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Oduvanchick [21]
3 years ago
7

Brainliest!!! We observe that it takes 5,3 seconds to cross the distance of 35

Physics
1 answer:
Umnica [9.8K]3 years ago
7 0

Answer:

A) speed = distance / time

               =  35 / 5.3

               = 6.6 = <u>7 m/s</u>

<u></u>

b) 7 m/s = 25.2 km/h = 25 km/h

    speed = distance / time

     time = distance / speed

              = 1000 / 25

              = 4 hrs = <u>240 min </u>

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A car travels around a level, circular track that is 750m across. What coefficient of friction is required to ensure the car can
Crank

The coefficient of friction must be 0.196

Explanation:

For a car moving on a circular track, the frictional force provides the centripetal force needed to keep the car in circular motion. Therefore, we can write:

\mu mg = m\frac{v^2}{r}

where the term on the left is the frictional force acting between the tires of the car and the road, while the term on the right is the centripetal force. The various terms are:

\mu is the coefficient of friction between the tires and the road

m is the mass of the car

g=9.8 m/s^2 is the acceleration of gravity

v is the speed of the car

r is the radius of the curve

In this problem,

r = 750 m is the radius

v=85 mph \cdot \frac{1609}{3600}=38.0 m/s is the speed

And solving for \mu, we find the coefficient of friction required to keep the car in circular motion:

\mu = \frac{v^2}{rg}=\frac{38.0^2}{(750)(9.8)}=0.196

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8 0
3 years ago
The force between two point-charges of 0.040 C and 0.060 C separated by certain distance is 2.2 x 10^5 N. what is the distance b
Gala2k [10]

Answer:

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it is c

Explanation:

8 0
3 years ago
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When a bat strikes a ball, the force exerted can send the ball deep into the outfield. Where is the equal and opposite force in
Delvig [45]

Answer:

The answer is option B:  the ball´s force on the bat

Explanation:

Using Newton's third law (action and reaction) that says: If two bodies interact the force of one exerts on the other is of equal magnitude, direction and opposite direction

Therefore, if the bat hits the ball (action), the ball (reaction) with a force on the bat of equal magnitude, but opposite direction

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3 years ago
I NEED HELP??!!
user100 [1]

The material that transmits most light is d) clear glass.

Explanation:

Depending on whether objects can transmit light or not, they can be classified into three types:

  • Opaque: an object opaque does not transmit light at all (light cannot pass through an opaque object). Examples of opaque objects are metals
  • Translucent: translucent objects allow light to pass partially through them. Examples of translucent objects are fluids
  • Transparent: transparent objects allow light to pass through them. An example of transparent objects is clear glass

In this problem, we have the following objects:

  • Umbrella: it is opaque, light does not pass through it
  • Blanket: it is opaque, light does not pass through it
  • Mirror: It is opaque, since it reflects light (light does not pass through it)
  • Clear glass: it is a transparent object

Therefore, the material that transmits most light is d) clear glass.

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3 years ago
9. Which describes the two parts of a measurement?
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A measurement has two parts: a value and a unit. a fixed amount of something, like a centimeter (CM) of distance.
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