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
CaHeK987 [17]
3 years ago
15

Person is lifting a 250 N dumbbell. The weight is 30 cm from the pivot point of the elbow. What force must be exerted five from

the elbow to lift the weight? Assume everything is perpendicular.

Physics
1 answer:
qwelly [4]3 years ago
4 0
Refer to the diagram shown below.

The force, F, is applied at 5 cm from the elbow.

For dynamic equilibrium, the sum of moments about the elbow is zero.
Take moments about the elbow.
(5 cm)*(F N) - (30 cm)*(250 N) = 0
F = (30*250)/5 = 1500 N

Answer: 1500 N

You might be interested in
How do you know the earth is rotating on its axis
cupoosta [38]

Answer:

Read below!

Explanation:

You can watch the sun wheel across the sky during the day, and the stars at night. Focus a telescope on any star besides the north star--especially southern stars--and you can watch them drift across your field of view.  

An alternative explanation is that all the stars are painted on (or holes in) some canopy that rotates around the earth. This explanation does not account for the motion of the "wanderers," or planets, as the Greeks called them, or for the path of the moon among the stars.  

As we know the stars are massive bodies of significant and varying distance to the earth, the notion they all swing around us in unison seems highly implausible

4 0
3 years ago
________ is a measure of how many waves pass by in one second.
Sergio [31]
C. Frequency is a measure of how many waves pass by in one second.
4 0
3 years ago
If a roller coaster train has a potential energy of 1,500 J and a kinetic energy of 500 J as it starts to travel downhill, what
DENIUS [597]

Its total mechanical energy is <em>2,000 J</em>.

We don't have enough information to say anything about its heat energy, its chemical energy, or the energy due to any electrical charge it may be carrying or any magnetic field it may have.

6 0
2 years ago
PLS HELP ASAP (no links)
jeyben [28]

Explanation:

Sorry I don't know the answer

7 0
3 years ago
You are working on charge-storage devices for a research center. Your goal is to store as much charge on a given device as possi
zheka24 [161]

Answer:

Part A the answer is the dielectric constant.

Part B  Mica- mylar- paper- quartz

Explanation:

The capacity of a capacitor is given by

           C = ε ε₀ A / d

Where the dielectric constant (ε) is the value of the material between the plates of the capacitor, we see that as if value increases the capacity also increases.

Another magnitude that we must take into account that the maximum working voltage, the greater the safer is the capacitor

the flexibility of the material must also be taken into account

Part A the answer is the dielectric constant.

Pate B order the materials from best to worst

Mica. The best ever

Mylar Flexible

Paper Low capacity, low working voltage, flexible

Quartz high dielectric, but brittle

8 0
3 years ago
Other questions:
  • Determine the specific heat of iron if 6.1 j of energy are needed to warm 1.50 g of iron from 20.0◦c to 29.0◦c?
    7·1 answer
  • How could the position data from a motion sensor be used to create a velocity--time graph?
    8·1 answer
  • A proton initially has V=4.0 i -2.0 j +3.0 k and then 4 seconds later has v= -2.0 i -2.0 j +5.0 k (in meters per second).A) For
    10·1 answer
  • ABO blood group is a classification of blood depending on the presence of 4 different antigens.
    6·2 answers
  • The gear motor can develop to 1/2 hp when it turns at 300 rev/min. If the shaft has a diameter of 1/2 in. determine the maximum
    11·1 answer
  • When astronauts travel to the moon, their bodies experience a lower gravitational pull than on Earth. Which type of pull are the
    5·2 answers
  • why is a person who lives in the city able to sleep through the sounds of traffic but awaken to the soft sound of bird singing
    5·2 answers
  • ¿Es posible determinar el valos de las variables que intervienen en los diferentes movimientos en dos dimensiones?
    6·1 answer
  • If you use the same force to push a motorcycle as you would push a bike which one would have more acceleration and why explain u
    12·2 answers
  • A sports car starts from rest it covers a distance of 900 m to attain a speed of 80m s determine the acceleration of the car and
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!