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3 years ago

Which forces always push in the opposite direction of motion slow stuff down.

2 answers:

8 0

Friction- the external force that acts on objects and causes them to slow down when no other external force acts upon them.

ella [17]3 years ago

8 0

The force that always pushes in the opposite direction of morion is friction.

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A bucket that has a mass of 20 kg when filled with sand needs to be lifted to the top of a 15 meter tall building. You have a ro

prohojiy [21]

Answer:

work done lifting the bucket (sand and rope) to the top of the building,

W=67.46 Nm

Explanation:

in this question we have given

mass of bucket=20kg

mass of rope= $.2\frac{kg}{m}$

height of building= 15 meter

We have to find the work done lifting the bucket (sand and rope) to the building =work done in lifting the rope + work done in lifting the sand

work done in lifting the rope is given as, $W_{1}=Force \times displacement$

= $\int\limits^{15}_0 {.2x} \, dx$ ..............(1)

= $.1\times 15^2$

=22.5 Nm

work done in lifting the sand is given as, $W_{2}=Force \times displacement$

$W_{2}=\int\limits^{15}_0 F \, dx$ .................(2)

Here,

F=mx+c

here,

c=20-18

c=2

m= $\frac{20-18}{15-0}$

m=.133

Therefore,

$F=.133x+2$

Put value of F in equation 2

$W_{2}=\int\limits^{15}_0 (.133x+2) \, dx$

$W_{2}=.133 \times 112.5+2\times15\\W_{2}=14.96+30\\W_{2}=44.96 Nm$

Therefore,

work done lifting the bucket (sand and rope) to the top of the building, $W=W_{1}+W_{2}$

W=22.5 Nm+44.96 Nm

W=67.46 Nm

4 0

3 years ago

A car traveling at 50 m/s comes to a stop in 5 seconds. What is the<br> acceleration of this car?

Alexandra [31]

Answer:10

Explanation:

You have to do speed divided by time so your answers 10

4 0

2 years ago

Warm water is generally less dense than cold water. The mass of a ship increases as it is loaded with cargo. If a ship will be s

KengaRu [80]

If a ship will be sailing through warm and cold water, people think about making it less dense than the warmest water as they load the ship with cargo. I think you forgot to give the options along with the question. I hope that this is the answer that has actually come to your desired help.

6 0

3 years ago

Read 2 more answers

Friction is defined as *

den301095 [7]

Answer:

O a force that opposes motion

5 0

3 years ago

A 600‑kg car accelerates at a rate of 3 m/s2. How much net force is acting on the car to cause this acceleration?

finlep [7]

600(kg) x 3(m/s^2) = 1800N (newtons)

4 0

3 years ago