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Veseljchak [2.6K]
3 years ago
8

Help please i really want to pass this quiz

Physics
1 answer:
Lesechka [4]3 years ago
5 0

Answer:

It is positive and smaller in magnitude than the initial acceleration.

Explanation:

We know that acceleration is defined as the change of velocity in a given time.

We see that the time interval is equal to 30 seconds (70 - 40). In this interval we also see that the velocity increases from 245 to 250 (m/s) approximately. Therefore the acceleration is positive.

With respect to the magnitude we can say that it is smaller than at the beginning since the change of velocities is smaller with respect to the change of velocities at the beginning.

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Calculate the average velocity of the cart for each fan speed. Round your answers to the nearest tenth.
serg [7]
<h2>Answer:</h2>

Answers in the explanation

<h2>Explanation:</h2>

The term speed is used to denote distance  traveled divided by time. This can be expressed in a mathematical language as follows:

v=\frac{d}{t} \\ \\ \\ v:speed \\ \\ d:distance \\ \\ t:time

The cart with Low fan speed:

v=\frac{500}{7.4} \\ \\ v=67.5675cm/s \\ \\ Rounding \ to \ the \ nearest \ tenth: \\ \\ \boxed{v=67.6cm/s}

The cart with Medium fan speed:

v=\frac{500}{6.4} \\ \\ v=78.125cm/s \\ \\ Rounding \ to \ the \ nearest \ tenth: \\ \\ \boxed{v=78.1cm/s}

The cart with High fan speed:

v=\frac{500}{5.5} \\ \\ v=90.9090cm/s \\ \\ Rounding \ to \ the \ nearest \ tenth: \\ \\ \boxed{v=90.9cm/s}

6 0
3 years ago
Read 2 more answers
The lower the temperature of the solvent, the faster the solute will dissolve. True False
denis23 [38]

Answer:

false.

Explanation:

Since temperature and kinetic energy of molecules are proportional, the more we increase the temperature of the solvent, the faster the solute will dissolve.

This increase of kinetic energy allows the solvent molecules to more effective break apart the solvent molecules that are held together by intermolecular forces.

4 0
3 years ago
A bulldozer uses a 500 N force to push a load of dirt 16 m to the worksite. How much work
strojnjashka [21]

Explanation:

Force (F) = 500 N

Distance (d) = 16 m

work done (w) =?

We know that

w = F * d

= 500 * 16

= 8000 Joule.

The bulldozer performs 8000 Joule.

Hope it will help you :)❤

4 0
4 years ago
Coulomb's law is expressed mathematically as
nataly862011 [7]
Force between two charges  = 

     ( 1/4πε₀ ) · (Charge #1) · (Charge #2) / (Distance between them)²

  in the direction away from each other.

In other words, if the force is positive, the charges are repelling.
If the force is negative, the charges are attracting.
4 0
3 years ago
A force of 200N acts between two objects at a certain distance apart .the value of the force when the distance is halved is?
statuscvo [17]

Answer:

800N is the answer

Explanation:

hope it helps

6 0
3 years ago
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