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3 years ago

A roller coaster car has a mass of 290. kilograms. Starting from rest, the car acquires

1 answer:

4 0

Now I can actually edit my answer directly: I'm fairly sure I've got this wrong, and my mind has gone blank for how to do it, if someone could delete this that would be great and I'll think about it and see if I can figure it out!

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Two bar magnets are hung from metal rods and held in the position shown below.

fiasKO [112]

The correct diagram is C.

In fact, the magnetic force works as the electrostatic force: like poles repel each other, while opposite poles attract each other. In this example, we have two magnets one next to each other, and we see that the north pole of one magnet is close to the south pole of the other: therefore, the two poles attract each other, so the two magnets will move closer, as in diagram C.

5 0

4 years ago

Read 2 more answers

A 19-year old soccer player extends their right knee from an initial angle of 20o to 140o in 2 s. If this movement began from re

Mandarinka [93]

Answer: 32π/9 rad/s²

Explanation: initial angular displacement = 20°, final angular displacement = 140°, average time = 2s.

We need to convert the angular displacements to radian.

Recall that 2π = 360°, hence 20° = (20 × 2π)/360 = π/9 rad

Converting 140° to radian we have that

140° = (140 × 2π)/360 = 7π/9

Initial angular displacement = π/9 rad

Final angular displacement = 7π/9

Average angular velocity = change in angular displacement /time

Average angular velocity = 7π /9 - π/9/2

Average angular velocity = (8π/9)/2

Average angular velocity = 16π/9 rad/s

Average angular acceleration = average angular velocity / time taken

Average angular acceleration = (16π/9)/2

Average angular acceleration = 32π/9 rad/s²

4 0

3 years ago

Letícia leaves the grocery store and walks 150.0 m to the parking lot. Then, she turns 90° to the right and walks an additional

Alexxx [7]

Answer:

165.529454

Explanation:

According to the Pythagorean Theorem for calculating the lengths of a right angle triangle's sides, a^2 + b+2 = c^2, where c is the longest side (and the side opposing the right angle). So in your case it would be 150*150 + 70*70 = 27400. And √ 27400 is your answer.

7 0

3 years ago

a runner makes one lap around a 200m track in 25s, what is the runners (a) average speed and (b) average velocity

TEA [102]

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5 0

3 years ago

Please help I have marked the circles with numbers which one is it anybody knows?

Virty [35]

Answer:

hi sandra!!

Explanation:

the number 3 is the correct!!

The Aurora is an incredible light show caused by collisions between electrically charged particles released from the sun that enter the earth’s atmosphere and collide with gases such as oxygen and nitrogen. The lights are seen around the magnetic poles of the northern and southern hemispheres.

Auroras that occur in the northern hemisphere are called ‘Aurora Borealis’ or ‘northern lights’ and auroras that occur in the southern hemisphere are called ‘Aurora Australis’ or ‘southern lights’.

Auroral displays can appear in many differents colours, but green is the most common. Colours such as red, yellow, green, blue and violet are also seen occasionally. The auroras can appear in many forms, from small patches of light that appear out of nowhere to streamers, arcs, rippling curtains or shooting rays that light up the sky with an incredible glow.

4 0

3 years ago

Read 2 more answers