Ask question

Ask question

All categories

3 years ago

7

13. A set of pulleys lifts an 800 N crate 4 meters in 7 seconds. What power was used?

2 answers:

kiruha [24]3 years ago

8 0

Answer:power=457.1watts

Explanation:

Vlad [161]3 years ago

5 0

Answer:

457.14 Watt

Explanation:

The information we have is:

Force: $F=800N$

Distance: $d=4m$

Time: $t=7s$

the formula for the power is:

$P=\frac{W}{t}$

where $W$ is work, and $t$ si time.

Also, the formula for work is:

$W=F*d$

Where $F$ is the force, and $d$ is the distance.

Substituting the formula for work into the formula for power:

$W=\frac{F*d}{t}$

substituting all the values to find the power:

$P=\frac{(800N)(4m)}{7s}=\frac{3200Nm}{7s}\\ P=457.14W$

the power that was used is 457.14 Watt

You might be interested in

A bowling ball of mass 5.8 kg moves in a straight line at 4.34 m/s How fast must a Ping-Pong ball of mass 2.214 g move in a stra

lilavasa [31]

Answer: 11369.46 m/s

Explanation:

We have the following data:

$m_{1}=5.8 kg$ is the mass of the bowling ball

$V_{1}=4.34 m/s$ is the velocity of the bowling ball

$m_{2}=2.214 g \frac{1 kg}{1000 g}=0.002214 kg$ is the mass of the ping-pong ball

$V_{2}$ is the velocity of the ping-pong ball

Now, the momentum $p_{1}$ of the bowling ball is:

$p_{1}=m_{1}V_{1}$ (1)

$p_{1}=(5.8 kg)(4.34 m/s)$

$p_{1}=25.172 kg m/s$ (2)

And the momentum $p_{2}$ of the ping-pong ball is:

$p_{2}=m_{2}V_{2}$ (3)

If the momentum of the bowling ball is equal to the momentum of the ping-pong ball:

$p_{1}=p_{2}$ (4)

$m_{1}V_{1}=m_{2}V_{2}$ (5)

Isolating $V_{2}$ :

$V_{2}=\frac{m_{1}V_{1}}{m_{2}}$ (6)

$V_{2}=\frac{25.172 kg m/s}{0.002214 kg}$ (7)

Finally:

$V_{2}=11369.46 m/s$

6 0

2 years ago

What is the part of the cell that controls all the other parts?

Harrizon [31]

A nucleus controls all the other parts of the cell

3 0

3 years ago

Which terrestrial ecosystem or life zone produces the highest net primary productivity per year? a. temperate forest b. Savanna

horsena [70]

a. hope this helps...

8 0

3 years ago

Define mechanics and describe its three major divisions

Andrew [12]

<u>Mechanics</u> is the branch of physics which deals with the study of motion of material objects.

<u><em>Divisions</em></u>

There are three major division of mechanics

Statics

Kinematics

Dynamics.

4 0

2 years ago

Compared to the cells in a healthy body, Elisa’s cells are getting far fewer ____________________ molecules.

Elenna [48]

Answer:

glucose

Explanation:

7 0

3 years ago