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
sdas [7]
3 years ago
11

A man of weight Wman is standing on the second floor and is pulling on a rope to lift a box of weight Wbox from the floor below.

The rope, which is of negligible weight, has tension T in it, but the pull of the rope is insufficient to lift the box off the floor. What is the magnitude of the normal force that the second floor exerts on the man in this situation?
Physics
1 answer:
slavikrds [6]3 years ago
3 0

Answer:

Explanation:

See the attached figure . See the forces acting on man pulling up the box .

Man is stationary so net force acting on man is zero .

T + R = Wman

R is the reaction force of the ground of second floor  .

R = Wman - T

You might be interested in
Help please due by 3:00
FrozenT [24]

Answer:

  zero

Explanation:

Acceleration is a measure of the rate of change of velocity. If the velocity is unchanging, its rate of change is zero.

The acceleration is zero.

8 0
3 years ago
An object at rest does not _____ and an object in motion does not _____, unless an _____ force acts upon it
mel-nik [20]

Answer:

An object at rest does not move and an object in motion does not change its velocity, unless an external force acts upon it

Explanation:

This statement is also known as Newton's first law, or law of  inertia.

It states that the state of motion of an object can be changed only if there is an external force (different from zero) acting on it: therefore

- If an object is at rest, it will remain at rest if there is no force acting on it

- If an object is moving, it will continue moving at constant velocity if there is no force acting on it

This phenomenon can be also understood by looking at Newton's second law:

F = ma

where

F is the net force on an object

m is the mass

a is the acceleration

If the net force is zero, F = 0, the acceleration of the object is also zero, a = 0: therefore, the velocity of the object does not change, and it will continue moving at the same velocity (which can be zero, if the object was at rest).

5 0
3 years ago
Which of the following statements are correct? 1. Electrons and protons have identical masses but opposite charges. 2. Most of a
lisabon 2012 [21]

Answer:

b 2 only

Explanation:

The mass of an electron is 9.10938356 × 10⁻³¹ kilograms while the mass of a proton is 1.6726219 × 10⁻²⁷ kilograms. It can be seen that a proton is heavier than an electron.

Atoms do not always have the same number of neutrons and protons. For, example ¹³C has 6 protons and 7 neutrons.

Atoms do have most of the mass concentrated at the center called the nucleus. The nucleus has protons and neutrons. As protons have positive charge and neutrons have no charge the nucleus has a positive charge.

7 0
2 years ago
sla’s change in velocity is 30 m/s, and Hazel has the same change in velocity. Which best explains why they would have different
sweet [91]
Because acceleration depends not only on the change in velocity.
It also depends on the time during which the change occurs.
The formula is

Acceleration = (change in velocity) divided by (time for the change) .

Maybe Sla changed his velocity in 3 seconds, but Hazel
took all morning to change hers.  In that case, even though
the amounts of change were equal, the times were different,
so the quotients of (change/time) were different. 
8 0
3 years ago
If Sherry took her pulse for 6 seconds and felt 14 beats, What would her heart rate be?
Schach [20]

Answer:

140 beats per minute

Explanation:

There are 60 seconds in a minute and we know that Sherry felt 14 beats in 6 seconds if you multiply 6 by 10 you get 60 seconds which can be 1 minute. Then you multiply 14 by 10 since you 14 by 10 since you multiplied 6 by 10 and you get 140 beats per minute.

5 0
2 years ago
Other questions:
  • A very slow motion of earth's axis that requires 26,000 years to complete is called ________.
    14·1 answer
  • okay i was trying to see if yall know this okay a wave is a repeating disturbance of movement that transfers .........blank
    5·1 answer
  • On takeoff, the combined action of the engines and wings of an airplane exerts a(n) 7934 N force on the plane, directed upward a
    11·1 answer
  • Calculate the average linear momentum of a particle described by the following wavefunctions: (a) eikx, (b) cos kx, (c) e−ax2 ,
    13·1 answer
  • Jenna can run 9 km in 1 hour. If she runs at that speed for 30 minutes, how far will she go? *
    8·1 answer
  • Which muscle group works the hardest (isometrically) when performing a wrist curl in the pronated position?
    8·2 answers
  • Indigenous people sometimes cooked in watertight baskets by placing enough hot rocks into the water to bring it to a boil. What
    7·1 answer
  • Your spaceship has just crashed on the moon. You were scheduled to rendezvous with a mother ship 200 miles away on the lighted s
    11·1 answer
  • Betty is sitting on of her surfboard out in the ocean. She is waiting for the perfect wave to come along so she can ride in it t
    8·1 answer
  • A force of 10N acts on a car for 3 seconds. The impulse imparted on the car is
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!