If a chlorine atom gains or loses a valence electron, it becomes a charged

Field lines point straight out from all sides of an object

Murljashka [212]

If field lines point

straight out from all sides of an object, then the statement that best

describes the object is that it is a south magnetic pole. The magnetic field lines have the same direction with the compass points.

5 0

3 years ago

20. Which of the following situations is reaction time exhibited?

sashaice [31]

Jenny and Tina play jumping rope,Ben and Ted plays soccer and football and Bovet and Cris perform aerobic exercises are the following situations is reaction time exhibited. Option A,B and D are correct.

<h3>What is reaction time?</h3>

The reaction time of an organism is a measurement of how quickly it responds to a stimulus.

The time interval between the presentation of the stimulus and the manifestation of a suitable voluntary response in the subject is defined as RT.

In the following situations is reaction time exhibited is;

A. Jenny and Tina play jumping rope.

B. Ben and Ted play soccer and football .

D. Bovet and Cris perform aerobic exercises.

Hence,option A,B and D are correct.

To learn more about reaction time refer:

brainly.com/question/13693578

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4 0

2 years ago

How high can a roller coaster be? A roller coaster car is to roll down a frictionless ramp into a loop of a radius r. If the rid

gizmo_the_mogwai [7]

Answer:

h=4r

Explanation:

To solve the problem it is necessary to apply the energy conservation equations for the roller coaster.

The energy conservation equations warn that:

$\Delta KE = \Delta PE$

Where,

$\Delta KE = \frac{1}{2} mv^2 \rightarrow$ Kinetic Energy

$\Delta PE = mgh \rightarrow$ Potential Energy

Equating,

$\frac{1}{2}mv^2 = mgh$

Re-arrange for V,

$V^2 = 2gh$

For balance of forces, according to the announcement, those who are on a roller coaster can withstand up to a maximum of 9g.

Therefore, considering the centripede speed and the speed of the fall, we obtain that,

$F_w+F_a = F_t$

$mg+ma = 9mg$

The centripetal acceleration is given by the equation

$a = \frac{V^2}{r}$

Where

V = Tangencial velocity

r = Radius

Then replacing in the equation of Force,

$mg + m\frac{V^2}{r} = 9mg$

$mg + m \frac{(2gh)}{r} = 9mg$

$1+\frac{2h}{r} = 9$

$h= \frac{8r}{2}$

$h= 4r$

Therefore the maximum height of the incline if the cars starts from the rest is 4 times the raidus of the inclination

5 0

3 years ago

What is an “equilibrium temperature”?

RSB [31]

Answer:

One may assume that the planet radiates energy like a blackbody at some temperature according to the Stefan–Boltzmann law. Thermal equilibrium exists when the power supplied by the star is equal to the power emitted by the planet. The temperature at which this balance occurs is the planetary equilibrium temperature.

Explanation:

6 0

3 years ago

A 30.0 kg wheel, essentially a thin hoop with radius 0.620 m, is rotating at 202 rev/min. It must be brought to a stop in 26.0 s

elena-s [515]

Answer:

(a) 2579.99 J.

(b) 99.23 W

Explanation:

(a)

The work done by the wheel = Kinetic energy of the wheel.

W = 1/2mv².................. Equation 1

Where W = work done, m = mass of the wheel, v = velocity of the wheel.

But,

v = rω..................... Equation 2

Where r = radius of the wheel, ω = angular velocity

Substitute equation 2 into equation 1

W = 1/2mr²ω²................. Equation 3

Given: m = 30 kg, r = 0.620 m, ω = 202 rev/min = (202×0.10472) rad/s = 21.153 rad/s

Substitute into equation 3

W = 1/2(30)(0.62²)(21.153²)

W = 2579.99 J.

(b)

Power = work done/time

P = W/t....................... Equation 4

where P = power, W = work done, t = time

Given: W = 2579.99 J, t = 26 s

Substitute into equation 4

P = 2579.99/26

P = 99.23 W.

5 0

3 years ago