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
Oliga [24]
3 years ago
9

To practice Tactics Box 9.1 Calculating the Work Done by a Constant Force. Recall that the work W done by a constant force F⃗ at

an angle θ to the displacement Δr⃗ is W=F⃗ ⋅ Δr⃗ =FΔrcosθ. The vector magnitudes F and Δr are always positive, so the sign of W is determined entirely by the angle θ between the force and the displacement.
Physics
2 answers:
garri49 [273]3 years ago
4 0

Answer:

See espplanation below.

Explanation:

The deduction of the formula given is this one:

We can assume that we have a constant force F acting on a point that follows a curve Y with a velocity v at each instant, we can define an small amount of work d W who occurs on a instant dt and we can calculate it as:

d W= F dr = F v dt

And we have that Fv represent the power at the instant dt and we can sum all the small amounts for the work in the entire trajectory with the following integral:

W =\int_{t_1}^{t_2} F v dt = \int_{t_1}^{t_2} F \frac{dr}{dt} dt =\int_M F ds

And M represent the trajectory from y(t_1) to y(t_2)

If we assume that the force is constant so then we can do this with the integral:

W= \int_M F dr = F \int_M dr = F \Delta r

Where \Delta r represent the displacement of the point along the curve.

We know that the fot product can be expressed on this way:

F \Delta r = f Cos \theta dr

Where \theta represent the angle between the force vector and the direction of the movement, so in general we have this:

W= \int_M F dr = F \Delta r cos \theta

And as we can see F and \Delta r are scalars (assumed constant both) and not affect the sign of the work, so the only value that affect the sign of W is the angle since depedens of the cosine function who is maximum at 0 and 2\pi and minimum at \pi/2

insens350 [35]3 years ago
3 0

Answer:

The vector magnitudes F and r are always postive, so the sign o W is determined entirely by the angle e between the force and the displacement.Submit Figure 1 off 1 part C

You might be interested in
Explain the theory of plate tectonics in your own words
Irina-Kira [14]
The outer rigid layer of the earth is divided into a couple of dozen “plates” that move around across earths surface relative to each other.
7 0
3 years ago
A hiker walks 20.51 m at 33.16 degrees. What is the Y component of his displacement?
Serhud [2]

Answer:

<em>The y component of his displacement is 11.22 meters</em>

Explanation:

<u>Components of the displacement</u>

The displacement is a vector because it has a magnitude and a direction. Let's suppose a displacement has a magnitude r and a direction θ, measured with respect to the positive x-direction. The horizontal component of the displacement is calculated by:

x=r\cos\theta

The vertical component is calculated by:

y=r\sin\theta

The hiker has a displacement with magnitude r = 20.51 m at an angle of 33.16 degrees. Substituting in the above equation:

y=20.51\sin(33.16^\circ)

y=11.22\ m

The y component of his displacement is 11.22 meters

7 0
3 years ago
What is the definition of power ? what are the units of power?​
Jet001 [13]

Answer:

power is the rate at which energy is transferred or converted

the unit of power is Watts

4 0
3 years ago
Describe the interaction with the sun and producers
bagirrra123 [75]

Answer: the sun's rays is one of the raw Materials recquired by plants to make food

Explanation:plants trap light used in splitting water into hydrogen ions and oxygen molecules

4 0
3 years ago
Can some one help me with this question its hard :( down below ill give brainliest
eduard

Answer:  B

Explanation:

8 0
3 years ago
Other questions:
  • The management information base (MIB) is a repository of data maintained at a managing entity site, providing the network manage
    6·1 answer
  • Farmers during the dust bowl of the 1930s watched their soil be carried away by wind what process removed the soil from the plac
    13·2 answers
  • What is the power dissipated by a 50.0 ohm resistor?
    11·1 answer
  • An ice hockey puck slides along the ice at 12 m/s.?
    7·1 answer
  • When measuring the diameter of a cylinder the following measurements are obtained.
    13·1 answer
  • A 1500 kg car rounds a horizontal curve with a radius of 52 m at a speed of 12 m/s. what minimum coefficient of friction must ex
    5·1 answer
  • Claudia stubs her toe on the coffee table with a force of 100.ON. A) What is the
    11·1 answer
  • When a roller coaster is stationary at the top of a hill is has the most potential energy. What does stationary mean in this sen
    14·1 answer
  • I would appreciate your help​
    8·1 answer
  • The amount of straight pipe needed to bend a given radius. Also, the actual length of the conduit that will be bent.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!