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]
3 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]3 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
You drop your frozen rock from a green bridge. The frozen rock starts from rest (initial velocity = 0ms). The rock takes 4.3s to
valentinak56 [21]

Answer:

The velocity of the frozen rock at t = 1.5\,s is -14.711 meters per second.

Explanation:

The frozen rock experiments a free fall, which is a type of uniform accelerated motion due to gravity and air viscosity and earth's rotation effect are neglected. In this case, we need to find the final velocity (v), measured in meters per second, of the frozen rock at given instant and whose kinematic formula is:

v = v_{o} + g\cdot t (Eq. 1)

Where:

v_{o} - Initial velocity, measured in meters per second.

g - Gravity acceleration, measured in meters per square second.

t - Time, measured in seconds.

If we get that v_{o} = 0\,\frac{m}{s}, g = -9.807\,\frac{m}{s^{2}} and 1.5\,s, then final velocity is:

v = 0\,\frac{m}{s}+\left(-9.807\,\frac{m}{s^{2}} \right) \cdot (1.5\,s)

v = -14.711\,\frac{m}{s}

The velocity of the frozen rock at t = 1.5\,s is -14.711 meters per second.

5 0
3 years ago
A car company wants to ensure its newest model can stop in less than 450 ft when traveling at 60 mph. If we assume constant dece
seraphim [82]

Answer:

The value of acceleration that accomplishes this is 8.61 ft/s² .

Explanation:

Given;

maximum distance to be traveled by the car when the brake is applied, d = 450 ft

initial velocity of the car, u = 60 mph = (1.467 x 60) = 88.02 ft/s

final velocity of the car when it stops, v = 0

Apply the following kinematic equation to solve for the deceleration of the car.

v² = u² + 2as

0 = 88.02² + (2 x 450)a

-900a = 7747.5204

a = -7747.5204 / 900

a = -8.61 ft/s²

|a| = 8.61 ft/s²

Therefore, the value of acceleration that accomplishes this is 8.61 ft/s² .

4 0
2 years ago
Will mark as brainliest if correct!!!!!
irakobra [83]

Refraction refers to C. the bending of light rays when they pass from one medium into another

Explanation:

Refraction is a phenomenon typical of wave. Refraction occurs when a wave travels through the boundary between two different mediums. When this occurs, the wave changes speed, wavelength and direction (but the frequency remains the same).

In particular, the direction of the refracted ray is determined by Snell's Law:

n_1 sin \theta_1 = n_2 sin \theta_2

where

n_1 is the index of refraction of the 1st medium

n_2 is the index of refraction of the 2nd medium

\theta_1 is the angle of incidence, which is the angle between the direction of the incident wave and the normal to the boundary

\theta_2 is the angle of refraction, which is the angle between the direction of the refracted wave and the normal to the boundary

Therefore, the correct description of refraction is

C. the bending of light rays when they pass from one medium into another

Learn more about refraction:

brainly.com/question/3183125

brainly.com/question/12370040

#LearnwithBrainly

8 0
3 years ago
What is an Atwood Machine?
Lady_Fox [76]
The best answer is letter (A) a double pulley system. Atwood Machine is normally used as a measurement in balancing to object to verify the mechanical law of motion with constant acceleration.
6 0
3 years ago
A student conducts an experimenting to test how the temperature of a ball affects its bounce height. The same ball is used for e
uysha [10]

the independent variable is what you're testing or changing in an experiment, so the answer is the temperature of the ball when its dropped.

i hope that helped <3

3 0
2 years ago
Read 2 more answers
Other questions:
  • Two forces a 60 newton force east and an 80 newton force north
    9·1 answer
  • Whenever possible, these types of power plants should be built because they generate virtually no pollution. (2 points)
    13·1 answer
  • Which physical property causes you to lean to one side when the bus you are traveling in takes a sharp turn?
    10·1 answer
  • Large group of asteroids that orbit the sun between Mars and jupiter
    13·2 answers
  • A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.79
    10·1 answer
  • Some cities now implement signal lights designed to specifically apply to _____ rather than motorized vehicles.
    6·1 answer
  • Frequency, period and wavelength<br> 11th grade high school physics
    14·1 answer
  • If the amplitude of a sound wave is increased by a factor of four,how does the energy carry by the sound wave in each time inter
    11·1 answer
  • Qliestion 5 (1 point)
    7·1 answer
  • A converging lens with a focal length of 4.0 cm is to the left of a second identical lens. When a feather is placed 12 cm to the
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!