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
const2013 [10]
3 years ago
14

Two people carry a heavy electric motor by placing it on a light board 1.50 m long. One person lifts at one end with a force of

410 N, and the other lifts the opposite end with a force of 710 N.
a. What is the weight of the motor?
b. Where along with the board is its center of gravity located?
c. Suppose the board is not light but weighs 200, with its center of gravity at its center, and the two people each exert the same forces as before. What is the weight of the motor in this case?
d. Where is its center of gravity located?
Physics
1 answer:
ankoles [38]3 years ago
7 0

Answer:

a) The weight of the motor is 1120 N

b) The distance of the center of gravity is 1.71 m

c) The weight of the motor is 920 N

d) The distance of the center of gravity is 1.79 m

Explanation:

a) The expression of the forces acting in the vertical direction is:

wmotor = F1 + F2

F1 = 410 N

F2 = 710 N

wmotor = 410 + 710 = 1120 N

b) The momentum of equilibrium about the center of the gravity is:

F1 * x = F2 * (l - x)

Clearing x:

x=\frac{2.7*710}{1120} =1.71m

c) The expression for the forces acting in the vertical direction is:

wboard + wmotor = F1 + F2

wmotor = F1 + F2 - wboard

wmotor = 410 + 710 - 200

wmotor = 920 N

d) The same that b)

w_{motor} (\frac{l}{2} )+w_{board} x=F_{2} l\\x=\frac{2.7*710-200\frac{2.7}{2} }{920} =1.79m

You might be interested in
Allen and Jason are chucking a speaker around. On one particular throw, Allen throws the speaker, which is playing a pure tone o
Sholpan [36]

Answer:

Explanation:

We shall apply Doppler's effect of sound .

speaker is the source , Jason is the observer . Source is moving at 10 m /s , observer is moving at  6 m/s .

apparent frequency = f_o\times\frac{V+v_o}{ V-v_s}

V is velocity of sound , v₀ is velocity of observer and v_s is velocity of source and f_o is real frequency of source .

Here V = 340 m/s , v₀ is 6 m/s , v_s is 10 m/s . f_o = f

apparent frequency =  f\times \frac{340+6}{340-10}

= f\times \frac{346}{330}

So m = 346 , n = 330 .

8 0
3 years ago
Almost everything in the universe orbits around a central object. The planets orbit the sun and moons orbit planets. The force M
DanielleElmas [232]
Gravity is why orbits are happening.
3 0
3 years ago
Read 2 more answers
Two spaceships are observed from earth to be approaching each other along a straight line. Ship A moves at 0.40c relative to the
nirvana33 [79]

Answer:

0.80 c

Explanation:

The computation of speed is shown below:-

Here, The speed of the captain ship A report for speed of the ship B which is

S = \frac{S_A + S_B}{1 + \frac{(S_AS_B)}{c^2} }

where

S_A indicates the speed of the ship A

S_B indicates the speed of the ship B

and

C indicates the velocity of life

now we will Substitute 0.40c for A and 0.60 for B in the equation which is

S = \frac{0.40c + 0.60c}{1 + \frac{(0.40c)(0.60c)}{c^2} }

after solving the above equation we will get

0.80 c

So, The correct answer is 0.80c

5 0
3 years ago
During a thunderstorm, a plasma channel forms between the negatively charged clouds and the positively charged Earth, which crea
olchik [2.2K]
Electrons would likely pass through the plasma channel when the formation of a lightning takes place. Lightning is primarily caused by the formation of an ionised cloud in the atmosphere. This cloud was due to the attractions between molecules of rain drops wherein produce a negative charge.
4 0
3 years ago
Read 2 more answers
A cylinder containing the air comprises the systemm. Cycle is completed as follows : (i) 82000 N-m of work is done by the piston
Stella [2.4K]

Answer & Explanation:

1 N-m = 1 Joule

So 82 kJ of energy put into the system during (i).

45 kJ of heat leaves the system, so 82 kJ - 45 kJ  = 37 kJ is remaining.

(ii) requires 100 kJ of energy but only 37 kJ is available, so 100 kJ - 37 kJ = 63 kJ of heat energy must be added to the system.

4 0
3 years ago
Other questions:
  • A “constant” is a parameter that stays the same regardless of the variables. One parameter of the cart that is held constant is
    12·2 answers
  • The potential energy of a catapult was completely converted into kinetic energy by releasing a small stone with a mass of 20 gra
    12·2 answers
  • _____ is the frictional force needed to slow an object in motion
    11·2 answers
  • What is the calculation for elastic potential?
    12·1 answer
  • The bohr model of the atom addressed the problem of
    8·1 answer
  • When point charges q1 = +7.9 μC and q2 = +6.0 μC are brought near each other, each experiences a repulsive force of magnitude 0.
    10·1 answer
  • A force does work on an object if a component of the force is
    11·1 answer
  • A 1.0 kg ball falling vertically hits a floor with a velocity of 3.0 m/s and bounces vertically up with a velocity of 2.0 m/s .
    8·1 answer
  • Complete the table
    14·1 answer
  • Athlete’s foot is also called...
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!