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Answer 1

Answer:

Answer:

at rest because time is passing and speed is still at 0

Explanation:

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A drowsy cat spots a flowerpot that sails first up and then down past an open window. The pot is in view for a total of 0.66 s, and the top-to-bottom height of the window is 1.80 m. How high above the window top does the flowerpot go? (Assume that in both sailing upward and then falling downward, the flowerpot is seen to span the full vertical height of the window.)

Answers

Answer:

Height covered after crossing window top = 0.75 m

Explanation:

In the question,

The height of the window pane = 1.8 m

Time for which the flowerpot is in view = 0.66 s

So,

The time for which it was in view while going up is = 0.33 s

Time for which it was in view while going down = 0.33 s

So,

Let us say,

The initial velocity of the flowerpot = u m/s

So,

Using the equation of the motion,

$s=ut+(1)/(2)at^(2)\n1.8=u(0.33)-(1)/(2)(9.8)(0.33)^(2)\n1.8=0.33u-0.5336\n0.33u=2.33\nu=7.07\,m/s$

So,

Velocity at the top of the window pane is given by,

$v=u+at\nv=7.07-(9.8)(0.33)\nv=3.836\,m/s$

Now,

Let us say the height to which the flowerpot goes after crossing the window pane is = h

So,

Using the equation of motion,

$v^(2)-u^(2)=2as\n(0)^(2)-(3.836)^(2)=2(-9.8)h\nh=(14.714)/(19.6)\nh=0.75\,m$

Therefore, the height covered by the flowerpot after window is = 0.75 m

Q14) When you break a bar magnet in half, how many poles does each piece have?

Answers

Each piece of magnet has only two poles, one north and one south. So if you break a bar magnet into two halves, the piece initially consisting the north pole at the edge automatically creates the south pole at the break point and the part consisting south pole creates North pole at the edge. So each piece has 2 poles.

A magnet is an item or substance that generates a magnetic field. The broken pieces of the magnet will have 4 poles.

What are magnets?

A magnet is an item or substance that generates a magnetic field. This magnetic field is invisible, but it is responsible for a magnet's most remarkable property: a force that attracts or repels other ferromagnetic elements such as iron, steel, nickel, cobalt, and others.

When a magnet is broken into two pieces, it produces two complete magnets, each with its own north and south poles and the same orientation as the original.

For example, if you break a 12-inch bar magnet with N on the left end and S on the right end midway between the two ends, you'll get two magnets with N on the left end and S on the right end, as seen in the illustration below.

Hence, the broken pieces of the magnet will have 4 poles.

Learn more about Magnets:

brainly.com/question/19542022

Currently, is our planet an open or closed system?

Answers

Our planet is closed system because there is a limit of how much matter could be exchanged.

At what time of day would you be most likely to find that the air over water is significantly warmer than the air over land nearby?

Answers

This would happen later at night or early in the morning.

The reason being land becomes warm and cold quicker than the water because of the heat capacity. So during the day water warms up because of sunlight but at night the land becomes a lot cooler as compared to the water which is still war. So the air over water is significantly warmer than the air over land.

The answer is 5:00 AM

A particle moves along a straight line with equation of motion s = f(t), where s is measured in meters and t in seconds. find the velocity and speed when t = 6. f(t) = 100 + 60t − 4.5t2

Answers

As the particle moves along a straight line, the magnitude of the velocity is equal to the speed and the direction is along the direction of motion.

To find out the speed of the particle, we have to differentiate the given equation of motion. That is,

Speed = $(d(s))/(dt) \n =(d(100+60t-4.5t^(2)))/(dt) \n =0+60-9t$

For t=6 s, we get

Speed = 60₋ 9 × 6 = 60₋54=6 m/s

The speed of the particle at t=6 s is 6 m/s.

When a compression wave travel through a median, which way does matter in the median move?

Answers

Matter will move upwards or outwards depending on the direction of the compression wave