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4 years ago

12

Which type of energy is the greatest at the bottom of a roller coaster hill? A) Potential Energy B) Thermal Energy Eliminate C)

Sounds Energy D) Kinetic Energy

1 answer:

Oksanka [162]4 years ago

5 0

Your answer would be D) Kinetic energy. Since kinetic energy is at 100% once it reaches the bottom.

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.2, A car starting from rest has an acceleration of

riadik2000 [5.3K]

Answer: 2.5 m/s and 6.25 m

Explanation:

u = 0

a = 0.5 m/s²

t = 5 s

v = u + at

= 0 + 0.5 × 5

= <u>2.5 m/s</u>

s = ut + 1/2 at²

= 1/2 × 2.5 × 5

=<u> 6.25 m</u>

7 0

4 years ago

A plane takes off from an airport and flies to town A, located d1 = 335 km from the airport in the direction 20.0° north of east

gtnhenbr [62]

Answer:

R = 545.38 m ; θ = 28.43°

Explanation:

given,

for town A : d₁ = 335 km at an direction of 20° north of east

for town B : d₂ = 245 km at 30.0° west of north from town A

x = 335 cos 20° + 245 sin 30°

x = 437.29 m

y = 335 sin 20° + 245 cos 30°

y = 326.75 m

$resultant = \sqrt{x^2+y^2}$

$R =\sqrt{437.29^2+326.75^2}$

R = 545.38 m

$tan \theta = \dfrac{326.75}{437.29}$

θ = 28.43°

4 0

4 years ago

A uniform 4.4 t magnetic field points north. if an electron moves vertically downward (toward the ground) with a speed of 2.5 ×

Reil [10]

Answer:

$1.8\cdot 10^{-11} N$

Explanation:

The force acting on the electron due to the magnetic field is

$F=qvB sin \theta$

where

$q=1.6\cdot 10^{-19} C$ is the charge of the electron

$v=2.5\cdot 10^7 m/s$ is its speed

$B=4.4 T$ is the intensity of the magnetic field

$\theta=90^{\circ}$ is the angle between the direction of the field and the velocity of the electron

Substituting all the numbers into the equation, we find

$F=(1.6\cdot 10^{-19}C)(2.5\cdot 10^7 m/s)(4.4 T) sin 90^{\circ}=1.8\cdot 10^{-11} N$

8 0

4 years ago

A force of constant magnitude F and fixed direction acts on an object of mass m that is initially at rest. If the force acts for

ZanzabumX [31]

Answer:

$\Delta P = F \Delta t$

Explanation:

As we know Newton's II law

$F$ = Rate of change in momentum

so we will have

$F = \frac{\Delta P}{\Delta t}$

now we will have

$\Delta P = F \Delta t$

so here we can say that change in momentum of the object is the product of force and interval of time for which the force is acting on it.

so we will have

$\Delta P = F \Delta t$

5 0

3 years ago

Two charges repel each other with a force. If the magnitude of both charges double, but the distance between them remains consta

-Dominant- [34]

Answer:

C.

Explanation:

4 0

3 years ago