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kvasek [131]
3 years ago
10

7. Two bikes travelling in the same direction move at a speed of 30 km/hr. The bikes are separated by a distance of 5 km. What w

ould the speed of the car travelling in the opposite direction be if it meets these bikes at an interval of 4 minutes?
Physics
1 answer:
Fantom [35]3 years ago
6 0

Answer:

Explanation:

Call the bike on the right A

Call the bike on the left B

The car begins it's time when it passes A

4 minutes later, it passes B.

But B has moved in 4 minutes and that is the key to the problem.

How far has B moved.

t = 4 minutes = 4/60 hours = 1/15 of an hour.

d = ?

rate = 30 km / hr

d = r * t

d = 30 km/hr * 1/15 hours = 2 km

The distance between the bikes is 5 km.

So the car has traveled 5 - 2 = 3 km

d = 3 km

r = ?

t = 4 minutes = 1/15 hour

r = d/t = 3/(1/15)= 3 / 0.066666666  = 45 km/hr.

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Rama09 [41]

1. The light phenomena happen due to the refraction of light upon hitting the small crystals that make up cirrus or cirrostratus clouds is called Sundogs.

2.A light phenomena which are formed when light passes through clouds and strikes the ice crystals in them is called Halos.

3.A light phenomenon formed from the combination of several light properties like refraction, reflection, and dispersion is Rainbow.

4.  Rainbow are created after a rain shower and Sun light.

5. A visible accumulations of tiny water droplets or ice crystals.

in the Earth’s atmosphere are called Clouds.

6. There are seven colors in a rainbow.

7. The kind of rainbows are formed when light strikes small raindrops with almost the same size are Supernumerary rainbows.

8.The kind of rainbows are formed when two inner reflections are done instead of one; this causes the reversal of colors in a secondary rainbow in comparison to a primary rainbow are Secondary rainbows.

9. A reflective surface that is curved inward and away from the light source is concave mirror.

10. The kind of mirror are curved outward like the bottom

of a spoon is convex mirror.

<h3>What is reflection?</h3>

When a light strikes on a shiny surface, it reflects back the light ray in the same medium. The phenomenon is called reflection and the ray is called the reflected ray.

Thus, all the questions are answered.

Learn more about reflection.

brainly.com/question/2254222

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8 0
1 year ago
Why is Vy negative and not positive because I solved it and it resulted in a positive number?
11Alexandr11 [23.1K]

Explanation:

You are given the initial velocity, the displacement, and the acceleration.  You're looking for the final velocity.  So you use the equation:

v² = v₀² + 2aΔy

When you solve for v, you take the square root.  Your calculator will return a positive answer, but there are actually two possible answers: positive and negative.

v = ±√(v₀² + 2aΔy)

You must use the physical context of the problem.  If we take up to be the positive direction, then v must be negative, since the projectile is moving down.

8 0
2 years ago
Nine-year-old Dakoda realizes that the quantity of water in a glass remains the same, even when the water is poured into a diffe
Archy [21]

Answer:

Conservation

Explanation:

She has observation conservation because If the temperature of the liquids stays constant and the container is insulated and not heat or cool the liquid much would not change the density of the liquid very much so that it's original volume could remain constant.

The interesting thing is not that the child assumes the taller glass holds more liquid but that they fail to understand conservation: the fact that the water from one glass is going to be the same amount after being poured into any other container. It's as if they did not realize the water came from the same glass.

3 0
3 years ago
As the Sun moves throughout the day, some plants can follow it. This is called _____.
Viefleur [7K]

Answer:As the Sun moves throughout the day, some plants can follow it. This is called <u><em>solar tracking.</em></u>

Explanation:

There are flower which tracks the position sun are called heliotropism or solar tracking. flowers.These are the flower which face their bloom side towards the sun to maximize the photosynthesis.The most common example of this is Sun flower.

6 0
2 years ago
Which of the following represents a joule?
Andru [333]

Answer:

d. N*m

Explanation:

Workdone which is measured in Joules is calculated using the formula;

Workdone = force * distance

Where;

Force is measured in Newton

Distance is measured in meters.

Therefore, workdone also has the measurement of Newton-meters.

5 0
3 years ago
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