Simon is riding a bike at 12 km/h away from his friend Keesha.He throws a ball at 5 km/h back to Keesha, who is standing still on a sidewalk.
How fast would Keesha say the ball is traveling toward her?

Answers

Answer 1

Answer:
I notice that even though we're working with frames of reference
here, you never said which frame the '5 km/hr' is measured in.

In fact ! You didn't even say which frame the '12 km/hr' of his
bike is measured in.

So there are several different ways this could go. I'll do it the way
I THINK you meant it, but that doesn't guarantee anything.

-- Simon is riding his bike at 12 km/hr relative to the sidewalk,
away from Keesha.

-- He throws a ball at Keesha, at 5 km/hr relative to his own face.

-- Keesha sees the ball approaching her at (12 - 5) = 7 km/hr
relative to the ground and to her.

Answer 2

Answer:

Answer:

Explanation:

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a stroller is pushed from rest, accelerating at 500m/s. what is the velocity after it has traveled 6.32m?

Answers

The velocity a stroller is pushed from rest, accelerating at 500m/s is 7.5 m/s.

To find the final velocity of the stroller after it has traveled a certain distance while accelerating, one can calculate it using the third equation of motion:

v²-u² = 2as

The third equation of motion is one of the equations used in classical physics to describe the motion of an object with constant acceleration.

Given:

Acceleration, a = 500 m/s²

Distance, s = 6.32 m

The velocity is computed as:

v² - 0² = 2 × 500 × 6.32

v² = 6320

v = 79.5 m/s

Hence, the velocity a stroller is pushed from rest, accelerating at 500m/s is 7.5 m/s.

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The waste products of a nuclear fission powerplant can best be described asa. Small in quantity and not very dangerous.
b. Large in quantity and not very dangerous.
c. Large in quantity and very dangerously radioactive. Eliminate
d. Small in quantity and very dangerously radioactive.

Answers

The answer is D. small in quantity and very dangerously radioactive.

a.

-> the products are stable atoms with a much lower atomic number. For example, Uranium 238 commonly breaks down into strontium and xenon, both of which are stable and non-radioactive.

They are also low in quantity because of the precision involved in breaking down a large atom via neutron capture means that few fission reactions take place.

Hope I helped :)

Source: I studied nuclear physics in year 11

How do similar (S-S or N-N) magnetic poles interact?

Answers

Magnets with the same polarity (N-N or S-S) repel one another along the same direction. This agrees to the common rule that like poles repel and unlike poles attract. Hope this answers the question. Have a nice day. Feel free to ask more questions.

Explanation:

Magnet has two poles: (1) North pole and (2) South pole.

Like poles repel each other. If the like poles are interacting each other then there will be force of repulsion in between these poles.

Unlike poles attract each other. If the unlike poles are interacting each other then there will be force of attraction in between these poles.

S-S and N-N magnetic poles repel each other.

1. A substance which allows visible light to pass through freely is ______. A. opaque B. reflective C. transparent D. translucent2. A substance can be opaque to certain wavelengths of electromagnetic radiation, but transparent to others. A. True B. False
3. _______ is when either the vertical or the horizontal component of light waves is eliminated.

A. Refraction
B. Scattering
C. Transmission
D. Polarization

Answers

1. Transparent
2. True
3. Polarisation

Lightning strikes 16,090 meters away from you.How long does it take the sound of thunder to get to you at 20°C temperature?

with solution and formula<3

Answers

Final answer:

It takes approximately 47 seconds for the sound of thunder to reach you at 20°C temperature.

Explanation:

The time it takes for the sound of thunder to reach you can be determined using the formula:

Time = Distance / Speed

Sound travels at a speed of approximately 343 meters per second at 20°C. Therefore, to calculate the time it takes for the sound to reach you, divide the distance by the speed:

Time = 16,090 meters / 343 meters per second

Time = 46.97 seconds

So, it takes approximately 47 seconds for the sound of thunder to reach you at 20°C temperature.

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Which of the following could be a potential safety hazard of indoor recreation?a. slippery rocks and loose gravel
b. flash floods
c. traveling without a compass, map, or GPS
d. a liquid spill on the floor that was not cleaned

Answers

d. a liquid spill on the floor that was not cleaned could be a potential safety hazard of indoor recreation

A liquid spill on the floor that was not cleaned could be a potential safety hazard of indoor recreation.

NOT:

a. slippery rocks and loose gravel
b. flash floods
c. traveling without a compass, map, or GPS

Answer:

THE ANSWER IS D

Explanation:

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