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
WARRIOR [948]
3 years ago
12

What is the main reason why people use machines

Physics
2 answers:
Butoxors [25]3 years ago
5 0

Answer:

Machines are faster and more efficent

Explanation:

vova2212 [387]3 years ago
3 0

Answer: Machines makes work easier and save some time and is very fast. For example, an elder can't walk or stand very long, so people made a motorized wheelchair!

Explanation:

You might be interested in
Which change to a circuit is most likely to decrease its electrical power?
Harlamova29_29 [7]

Answer:

It's D

Explanation:

8 0
2 years ago
Read 2 more answers
Which of the following has more inertia?? bowling ball , hammer, Tennis ball feather
I am Lyosha [343]
The bowling ball would have the most inertia because it has the most mass. Inertia is the ability to resist a change in motion. So, it sort of makes sense that the more massive an object, the more resistance it has against outside forces. 
Bowling ball would be your answer since it has the most mass.
5 0
3 years ago
_ is where there are no particles or very few particles that are spaced out very far apart. (example: outer space)
irina1246 [14]
The answer is d - Vacuum
4 0
3 years ago
A spring with spring constant 11.5 N/m hangs from the ceiling. A 490 g ball is attached to the spring and allowed to come to res
Natalija [7]

Answer:

The time constant is \tau = 17.5 \ s    

Explanation:

From the question we are told that

   The spring constant is  k = 11.5 \  N/m

   The mass  of the ball is  m_b  = 490 \ g  = 0.49 \ kg

   The amplitude of the  oscillation t the beginning is x =  6.70 cm = 0.067 \  m

    The amplitude after time t is  x_t = 2.20 cm = 0.022 \  m

    The number of oscillation is N  = 30

Generally the time taken to attain the second amplitude is mathematically represented as

       t  = N  *  T                                            Here  T is the period of oscillation

         t = N * 2\pi \sqrt{\frac{m}{k} }

=>     t = 30 * 2 * 3.142 *  \sqrt{\frac{ 0.490}{11.5} }

=>     t = 38.88 \  s

Generally the amplitude at time t is mathematically represented as

         x(t) = x e^{-\frac{at}{2m} }

Here a is the damping  constant so

 at  t = 38.88 \  s ,  x_t = 2.20 cm = 0.022 \  m

So  

     0.022 = 0.067 e^{-\frac{a * 38.88}{2 * 0.490} }

=>  0.3284 = e^{-\frac{a * 38.88}{2 * 0.490} }

taking natural log of both sides

=>  ln(0.3284 ) = -\frac{a * 38.88}{2 * 0.490} }    

=>   a = 0.028

Generally the time constant is mathematically represented as

    \tau = \frac{m}{a}      

=> \tau = \frac{0.490}{  0.028}    

=> \tau = 17.5 \ s    

4 0
3 years ago
Which example provides the most complete description of an object's motion?
cupoosta [38]

Answer:

The hiker followed a road heading north for 2 miles in 30 minutes.

Explanation:

In order to describe the motion of an object, distance covered and time taken must be required. The total path covered by an object is called the distance travelled.

The hiker followed a road heading north for 2 miles in 30 minutes. This describes the motion of hiker. The motion shows how fast the hiker is moving.  

Distance, d = 2 miles = 3218.6 m

times, t = 30 minutes = 1800 seconds

So, we can say that the hiker is moving with a speed of 1.78 m/s in north direction.

Hence, this is the required solution.

5 0
3 years ago
Read 2 more answers
Other questions:
  • The wave speed in a guitar string of length 57.5 cm is 266 m/s. you pluck the center of the string by pulling it up and letting
    14·1 answer
  • How do you spell hard water in three letters.
    8·2 answers
  • A child standing on the edge of a freely spinning merry-go-round moves quickly to the center. Which one of the following stateme
    10·1 answer
  • Which expressions correctly represent variations of Ohm's law? Check all that apply.
    7·1 answer
  • A people-moving conveyor-belt moves a 600-newton person a distance of 100 meters through the airport.
    10·1 answer
  • The only force acting on a 3.4 kg canister that is moving in an xy plane has a magnitude of 3.0 N. The canister initially has a
    8·1 answer
  • A car travelled a distance of 200 m with initial velocity of 216 km/hr. Calculate the acceleration
    7·1 answer
  • A person of weight mg, is standing on a scale in an elevator. What will the
    5·1 answer
  • Layer T contains a well-known index fossil that is 120 million years old. Layer R contains a different index fossil that is 100
    14·1 answer
  • True or False: When looking at kinetic vs. thermodynamic products the kinetic product predominates at low temperature.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!