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
erma4kov [3.2K]
3 years ago
7

A 3.00 watt electric motor is plugged into an electrical outlet It takes the motor 30 00 seconds to lift a mass of 254.9 g a dis

tance of
10.00 cm. In that time, the motor has used 90.00 J of energy Assuming no energy leaves the system, how much heat has been
added to the system by the end of those 30 seconds?​
Physics
1 answer:
trasher [3.6K]3 years ago
8 0

Answer:

89.75 J

Explanation:

The motor uses 90.00 J of electrical energy.  Any of that energy that isn't used to do work is converted to heat.

The amount of work done is:

W = mgh

W = (0.2549 kg) (9.81 m/s²) (0.1000 m)

W = 0.2501 J

So the heat generated is:

Q = 90.00 J − 0.2501 J

Q = 89.75 J

You might be interested in
How is sunlight different from light produced by a light bulb or by a fluorescent light bulb
Leona [35]
Sunlight emits more energy than artificial light. Sunlight is better and healthier than most artificial lights and helps plants to grow more.
4 0
3 years ago
The position of a particle moving along the x axis is given in centimeters by x=9.75+1.50t³, where t is in seconds. Calculate(a)
OlgaM077 [116]

Answer:

The solution and the graph are in the attached files below

Explanation:

8 0
3 years ago
3. El tambor de una lavadora que gira a 3 000 revoluciones por minuto (rpm) se acelera uniformemente hasta que alcanza las 6 000
cestrela7 [59]

Answer:

d)    α = 1693.5 rad / s² , a = 392.7 m / s² ,   a_total = α √(R² +1) ,

e)   tan θ = a / α

Explanation:

This is an exercise in linear and angular kinematics.

We initialize reduction of all the magnitudes to the SI system

   w₀ = 3000 rev / min (2π rad / 1rev) (1min / 60s) = 314.16 rad / s

   w = 6000 rev / mi = 628.32 rad / s

   θ = 12 rev = 12 rev (2π rad / 1 rev) = 75.398 rad

d) ask for centripetal, tangential and total acceleration.

Let's start by looking for centripetal acceleration, let's use the formula

          w² = w₀² + 2 α θ

          α = (w²- w₀²) / 2θ

we calculate

           α = (628.32²2 - 314.16²) / 2 75.398

           α = 1693.5 rad / s²

the quantity is linear and angular are related

         

the linear or tangential acceleration is

            a =    α  R

where R is the radius of the drum

            a = 1693.5 R

Unfortunately you do not give the radius of the drum for a complete calculation, but suppose it is a washing machine drum R = 20 cm = 0.20 m

           a = 1693.5 0.20

           a = 392.7 m / s²

the total acceleration is

           a_total = √(a² + α²)

           a_total = √ (α² R² + α²)

           a_total = α √(R² +1)

e) The centripetal acceleration is directed towards the center of the movement is radial and its magnitude is constant

Tangential acceleration is tangency to radius and its value varies proportionally radius

the total accelracicon is the result of the vector sum of the two accelerations and their directions given by trigonometry

            tan θ = a / α

the angular velocity increases linearly when with centripetal acceleration

8 0
3 years ago
During an earthquake, where is the greatest motion felt on the surface?
dalvyx [7]
That would be the epicenter. 
5 0
3 years ago
Which statement accurately describes the illustration?
kvv77 [185]
The answer is B. I hope this helps! :)
3 0
3 years ago
Read 2 more answers
Other questions:
  • At very close range, which of these forces is stronger than the gravitational force a.) electric only, b.) magnetic only c.) ele
    9·2 answers
  • This is a device that will convert mechanical, into electrical energy.
    13·2 answers
  • The two waves shown below pass through the same medium in the phases shown and interfere with each other.
    9·2 answers
  • Consider two wires made of copper. They have the same diameter but one of them has three times the length of the other. Choose t
    14·1 answer
  • Is there any change in the pressure of container filled with water when the volumed is increased
    6·1 answer
  • Which compound is an unsaturated hydrocarbon?
    13·2 answers
  • True or False? PLEASE HELP ME​
    5·1 answer
  • A baseball player hits a ball with a bat. At one moment the force exerted by the bat on the ball is 18,000 N. At that same momen
    9·1 answer
  • before dancing on a smooth wooden floor, ballet dancers sometimes sometimes put a sticky powered called rosin on their shoes sol
    9·1 answer
  • An object of mass 'm' is on an inclined plane with an
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!