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
In-s [12.5K]
4 years ago
5

which scenario involves the most work? a.pulling a box with a force of 127 newtons across the floor for 8 meters b.holding a mas

s with a force of 509 newtons in your arms for 150 seconds c.pushing against a brick wall with a force of 20 newtons for 42 seconds d.lifting a rock by exerting an upward force of 500 newtons for 1 meter
Physics
1 answer:
abruzzese [7]4 years ago
6 0
<span>Work can only be said to be done when an applied force results in displacement of the body in the direction of the applied force.

Work can only be said to be done in options a and d

a.pulling a box with a force of 127 newtons across the floor for 8 meters

work = 127 * 8 = 1016J

</span>
<span>d.lifting a rock by exerting an upward force of 500 newtons for 1 meter

Work = 500 N * 1 m = 500 J

Option D has more work.

D</span>
You might be interested in
Please help! I'm not sure what equation or the process to do this question.
lions [1.4K]

Answer:

The momentum is 1.94 kg m/s.

Explanation:

To solve this problem we equate the potential energy of the spring with the kinetic energy of the ball.

The potential energy U of the compressed spring is given by

U = \dfrac{1}{2} kx^2,

where x is the length of compression and k is the spring constant.

And the kinetic energy of the ball is

K.E = \dfrac{1}{2}mv^2.

When the spring is released all of the potential energy of the spring goes into the kinetic energy of the ball; therefore,

\dfrac{1}{2}mv^2 = \dfrac{1}{2}kx^2,

solving for v we get:

v = x \sqrt{\dfrac{k}{m} }.

And since momentum of the ball is p=mv,

p =mx \sqrt{\dfrac{k}{m} }.

Putting in numbers we get:

p =(0.5kg)(0.25m) \sqrt{\dfrac{(120N/m)}{0.5kg} }.

\boxed{p=1.94kg\: m/s}

5 0
3 years ago
The angle of incidence always equals what?
Ratling [72]

Answer:

Angle Of Incidence Formula The angle of incidence is equal to the reflected angle through the law of reflection. The angle of incidence and the angle of reflection is always equal, and they are both on the same plane along with the normal. 2,44,451

Explanation:

that could help you with work.

4 0
3 years ago
Read 2 more answers
in a circuit, where do electric charges go once they have left the voltage source and traveled along the wires?
S_A_V [24]
In an electric circuit, the free electrons are moving around. Since equal charges repel and opposite charges attract, the electrons move from the negatively charged to the positively charged pole of the voltage source.
7 0
3 years ago
Question 1 of 5
liubo4ka [24]

Answer:

D

Explanation:

its mass would be the same

because the mass of an object is constant or its independent of the gravitational force or pull

5 0
3 years ago
Photons are generated by a microwave oven in a kitchen and by an x ray machine at a dentist’s office. which type of photon has t
Ad libitum [116K]

The different types of radiation are defined by the the amount of energy found in the photons. X-Ray photons will have greater frequency than microwaves but microwaves will have greater wavelength.

There are seven regions in the electromagnetic spectrum which in order of lowest to highest frequency are: Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. Wavelength is inversely proportional to frequency, therefore radio waves have the longest wavelength and gamma rays have the shortest. that is why X-Ray machine photons have greater frequency and shorter wavelength while microwave photons have lower frequency but higher wavelength.

Learn more about Wavelength here-

brainly.com/question/12924624

#SPJ4

6 0
2 years ago
Other questions:
  • You are instructed to remove the appendicular skeleton of a cadaver. To accomplish this goal, you would
    9·1 answer
  • a car traveling at 30m/s notices an accident about 65m up the road. The car's brakes are capable of decelerating at a rate of 6.
    5·1 answer
  • At a particular instant, a proton at the origin has velocity &lt; 5e4, -2e4, 0&gt; m/s. You need to calculate the magnetic field
    9·1 answer
  • A uniform rod of mass 1.90 kg and length 2.00 m is capable of rotating about an axis passing through its centre and perpendicula
    6·1 answer
  • If heat is transferred away from a gas, which could happen?
    6·1 answer
  • What ecosystem do killer whales and seals belong to?
    7·1 answer
  • 9. A 5.0 kg block on an inclined plane is acted upon by a horizontal force of 100 N shown in the figure below. The coefficient o
    10·1 answer
  • A man rides up in an elevator at 12 m. He gains 6500 J of gravitational potential energy. what is the man's mass?
    15·1 answer
  • What type of wave is shown below?
    8·1 answer
  • An ion is an atom that has
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!