Which statement correctly describes force and energy?

Find the distance between the points (2, 8) and (-1, 9).

Shtirlitz [24]

The approximate value for the distance between the two points is 3.162277663.16227766.

√10≈3.16227766

7 0

3 years ago

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Ice floats on water because ice is less dense than water. How is this helpful to fish that live in a lake?. . A.It shades the fi

Phantasy [73]

"It keeps the fish warm in the winter" is the choice among the choices given in the question that shows how it is helpful to fish that lives in a lake water. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer has helped you.

3 0

3 years ago

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(1 point) An object moves along a straight track from the point (−5,4,3)(−5,4,3) to the point (−2,13,−6)(−2,13,−6). The only for

Pavel [41]

Answer:

-15Nm

Explanation:

Work is said to be done when a force causes an object to change its position.

Workdone = Force × Distance

Given the force (−2i+2j+3k)N

Since the body moves from point (−5,4,3) to the point (−2,13,−6), we will take the difference of both points to get the distance covered.

The difference will be final point (-2,13,-6) minus initial point (-5,4,3) i.e (-2,13,-6) - (-5,4,3) = (3,9,-9)

This point can be represented vectorially as (3i+9j-9k)meters

Work done = (−2i+2j+3k)×(3i+9j-9k)

Note that i.i = j.j = k.k = 1, the multiplication of different components will give "zero"

Work done = (-2×3)+(2×9)+(3×-9)

Work done = -6+18-27

Work done= -15Nm

6 0

3 years ago

Two electric motors drive two elevators of equal mass in a three-story building 10 meters tall. Each elevator has a mass of 1,00

wlad13 [49]

Answer:

Power output = $2\times 10^4\ W$

Explanation:

Given:

Mass of the elevator is, $m=1000\ kg$

Height to which it is raised is, $h=10\ m$

Acceleration due to gravity is, $g=10\ m/s^2(Approximately)$

Time taken by the motor to raise the elevator is, $t=5.0\ s$

Now, work done on the elevator by the motor is equal to the increase in the gravitational potential energy of the elevator.

Increase in gravitational potential energy is given as:

$\Delta U=mgh=(1000)(10)(10)=10\times 10^4\ J$

Therefore, work done by motor is, $W=10\times 10^4\ J$

Now, we know that, power is work done in unit time. So, power output is given as:

$Power=\frac{W}{t}\\\\Power=\frac{10\times 10^4\ J}{5.0\ s}\\\\Power=2\times 10^4\ J/s\\\\Power=2\times 10^4\ W..........[1 W = 1\ J/s]$

Therefore, the power output of the first motor is $2\times 10^4\ W$

7 0

4 years ago

What type of relationship exists between the altitude and the atmospheric density, and what would the atmospheric density be at

777dan777 [17]

Answer:

So this means an increase in either will decrease the other factor like density is mass per unit volume and it's also difficult to calculate with only altitude of 1,291 kilometers that's given.

Explanation:

4 0

3 years ago