimum   θ = 41.3º

Explanation:

For this exercise let's use Newton's second law in the condition of static equilibrium

    N - W = 0

    N = W

The rotational equilibrium condition, where we place the axis of rotation on the wall

We assume that counterclockwise rotations are positive

     fr (l sin θ) - N (l cos θ) + W (l/2 cos θ) = 0

     

the friction force formula is

     fr = μ N

     fr = μ W

we substitute

      μ m g l sin θ - m g l cos θ + mg l /2   cos θ = 0

      μ sin θ - cos θ + ½ cos θ= 0

         

       μ sin θ - ½ cos θ = 0

       sin θ / cos θ = 1/2 μ

       tan θ = 1/2 μ

       θ = tan⁻¹ (1 / 2μ)

       θ = tan⁻¹ (1 (2 0.57))

      θ = 41.3º

7 0
3 years ago
energy can be transfered from one type to anogher in any convection some of the energy is lost ti the enviornment as
lianna [129]
<span>Energy can be transformed from one type to another in any convection. Some of the energy is lost to the environment as HEAT.</span>
7 0
3 years ago
Read 2 more answers
Consider the incomplete equation below
kati45 [8]

Answer:

Nuclear fusion produces elements that are heavier than helium.

Explanation:

6 0
3 years ago
Read 2 more answers
Pls place the words in the right place I'll give brainless and the points!
Sphinxa [80]

Explanation:

you measure temperature in degrees celsius using a thermometer. Thermal energy is measured in joules. A larger volume of water will take longer to heat up but will store more energy than the smaller object. However, a smaller object will lose it's heat faster than a larger object. A cup of tea has less thermal energy than a swimming pool.

5 0
3 years ago
Other questions:
  • A Truck with a mass of 1500 kg is decelerated At a rate of 5m/s2. how much force did this require
    11·1 answer
  • WheN a car is driven some distance the air pressure in the tyre increases,why?
    5·1 answer
  • The four seasons are caused by a planet’s:
    10·1 answer
  • Which statement is true?
    11·1 answer
  • A portable television using a 12 volt, 3 Ah rechargeable battery can operate for a period of about 6 hours. What is the average
    7·1 answer
  • Zero gauge wire has a diameter of 0.32in and can carry a sustained current of 150A safely. What is the magnetic field a distance
    13·1 answer
  • Name a common product produced by blow molding.
    12·1 answer
  • A partially inflated balloon is faded over the open end of a glass beaker that contains water the beaker is placed in an ice bat
    8·1 answer
  • 1. Light traveling in air (n1=1) hits a piece of glass at an angle of 30 degrees. The light refracts in the glass at an angle of
    12·1 answer
  • PLS HELP! I’ll give Brainly!
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!