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3 years ago

what has more momentum, a baseball traveling at 4 m/s or a baseball traveling at 16m/s ? and which has more energy ?

1 answer:

3 0

We know the formulas for momentum and energy. But they both involve the mass of
the object, and we don't know the mass of the baseball. What can we do ?

It's not a catastrophe. The question only asks which one is bigger. If we're clever,
we can answer that without ever knowing how much the momentum or the energy
actually is. We know that both baseballs have the same mass, so let's just call it
' M ' and not worry about what it really is.

Momentum of anything = (mass) x (speed)
Momentum of the first baseball = (M) x (4 m/s) = 4M
Momentum of the second one = (M) x (16 m/s) = 16M
The second baseball has 4 times as much momentum as the first one has.

Kinetic energy of anything = 1/2 (mass) x (speed squared)
KE of the first baseball = 1/2 (M) x (4 squared) = 8M
KE of the second one = 1/2 (M) x (16 squared) = 128M
The second baseball has 16 times as much kinetic energy as the first one has.

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Jobisdone [24]

Answer:

A foot kicking ball.

An iPhone being charged

Explanation:

A foot kicking a ball is example of transportation of Kinetic energy

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An iPhone being charged means the electronic energy is converted into machinery energy

6 0

2 years ago

) Force F = − + ( 8.00 N i 6.00 N j ) ( ) acts on a particle with position vector r = + (3.00 m i 4.00 m j ) ( ) . What are (a)

natali 33 [55]

To develop this problem it is necessary to apply the concepts related to the Cross Product of two vectors as well as to obtain the angle through the magnitude of the angles.

The vector product between the Force and the radius allows us to obtain the torque, in this way,

$\tau = \vec{F} \times \vec{r}$

$\tau = (8i+6j)\times(-3i+4j)$

$\tau = (8*4)(i\times j)+(6*-3)(j\times i)$

$\tau = 32k +18k$

$\tau = 50 k$

Therefore the torque on the particle about the origen is 50k

PART B) To find the angle between two vectors we apply the definition of the dot product based on the vector quantities, that is,

$cos\theta = \frac{r\cdot F}{|\vec{r}|*|\vec{F}|}$

$cos\theta = \frac{(8*-3)+(4*3)}{\sqrt{(-3)^2+4^2}*\sqrt{8^2+6^2}}$

$cos\theta = -0.24$

$\theta = cos^{-1} (-0.24)$

$\theta = 103.88\°$

Therefore the angle between the ratio and the force is 103.88°

5 0

2 years ago

A car with an initial speed of 4.30 m/s accelerates

Ivenika [448]

Heya!!

For calculate final velocity, lets applicate formula

$\boxed{V=V_o+a*t}$

Δ Being Δ

V = Final Velocity = ?

Vo = Initial velocity = 4,3 m/s

a = Aceleration = 3 m/s²

t = Time =5 s

⇒ Let's replace according the formula:

$\boxed{V=4,3\ m/s +3\ m/s* 5\ s}$

⇒ Resolving

$\boxed{V=19,3\ m/s}$

Result:

The velocity after 5 sec is 19,3 meters per second (m/s)

For calculate distance, lets applicate formula

$\boxed{x=V_o*t+\dfrac{a*t^{2}}{2}}}$

Δ Being Δ

x = Distance = ?

Vo = Initial velocity = 4,3 m/s

a = Aceleration = 3 m/s²

t = Time =5 s

⇒ Let's replace according the formula:

$\boxed{x=4,3 * 5 +\dfrac{3*5^{2}}{2}}}$

⇒ Resolving

$\boxed{x = 59 \ m}$

Result:

The distance is 59 meters.

Good Luck!!

3 0

2 years ago

When riding your dirt bike you run into a tree which causes your bike to immediately come to a stop. You fly over the handle bar

Natali5045456 [20]

Newton's first law of motion. Because you fly over the handlebars and you land a few feet away on the ground. Your bike would stop immediately because of the unbalanced force.

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3 years ago

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Psychoanalytic theory originated with

worty [1.4K]

Sigmund Freud. He is also the father of psychoanalysis.

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2 years ago