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3 years ago

15

Why does deceleration lower force during a collision?

1 answer:

qwelly [4]3 years ago

3 0

The force depends on the change of momentum. After a deceleration the momentum is less, so the change of momentum is less, so the force is less.

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It has been theorized that all of the modern continents on Earth were once part of a single continent. What scientific evidence

HACTEHA [7]

Answer:

B

Explanation:

It is not just one of these answers, in fact they all make sense. But the one I learned in school was that when the continents were still one super continent- Pangea, animals fossilized wear the borders of modern day continents were. This later on scientists found half of an animal fossil on the edge of one continent and the other half on the edge of a different continent.

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4 0

4 years ago

Read 2 more answers

What is the climate of northern Alaska?

sasho [114]

Answer:

It's short, cool summers (where snow could be year round) and long cold winters.

5 0

4 years ago

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If the momentum of a 1000 kg car travelling at 10 m/s was transferred completely to a 20.0 kg traffic barrier, what would the fi

denis-greek [22]

Answer:

d. 500 m/s

Explanation:

Momentum: This is the product of the mass of a body to its velocity, The S.I unit of momentum is kgm/s.

Mathematically, momentum can be expressed as,

M = mv....................... equation 1

Where M = momentum, m = mass, v = velocity

deduced from the question,

Momentum of the car = momentum of the barrier.

MV = mv ............................. Equation 1

Where M = mass of the car, V = velocity of the car, m = mass of the barrier, v = velocity of the barrier.

making v the subject of the equation,

v = MV/m........................ Equation 2

Given: M = 1000 kg, V = 10 m/s, m = 20 kg.

Substitute into equation 2

v = 1000(10)/20

v = 500 m/s.

Hence the speed of the barrier = 500 m/s

The right option is d. 500 m/s

8 0

4 years ago

True or false, not all substances are soluble in water.

lions [1.4K]

Answer:

A.true

Explanation:

7 0

3 years ago

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A boy whirls a ball on a string in a horizontal circle of radius 1 m. How many revolutions per minute must the ball make if its

spayn [35]

Answer:

Nearest, the revolutions per minute will be 29.

Explanation:

Given that,

Radius of circle = 1 m

Acceleration a =g

We know that,

Angular frequency is defined as,

$\omega=2\pi n$

Where, n = number of revolutions in one second

We need to calculate the revolutions in one second

Using formula of centripetal acceleration

$a=\omega^2r$

Put the value of a and ω

$g=(2\pi n)^2r$

$n=\sqrt{\dfrac{g}{r}}\times\dfrac{1}{2\pi}$

Put the value into the formula

$n=\sqrt{\dfrac{9.8}{1}}\times\dfrac{1}{2\pi}$

$n=0.49$

We need to calculate the revolutions per minute

Using value for the revolutions per minute

$n=0.49\times60$

$n=29.4$

Hence, Nearest, the revolutions per minute will be 29.

7 0

3 years ago