Which requires more work, lifting a 10-kg load a vertical distance of 2 m or lifting a 5-kg load a vertical distance of 4 m?

A woman of mass 50 kg is swimming with a velocity of 1.6 m/s. If she stops stroking and glides to a stop in the water, what is t

Snezhnost [94]

Answer:

Impulse of force = -80 Ns

Explanation:

<u>Given the following data;</u>

Mass = 50kg

Initial velocity = 1.6m/s

Since she glides to a stop, her final velocity equals to zero (0).

Now, we would find the change in velocity.

$Change \; in \; velocity = final \; velocity - initial \; velocity$

Substituting into the equation above;

Change in velocity = 0 - 1.6 = 1.6m/s

$Impulse \; of \; force = mass * change \; in \; velocity$

Substituting into the equation, we have;

$Impulse \; of \; force = 50 * -1.6$

<em>Impulse of force = -80 Ns</em>

<em>Therefore, the impulse of the force that stops her is -80 Newton-seconds and it has a negative value because it is working in an opposite direction, thus, bringing her to a stop. </em>

5 0

2 years ago

Which is the best definition of a parallel

Oksanka [162]

A parallel circuit exists when an electric charge flows in more than one path best describes it.

<h3>What is a Parallel circuit?</h3>

This type of circuit has branches in which the current divides and only part of it flows through any of the branch.

Parallel circuit having more than one branch therefore means that electric charge will flow in more than one path thereby making option A the most appropriate choice.

Read more about Parallel circuit here brainly.com/question/12069231

5 0

2 years ago

What is NOT a raw minteral used in photosyntheisis

Yuliya22 [10]

The photosynthesis equation is :

H2O + CO2 + sunlight (energy) > C6H12O6 + O2

So water (H2O) and carbon dioxide (CO2) are the raw materials need for photosynthesis.

6 0

3 years ago

How does the observed change in the sea floor age support he theory of sea floor spreading

RUDIKE [14]

Dna is the way to answer this questions

6 0

3 years ago

Find the Cartesian components of force PP acting in the x, y, and z directions given P=50.0 NP=50.0 N, α=143.5∘α=143.5∘, β= 70.0

BlackZzzverrR [31]

Answer:

vec(F) = [ -40.193 i + 17.101 j + 24.317 k ]

Explanation:

Given:

-The force P = 50.0 N

- Angle with x-axis α = 143.5

- Angle with y-axis β = 70.0

- Angle with z-axis γ = 60.9

Find:

Find the Cartesian components of force P acting in the x, y, and z directions,

Solution:

- The Force vector in the Cartesian coordinate system is given by the dot product of the Force P and the unit vector in its direction.

F.unit(u) = vec(F)

- Where, the unit vector is defined as:

unit (u) = [ cos(α) i + cos(β) j + cos(γ) k ]

- Using the given unit angles α , β, and γ compute unit (u):

unit (u) = [ cos(143.5) i + cos(70) j + cos(60.9) k ]

unit (u) = [ -0.80386 i + 0.34202 j + 0.48634 k ]

- The force vector is:

vec(F) = 50.[ -0.80386 i + 0.34202 j + 0.48634 k ]

vec(F) = [ -40.193 i + 17.101 j + 24.317 k ]

4 0

3 years ago