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vova2212 [387]
2 years ago
8

A skateboarder traveling at 7.0 meters per second rolls to a stop at the top of a ramp in 3.0 seconds. What is the skateboarder’

s acceleration?
*Please only answer if you know - and ABSOLUTLEY NOOOOOOOO LINKS*
Thank you! :)
Physics
1 answer:
ki77a [65]2 years ago
8 0

Answer:

-2.33 m/s²

Explanation:

The computation of the skateboarder’s acceleration is shown below;

Acceleration means the change in velocity per unit with respect to time.

In the given case, the initial velocity is 7 m/s.

As in the question it is mentioned that  it comes to a stop, so the final velocity would be zero.

And, The time elapsed is 3 seconds.

Now the following equation should be used  

a = (v,final - v,initial) ÷ t

=  (0 - 7)/3

= -2.33 m/s²

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xxMikexx [17]

Let's use Newton's 2nd law of motion:

                                     Force = (mass) x (acceleration)

                                     Force = (68 kg) x (1.2 m/s²) =  81.6 newtons .

8 0
2 years ago
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8. (Liquids, Gas) have no definite shape, and no definite volume.<br> A)Liquid<br> B)Gas
Fynjy0 [20]
B. gas has no definite shape or volume. liquid has definite volume but no definite shape
4 0
2 years ago
Obtain the formula for the focal length of a lens in terms of object distance (u)
Alexxx [7]

Answer:

m=image distance÷object distance

6 0
1 year ago
In which of these situations, is mechanical energy being conserved? (Neglect, air resistance, friction, and breaking) Check all
Amiraneli [1.4K]

1) Mechanical energy is conserved in all the situations mentioned

2) True

3) Potential energy

4) The potential energy is 490 J

5) The potential energy is 750,000 J

Explanation:

1)

The mechanical energy of an object is the sum of its potential energy (PE) and its kinetic energy (KE):

E=PE+KE

When there are no conservative forces acting on the object (i.e. air resistance of friction), the mechanical energy is always conserved, so it is constant:

E=const.

This means that there is a continuous conversion between potential energy and kinetic energy.

In all the examples mentioned here, there are no air resistance or friction acting on the system: therefore, mechanical energy is conserved in all cases.

2)

The potential energy of the object falling to the ground is given by

PE=mgh

where

m is the mass

g is the acceleration of gravity

h is the height of the object above the ground

While the kinetic energy is given by

KE=\frac{1}{2}mv^2

where

v is the speed of the object

As the object falls, its height h decreases, while the speed v increases: therefore, the potential energy decreases and it is converted into kinetinc energy, which increases.

3)

The energy possessed by an object due to its position is called potential energy. It can be of two types:

- Gravitational potential energy: it is the energy possessed by an object due to its position in a gravitational field. It is given by

PE=mgh

where m is the mass, g the acceleration due to gravity, h the height of the object

- Elastic potential energy: it is the energy stored in an elastic object which is compressed or stretched - it is given by

PE=\frac{1}{2}kx^2

where k is the spring constant and x the elongation of the object relative to its equilibrium position.

4)

The (gravitational) potential energy stored in the block is calculated  as

PE=mgh

where:

m = 10 kg is the mass of the block

g=9.8 m/s^2 is the acceleration due to gravity on Earth's surface

h = 5  m is the height of the object above the ground

Substituting, we find the potential energy:

PE=(10)(9.8)(5)=490 J

5)

The potential energy of the elevator is given by

PE=mgh

In this case, we have

h = 500 m (height of the elevator)

W = 1500 N (weight of the elevator)

We also know that the weight is the product of mass and acceleration due to gravity:

W=mg

So we can rewrite the first equation as

PE=Wh

And substituting, we find

PE=(1500)(500)=750,000 J

Learn more about potential energy:

brainly.com/question/1198647

brainly.com/question/10770261

#LearnwithBrainly

5 0
3 years ago
15. Two like charges: A. Attract each other B. Repel each other C. Must be neutrons D. Neutralize each other
seropon [69]

Answer:

B. Repel each other

Explanation:

Two like charges have the same sign. Example an electron with a negative charge (-e) and another electron with same charge(-e). Or a proton with a positive charge (+e) and another proton with same charge (+e). Since each of  these pair charges have the same sign, they will repel each other.

On the other hand, if the charges are opposite, ie  negative charge and positive charge, they will attract each other.

B. Repel each other

7 0
3 years ago
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