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8090 [49]
3 years ago
13

Toy car goes 2 meters in 3.1 seconds, find the average speed?

Physics
1 answer:
photoshop1234 [79]3 years ago
5 0
Speed =distance over time

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Explain the term "Acceleration due to gravity"
dem82 [27]

Answer:

"Acceleration due to gravity" typically refers to the increase in speed of a falling object due to the gravitational pull of the Earth. If jump out of a plane, your speed increases towards the Earth (or the center of the Earth really) due to the acceleration of gravity. If you throw a ball up in the air, it slows down and falls due to the acceleration of gravity.

I guess it's specified because the force of gravity is causing the acceleration in these instances; as opposed to some other outside force.

3 0
3 years ago
A 41.0-kg child swings in a swing supported by two chains, each 3.04 m long. The tension in each chain at the lowest point is 35
Fantom [35]

Answer:

V = 4.826m/s, 716N

Explanation:

At the lowest swinging point, the net force acting on the child is equal to the centripetal force and it could be represented as

F = mv^2/r

2T-mg =mv^2/r

r(2T-mg) = mv^2

Divide both sides by m

r(2T-mg)/m = mv^2/m

r(2T/m-g) = v^2

V= √ r(2T/m-g)

Where v is the velocity

r is the length of the chain

m is the mass of the child in kg

T is the tension in Newton

g is the acceleration due to gravity

Given that g = 9.8m/s^2

T = 358N

m = 41.0kg

r = 3.04m

Substituting the values into the formula

V = √ 3.04( 2*358/41 -9.89

V = √ 3.04 ( 716/41 - 9.8 )

V = √3.04 ( 17.463-9.8 )

V = √3.04( 7.6634)

V = √23.2967

V = 4.826m/s

For the second part which is the tension in the two chains

N - m*g = m*(v^2 / r)

N - (41)*(9.81) = (41)*(4.826^2 / 3.04)

N - 402.21 = 41×7.66

N - 402.21 = 314.112

N = 402.21 + 314.112

N = 716.332 newton

Approximately = 716N

Or alternatively, since there are two chains holding the swing, of which each chain is acted upon by a 358N tension. Hence = 2T

2*358 = 716N

8 0
3 years ago
Matter's resistance to a change in motion is called
AURORKA [14]

Answer:

Inertia! I hope this helps!

7 0
3 years ago
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A Tesla Roadster car accelerates from rest at a rate of 7.1m/s' for a time of 3.9s.
In-s [12.5K]

Answer:

1.2

Explanation:

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2 Points<br> When must scientific theories be changed?
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Answer:when the two points get added.

Explanation:

8 0
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