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2 years ago

A skater starts skating from rest and speeds up to 6m/s^2 in 12 seconds. What is the acceleration of the skater?

Physics

2 answers:

gogolik [260]2 years ago

5 0

Answer:

$0.5 m/s^2$

Explanation:

The acceleration of an object is given by the equation

$a=\frac{v-u}{t}$

where

v is the final velocity of the object

u is the initial velocity

t is the time taken for the velocity to change from u to v

For the skater in this problem we have:

u = 0 (assuming it starts from rest)

v = 6 m/s is the final velocity of the skater

t = 12 s is the time taken

Substituting, we find

$a=\frac{6-0}{12}=0.5 m/s^2$

Thepotemich [5.8K]2 years ago

3 0

Answer:

2m/s^2

Explanation:

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A Labrador retriever breeder needs to determine if three male pups who were born to Sadie, his black Labrador retriever, are the

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Answer: The things we know are:

Sadie, the mother, is a black labrador.

Sam, the possible father, is a yellow labrador.

Discarding things such as a scientific indagation, the breeder could look for traits in the pups.

For example, yellow is recessive against black, so if the pups are yellow, there is probable that the father is Sam, none the less, if the pups are black there is also the possibility where Sam is the father, just in this case the color genes that the pups received are the ones of the mother.

A good starting point is looking at the color, the posture, and things like that.

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2 years ago

How many significant figures are in 0.0069

posledela

Two significant figures, the 6 and the 9

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2 years ago

If a rock is thrown upward on the planet mars with a velocity of 14 m/s, its height (in meters) after t seconds is given by h =

crimeas [40]

<u>Answer:</u>

Velocity of rock after 2 seconds = 6.56 m/s

<u>Explanation:</u>

We have equation of motion , $s= ut+\frac{1}{2} at^2$ , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

Here height of rock in meters, h = $14t-1.86t^2$

Comparing both the equations

We will get initial velocity = 14 m/s(already given) and $\frac{1}{2} a = -1.86$

So, Acceleration, a = -3.72 $m/s^2$

Now we have equation of motion, v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time taken.

When time is 2 seconds we need to find final velocity.

v = 14 - 3.72 * 2 = 6.56 m/s.

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2 years ago

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VARVARA [1.3K]

Answer: yes.

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It depends on 3 factors:

1. The temperature

2. The specific heat capacity of the metal

3. The thermal conductivity of the metal.

The metal getting warmer also depend on the reflection and the absorption of light energy in which it will surely absorb some energy and not reflect all.

When visible light is absorbed by an object, the object converts the short wavelength light into long wavelength heat. This causes the object to get warmer.

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2 years ago

An electric drill transfers 200 J of energy into a useful kinetic energy store. It also transfers 44 J of energy by sound and 48

kramer

Answer:

Er = 108 [J]

Explanation:

To solve this problem we must understand that the total energy is 200 [J]. Of this energy 44 [J] are lost in sound and 48 [J] are lost in heat. In such a way that these energy values must be subtracted from the total of the kinetic energy.

200 - 44 - 48 = Er

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2 years ago